diff --git a/2017/d01/ex1/ex1.py b/2017/d01/ex1/ex1.py
new file mode 100755
index 0000000..7d20719
--- /dev/null
+++ b/2017/d01/ex1/ex1.py
@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    nums = [int(n) for n in input.strip()]
+    return sum(n for n, m in zip(nums, nums[1:] + nums[:1]) if n == m)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d01/ex1/input b/2017/d01/ex1/input
new file mode 100644
index 0000000..1c58802
--- /dev/null
+++ b/2017/d01/ex1/input
@@ -0,0 +1 @@
+5255443714755555317777152441826784321918285999594221531636242944998363716119294845838579943562543247239969555791772392681567883449837982119239536325341263524415397123824358467891963762948723327774545715851542429832119179139914471523515332247317441719184556891362179267368325486642376685657759623876854958721636574219871249645773738597751429959437466876166273755524873351452951411628479352522367714269718514838933283861425982562854845471512652555633922878128558926123935941858532446378815929573452775348599693982834699757734714187831337546474515678577158721751921562145591166634279699299418269158557557996583881642468274618196335267342897498486869925262896125146867124596587989531495891646681528259624674792728146526849711139146268799436334618974547539561587581268886449291817335232859391493839167111246376493191985145848531829344198536568987996894226585837348372958959535969651573516542581144462536574953764413723147957237298324458181291167587791714172674717898567269547766636143732438694473231473258452166457194797819423528139157452148236943283374193561963393846385622218535952591588353565319432285579711881559343544515461962846879685879431767963975654347569385354482226341261768547328749947163864645168428953445396361398873536434931823635522467754782422557998262858297563862492652464526366171218276176258582444923497181776129436396397333976215976731542182878979389362297155819461685361676414725597335759976285597713332688275241271664658286868697167515329811831234324698345159949135474463624749624626518247831448143876183133814263977611564339865466321244399177464822649611969896344874381978986453566979762911155931362394192663943526834148596342268321563885255765614418141828934971927998994739769141789185165461976425151855846739959338649499379657223196885539386154935586794548365861759354865453211721551776997576289811595654171672259129335243531518228282393326395241242185795828261319215164262237957743232558971289145639852148197184265766291885259847236646615935963759631145338159257538114359781854685695429348428884248972177278361353814766653996675994784195827214295462389532422825696456457332417366426619555
diff --git a/2017/d01/ex2/ex2.py b/2017/d01/ex2/ex2.py
new file mode 100755
index 0000000..e3596b2
--- /dev/null
+++ b/2017/d01/ex2/ex2.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    nums = [int(n) for n in input.strip()]
+    half = len(nums) // 2
+    return sum(n for n, m in zip(nums, nums[half:] + nums[:half]) if n == m)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d01/ex2/input b/2017/d01/ex2/input
new file mode 100644
index 0000000..1c58802
--- /dev/null
+++ b/2017/d01/ex2/input
@@ -0,0 +1 @@
+5255443714755555317777152441826784321918285999594221531636242944998363716119294845838579943562543247239969555791772392681567883449837982119239536325341263524415397123824358467891963762948723327774545715851542429832119179139914471523515332247317441719184556891362179267368325486642376685657759623876854958721636574219871249645773738597751429959437466876166273755524873351452951411628479352522367714269718514838933283861425982562854845471512652555633922878128558926123935941858532446378815929573452775348599693982834699757734714187831337546474515678577158721751921562145591166634279699299418269158557557996583881642468274618196335267342897498486869925262896125146867124596587989531495891646681528259624674792728146526849711139146268799436334618974547539561587581268886449291817335232859391493839167111246376493191985145848531829344198536568987996894226585837348372958959535969651573516542581144462536574953764413723147957237298324458181291167587791714172674717898567269547766636143732438694473231473258452166457194797819423528139157452148236943283374193561963393846385622218535952591588353565319432285579711881559343544515461962846879685879431767963975654347569385354482226341261768547328749947163864645168428953445396361398873536434931823635522467754782422557998262858297563862492652464526366171218276176258582444923497181776129436396397333976215976731542182878979389362297155819461685361676414725597335759976285597713332688275241271664658286868697167515329811831234324698345159949135474463624749624626518247831448143876183133814263977611564339865466321244399177464822649611969896344874381978986453566979762911155931362394192663943526834148596342268321563885255765614418141828934971927998994739769141789185165461976425151855846739959338649499379657223196885539386154935586794548365861759354865453211721551776997576289811595654171672259129335243531518228282393326395241242185795828261319215164262237957743232558971289145639852148197184265766291885259847236646615935963759631145338159257538114359781854685695429348428884248972177278361353814766653996675994784195827214295462389532422825696456457332417366426619555
diff --git a/2017/d02/ex1/ex1.py b/2017/d02/ex1/ex1.py
new file mode 100755
index 0000000..01e3a88
--- /dev/null
+++ b/2017/d02/ex1/ex1.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[list[int]]:
+        return [[int(n) for n in line.split()] for line in input.splitlines()]
+
+    def checksum(row: list[int]) -> int:
+        return max(row) - min(row)
+
+    sheet = parse(input)
+    return sum(map(checksum, sheet))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d02/ex1/input b/2017/d02/ex1/input
new file mode 100644
index 0000000..1dd09df
--- /dev/null
+++ b/2017/d02/ex1/input
@@ -0,0 +1,16 @@
+5048	177	5280	5058	4504	3805	5735	220	4362	1809	1521	230	772	1088	178	1794
+6629	3839	258	4473	5961	6539	6870	4140	4638	387	7464	229	4173	5706	185	271
+5149	2892	5854	2000	256	3995	5250	249	3916	184	2497	210	4601	3955	1110	5340
+153	468	550	126	495	142	385	144	165	188	609	182	439	545	608	319
+1123	104	567	1098	286	665	1261	107	227	942	1222	128	1001	122	69	139
+111	1998	1148	91	1355	90	202	1522	1496	1362	1728	109	2287	918	2217	1138
+426	372	489	226	344	431	67	124	120	386	348	153	242	133	112	369
+1574	265	144	2490	163	749	3409	3086	154	151	133	990	1002	3168	588	2998
+173	192	2269	760	1630	215	966	2692	3855	3550	468	4098	3071	162	329	3648
+1984	300	163	5616	4862	586	4884	239	1839	169	5514	4226	5551	3700	216	5912
+1749	2062	194	1045	2685	156	3257	1319	3199	2775	211	213	1221	198	2864	2982
+273	977	89	198	85	1025	1157	1125	69	94	919	103	1299	998	809	478
+1965	6989	230	2025	6290	2901	192	215	4782	6041	6672	7070	7104	207	7451	5071
+1261	77	1417	1053	2072	641	74	86	91	1878	1944	2292	1446	689	2315	1379
+296	306	1953	3538	248	1579	4326	2178	5021	2529	794	5391	4712	3734	261	4362
+2426	192	1764	288	4431	2396	2336	854	2157	216	4392	3972	229	244	4289	1902
diff --git a/2017/d02/ex2/ex2.py b/2017/d02/ex2/ex2.py
new file mode 100755
index 0000000..779ac63
--- /dev/null
+++ b/2017/d02/ex2/ex2.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[list[int]]:
+        return [[int(n) for n in line.split()] for line in input.splitlines()]
+
+    def evenly_divide(row: list[int]) -> int:
+        for a, b in itertools.combinations(sorted(row), 2):
+            assert a <= b  # Sanity check
+            if b % a:
+                continue
+            return b // a
+        assert False  # Sanity check
+
+    sheet = parse(input)
+    return sum(map(evenly_divide, sheet))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d02/ex2/input b/2017/d02/ex2/input
new file mode 100644
index 0000000..1dd09df
--- /dev/null
+++ b/2017/d02/ex2/input
@@ -0,0 +1,16 @@
+5048	177	5280	5058	4504	3805	5735	220	4362	1809	1521	230	772	1088	178	1794
+6629	3839	258	4473	5961	6539	6870	4140	4638	387	7464	229	4173	5706	185	271
+5149	2892	5854	2000	256	3995	5250	249	3916	184	2497	210	4601	3955	1110	5340
+153	468	550	126	495	142	385	144	165	188	609	182	439	545	608	319
+1123	104	567	1098	286	665	1261	107	227	942	1222	128	1001	122	69	139
+111	1998	1148	91	1355	90	202	1522	1496	1362	1728	109	2287	918	2217	1138
+426	372	489	226	344	431	67	124	120	386	348	153	242	133	112	369
+1574	265	144	2490	163	749	3409	3086	154	151	133	990	1002	3168	588	2998
+173	192	2269	760	1630	215	966	2692	3855	3550	468	4098	3071	162	329	3648
+1984	300	163	5616	4862	586	4884	239	1839	169	5514	4226	5551	3700	216	5912
+1749	2062	194	1045	2685	156	3257	1319	3199	2775	211	213	1221	198	2864	2982
+273	977	89	198	85	1025	1157	1125	69	94	919	103	1299	998	809	478
+1965	6989	230	2025	6290	2901	192	215	4782	6041	6672	7070	7104	207	7451	5071
+1261	77	1417	1053	2072	641	74	86	91	1878	1944	2292	1446	689	2315	1379
+296	306	1953	3538	248	1579	4326	2178	5021	2529	794	5391	4712	3734	261	4362
+2426	192	1764	288	4431	2396	2336	854	2157	216	4392	3972	229	244	4289	1902
diff --git a/2017/d03/ex1/ex1.py b/2017/d03/ex1/ex1.py
new file mode 100755
index 0000000..64f7dbb
--- /dev/null
+++ b/2017/d03/ex1/ex1.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+def solve(input: str) -> int:
+    def target_coord(target: int) -> Point:
+        for dist in itertools.count():
+            side = dist * 2 + 1
+            bot_right = side * side
+            if bot_right < target:
+                continue
+            # Target must be in the last loop, before bot_right
+            bot_left = bot_right - side + 1
+            top_left = bot_left - side + 1
+            top_right = top_left - side + 1
+            if bot_left <= target <= bot_right:
+                return Point(dist - (bot_right - target), -dist)
+            if top_left <= target <= bot_left:
+                return Point(-dist, -dist + (bot_left - target))
+            if top_right <= target <= top_left:
+                return Point(-dist + (top_left - target), dist)
+            if target <= top_right:
+                return Point(dist, dist - (top_right - target))
+            assert False  # Sanity check
+        assert False  # Sanity check
+
+    target = int(input)
+    coord = target_coord(target)
+    return abs(coord.x) + abs(coord.y)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d03/ex1/input b/2017/d03/ex1/input
new file mode 100644
index 0000000..63320e1
--- /dev/null
+++ b/2017/d03/ex1/input
@@ -0,0 +1 @@
+347991
diff --git a/2017/d03/ex2/ex2.py b/2017/d03/ex2/ex2.py
new file mode 100755
index 0000000..e6ca8c5
--- /dev/null
+++ b/2017/d03/ex2/ex2.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+    def neighbours(self) -> Iterator["Point"]:
+        for dx, dy in itertools.product((-1, 0, 1), repeat=2):
+            if dx == 0 and dy == 0:
+                continue
+            yield Point(self.x + dx, self.y + dy)
+
+
+def solve(input: str) -> int:
+    def spiral() -> Iterator[Point]:
+        yield Point(0, 0)
+        for dist in itertools.count(1):
+            side = dist * 2 + 1
+            for start, dx, dy in (
+                (Point(dist, -dist), 0, 1),
+                (Point(dist, dist), -1, 0),
+                (Point(-dist, dist), 0, -1),
+                (Point(-dist, -dist), 1, 0),
+            ):
+                # We need a non-zero step for `range`, and to make it inclusive
+                stepx = dx if dx != 0 else 1
+                stepy = dy if dy != 0 else 1
+                # Don't include the corner, which was already output in previous loop
+                # Hence, `side - 1` points in the range
+                xs = range(start.x + dx, start.x + (side - 1) * dx + stepx, stepx)
+                ys = range(start.y + dy, start.y + (side - 1) * dy + stepy, stepy)
+                yield from (Point(x, y) for x, y in itertools.product(xs, ys))
+
+    target = int(input)
+    values = {Point(0, 0): 1}
+    # Skip the origin, which we already know
+    for p in itertools.islice(spiral(), 1, None):
+        if (res := sum(values.get(n, 0) for n in p.neighbours())) > target:
+            return res
+        values[p] = res
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d03/ex2/input b/2017/d03/ex2/input
new file mode 100644
index 0000000..63320e1
--- /dev/null
+++ b/2017/d03/ex2/input
@@ -0,0 +1 @@
+347991
diff --git a/2017/d04/ex1/ex1.py b/2017/d04/ex1/ex1.py
new file mode 100755
index 0000000..3904182
--- /dev/null
+++ b/2017/d04/ex1/ex1.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[list[str]]:
+        return [line.split() for line in input.splitlines()]
+
+    def validate_passphrase(passphrase: list[str]) -> bool:
+        return len(set(passphrase)) == len(passphrase)
+
+    passphrases = parse(input)
+    return sum(map(validate_passphrase, passphrases))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d04/ex1/input b/2017/d04/ex1/input
new file mode 100644
index 0000000..b7384b6
--- /dev/null
+++ b/2017/d04/ex1/input
@@ -0,0 +1,512 @@
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diff --git a/2017/d04/ex2/ex2.py b/2017/d04/ex2/ex2.py
new file mode 100755
index 0000000..6279f97
--- /dev/null
+++ b/2017/d04/ex2/ex2.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[list[str]]:
+        return [line.split() for line in input.splitlines()]
+
+    def validate_passphrase(passphrase: list[str]) -> bool:
+        return len(set("".join(sorted(w)) for w in passphrase)) == len(passphrase)
+
+    passphrases = parse(input)
+    return sum(map(validate_passphrase, passphrases))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d04/ex2/input b/2017/d04/ex2/input
new file mode 100644
index 0000000..b7384b6
--- /dev/null
+++ b/2017/d04/ex2/input
@@ -0,0 +1,512 @@
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diff --git a/2017/d05/ex1/ex1.py b/2017/d05/ex1/ex1.py
new file mode 100755
index 0000000..7a09715
--- /dev/null
+++ b/2017/d05/ex1/ex1.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[int]:
+        return [int(n) for n in input.splitlines()]
+
+    instructions = parse(input)
+    offset = 0
+    for i in itertools.count():
+        if offset < 0 or offset >= len(instructions):
+            return i
+        instructions[offset] += 1
+        offset += instructions[offset] - 1  # Account for previous increment
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d05/ex1/input b/2017/d05/ex1/input
new file mode 100644
index 0000000..c584877
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diff --git a/2017/d05/ex2/ex2.py b/2017/d05/ex2/ex2.py
new file mode 100755
index 0000000..10f1f4d
--- /dev/null
+++ b/2017/d05/ex2/ex2.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[int]:
+        return [int(n) for n in input.splitlines()]
+
+    instructions = parse(input)
+    offset = 0
+    for i in itertools.count():
+        if offset < 0 or offset >= len(instructions):
+            return i
+        delta = -1 if instructions[offset] >= 3 else 1
+        instructions[offset] += delta
+        offset += instructions[offset] - delta  # Account for previous increment
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d05/ex2/input b/2017/d05/ex2/input
new file mode 100644
index 0000000..c584877
--- /dev/null
+++ b/2017/d05/ex2/input
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diff --git a/2017/d06/ex1/ex1.py b/2017/d06/ex1/ex1.py
new file mode 100755
index 0000000..e729e49
--- /dev/null
+++ b/2017/d06/ex1/ex1.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+MemoryBlocks = tuple[int, ...]
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> MemoryBlocks:
+        return tuple(int(n) for n in input.split())
+
+    def redistribute(nums: MemoryBlocks) -> MemoryBlocks:
+        res = list(nums)
+        i = res.index(max(res))  # Quick and hasty `argmax`
+        n, res[i] = res[i], 0
+        common, remain = n // len(res), n % len(res)
+        for j in range(i + 1, i + remain + 1):
+            res[j % len(res)] += 1
+        for j in range(len(res)):
+            res[j] += common
+        return tuple(res)
+
+    blocks = parse(input)
+    seen: set[MemoryBlocks] = set()
+    for i in itertools.count():
+        if blocks in seen:
+            return i
+        seen.add(blocks)
+        blocks = redistribute(blocks)
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d06/ex1/input b/2017/d06/ex1/input
new file mode 100644
index 0000000..d369702
--- /dev/null
+++ b/2017/d06/ex1/input
@@ -0,0 +1 @@
+2	8	8	5	4	2	3	1	5	5	1	2	15	13	5	14
diff --git a/2017/d06/ex2/ex2.py b/2017/d06/ex2/ex2.py
new file mode 100755
index 0000000..a7ad7d8
--- /dev/null
+++ b/2017/d06/ex2/ex2.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+MemoryBlocks = tuple[int, ...]
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> MemoryBlocks:
+        return tuple(int(n) for n in input.split())
+
+    def redistribute(nums: MemoryBlocks) -> MemoryBlocks:
+        res = list(nums)
+        i = res.index(max(res))  # Quick and hasty `argmax`
+        n, res[i] = res[i], 0
+        common, remain = n // len(res), n % len(res)
+        for j in range(i + 1, i + remain + 1):
+            res[j % len(res)] += 1
+        for j in range(len(res)):
+            res[j] += common
+        return tuple(res)
+
+    blocks = parse(input)
+    count: dict[MemoryBlocks, int] = {}
+    for i in itertools.count():
+        if blocks in count:
+            return i - count[blocks]
+        count[blocks] = i
+        blocks = redistribute(blocks)
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d06/ex2/input b/2017/d06/ex2/input
new file mode 100644
index 0000000..d369702
--- /dev/null
+++ b/2017/d06/ex2/input
@@ -0,0 +1 @@
+2	8	8	5	4	2	3	1	5	5	1	2	15	13	5	14
diff --git a/2017/d07/ex1/ex1.py b/2017/d07/ex1/ex1.py
new file mode 100755
index 0000000..a859fa6
--- /dev/null
+++ b/2017/d07/ex1/ex1.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class ProgramYell(NamedTuple):
+    weight: int
+    children: set[str]
+
+
+Tower = dict[str, ProgramYell]
+
+
+def solve(input: str) -> str:
+    def parse_line(line: str) -> tuple[str, ProgramYell]:
+        name, rest = line.split(" ", 1)
+        weight, rest = rest.split(")")
+        children = set(rest.removeprefix(" -> ").split(", ")) if rest else set()
+        return name, ProgramYell(int(weight[1:]), children)
+
+    def parse(input: str) -> Tower:
+        return {name: yell for name, yell in map(parse_line, input.splitlines())}
+
+    def find_base(tower: Tower) -> str:
+        candidates = set(tower.keys())
+        for yell in tower.values():
+            candidates -= yell.children
+        assert len(candidates) == 1
+        return candidates.pop()
+
+    tower = parse(input)
+    return find_base(tower)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d07/ex1/input b/2017/d07/ex1/input
new file mode 100644
index 0000000..cd0fc4a
--- /dev/null
+++ b/2017/d07/ex1/input
@@ -0,0 +1,1241 @@
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+yjwvnhl (219)
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+rdzsisf (59)
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+aqxaecv (297)
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+fqsjaz (10)
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+koxzeku (79)
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+mbwaxn (240) -> nachvlp, prcxksh
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+psetts (80)
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+niifkl (90)
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+aditjen (7)
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+nvigovl (98)
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+mjqzvuu (195) -> hvwyae, tmzxl
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+psjec (97)
+xyxidwf (24)
+esized (69)
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+ltytvpb (90)
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+vqinar (2904) -> qhbrmur, nrgxdmx, angpy, gcswiam
+yxbaldn (122) -> vxiwms, syvza
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+oiuztx (92)
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+ffzzzc (67)
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+buznuv (26)
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+hiuviy (59)
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+oxlzlor (16)
+bvejguc (68)
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+owukmji (195)
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+agztuz (53)
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+zfqmic (67) -> lkuwf, pkipy
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+fioegdo (140) -> opzxu, blyms
+bgnfpcr (75)
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+sbmwazv (39) -> arrvxtj, hawhqex
+xqwfgy (1496) -> cywvxf, bjbndbg, mlvhqpe
+jfqddfd (64) -> ewgadin, fyxttac, gvtcy
+empixc (142) -> hlwesdc, xjcxk, fmhfnhv
+zmdkea (154) -> bgnfpcr, hgkmod
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+rteyxil (334)
+clqfbvi (66)
+lfdery (33)
+ijtis (85)
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+kptdem (97)
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+idokb (95)
+kynezb (79)
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+athuly (98)
+vazoq (248)
+rxcgwd (38)
+tfezflv (95)
+cywvxf (279) -> greav, kybtla
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+vvzmdr (18)
+gwuixj (31)
+svtqdbd (61)
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+lxzvkpk (458)
+gewpohj (16410) -> cvqbwem, uzljl, zlhpt, vtcxw, iffluz
+bggovyb (144) -> supjxi, mieynp, wltax, pyhof
+pbdafpz (236) -> wjdeth, zacwh, mxpgmte, wjgjhc
+pqrpkmd (34)
+maftysp (53)
+qqqbf (52)
+fpeiss (76)
+qsstg (57)
+oqeam (128) -> qjzss, gwuixj
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+icush (877) -> rsfxf, zfqmic, axzszf, gzwrv, cujuai
+jagajrh (93)
+kejph (98) -> alneot, jjiikvt
+acvzsbe (37)
+gqvmeg (52)
+olebdv (65)
+tqtut (74) -> ykitsi, wxvjyn
+tzngdx (486) -> pvyrkg, hppxlu, eovobtl, diqdy
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+qiznqk (77)
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+ycuuwxa (161) -> vehziv, rvqopbu
+mieqogh (19)
+xadcuw (1626) -> chgfb, stofi
+supjxi (21)
+rfqddq (53)
+qbaosu (314) -> hshafy, ukgbdva
+ptxfk (73)
+lofybs (89)
+agjpn (8265) -> ocgbpez, ejdxula, kgbzu
+mgbgb (334) -> kksizqf, dofou
+izxpf (39) -> ewobo, ntezb, sbmqxu, tlpfggk
+znagag (89)
+zmciyk (19) -> mieuhe, psjec
+dhobx (95)
+hvecp (90) -> hrrld, jazqb, fonrb, dcpzwz, vqinar, bxqqvue
+sjbfmfa (80) -> fewgct, jupzgjm
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diff --git a/2017/d07/ex2/ex2.py b/2017/d07/ex2/ex2.py
new file mode 100755
index 0000000..c3e2db9
--- /dev/null
+++ b/2017/d07/ex2/ex2.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+import sys
+from collections import Counter
+from typing import NamedTuple
+
+
+class ProgramYell(NamedTuple):
+    weight: int
+    children: set[str]
+
+
+Tower = dict[str, ProgramYell]
+
+
+def solve(input: str) -> int:
+    def parse_line(line: str) -> tuple[str, ProgramYell]:
+        name, rest = line.split(" ", 1)
+        weight, rest = rest.split(")")
+        children = set(rest.removeprefix(" -> ").split(", ")) if rest else set()
+        return name, ProgramYell(int(weight[1:]), children)
+
+    def parse(input: str) -> Tower:
+        return {name: yell for name, yell in map(parse_line, input.splitlines())}
+
+    def find_base(tower: Tower) -> str:
+        candidates = set(tower.keys())
+        for yell in tower.values():
+            candidates -= yell.children
+        assert len(candidates) == 1
+        return candidates.pop()
+
+    def compute_weights(tower: Tower, base: str) -> dict[str, int]:
+        def helper(base: str) -> int:
+            total = (
+                sum(helper(child) for child in tower[base].children)
+                + tower[base].weight
+            )
+            res[base] = total
+            return total
+
+        res: dict[str, int] = {}
+        helper(base)
+        return res
+
+    def fix_balance(tower: Tower) -> int:
+        base = find_base(tower)
+        weights = compute_weights(tower, base)
+
+        balanced_weight = -1  # Will be updated to the correct value afterwards
+        while True:
+            children = tower[base].children
+            subtowers = Counter(weights[child] for child in children)
+            if len(subtowers) == 1:
+                assert balanced_weight != -1  # Sanity check
+                return balanced_weight - sum(weights[child] for child in children)
+            assert len(subtowers) == 2  # Sanity check
+            balanced_weight, unbalanced_weight = (v for v, _ in subtowers.most_common())
+            base = next(
+                child for child in children if weights[child] == unbalanced_weight
+            )
+
+    tower = parse(input)
+    return fix_balance(tower)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d07/ex2/input b/2017/d07/ex2/input
new file mode 100644
index 0000000..cd0fc4a
--- /dev/null
+++ b/2017/d07/ex2/input
@@ -0,0 +1,1241 @@
+bqyqwn (68) -> wscqe, cwxspl, syogw, xnxudsh
+ddswb (34)
+hnkvw (320)
+ibqmynm (252) -> oglcdgs, tkjofj, upurae, oypvhy, bzfkt, hdvcz, cfwxyl
+rkerea (87)
+lcmlbj (66)
+vtccvv (69)
+nachvlp (20)
+tmkli (66)
+exuyuk (82)
+ojzogs (79)
+egkiqcp (37) -> rxjnad, psetts
+xadjes (10)
+fivkqxx (121) -> acvzsbe, kkmax, qcmwsvm
+krgtrdn (53)
+mxemqqb (267) -> iuuouds, qqmvd
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+vtokttx (55)
+boalcdm (13)
+angpy (62) -> fitha, itxgz, pyiexlj, wqshh, rloxobx
+gwcdf (32)
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+rusndcc (39) -> xcfxvd, kvylxr, vwkegak, oiuztx
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+bujufb (148) -> tduxvx, lxzvkpk, jllqymn, csrpy
+cwfydbh (369) -> qcmtgvr, tyvjs
+cjjytkr (305) -> trszl, fgzgfc
+qsakd (82)
+domway (2464) -> kgphv, pjujovx, hrdggo
+mrpji (61)
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+hocazx (818) -> bmukspb, mgbwxw, gyirkcj, kgxfc
+bobvssz (25) -> srvqt, alhghui, wnjaw, qhlhfk, lsbvzaf, qjkfys, nnncfl
+rrzyzq (76)
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+tduix (18)
+yzcez (62) -> rlxto, vkaxa
+uvpuko (91)
+xtnmps (95) -> ptatzl, bujufb, oybbzr, zwopz, phqpwkw
+ibeis (54)
+ofkvpq (500) -> auvuxv, stqmwk, dptekr
+pmolg (166) -> uuunqk, uolqt
+byedxex (180) -> gsaqlad, ebwubc
+aicjff (67)
+vtcxw (860) -> ezlfnhs, aizdt, ylbftp
+nzuswm (80) -> ojzogs, qfopwo
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+xukfcd (28)
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+niifkl (90)
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+efqjc (15)
+efvqwzi (7)
+epqowm (45)
+fjdlcbh (139)
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+zrnlkl (63) -> dyfzj, xviqup, atrzkqf, ulbute
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+cdfmatu (80)
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+cdjxwb (99) -> buznuv, hkltivy
+aditjen (7)
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+nvigovl (98)
+yeyxf (16)
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+jaasf (95)
+dwrtbo (87)
+hwgwzv (57) -> qqqbf, fnslg
+alhghui (279) -> qbhhtw, ltytvpb
+mjqzvuu (195) -> hvwyae, tmzxl
+wzczb (61)
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+gozhrsf (762) -> ifxzdfy, uuxpvxf, zyqssjb
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+psjec (97)
+xyxidwf (24)
+esized (69)
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+ltytvpb (90)
+msdcz (24)
+csdap (27)
+vqinar (2904) -> qhbrmur, nrgxdmx, angpy, gcswiam
+yxbaldn (122) -> vxiwms, syvza
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+mflijpx (75) -> oxypy, rtwlo, vwnvlh
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+alneot (25)
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+fjticim (35)
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+oozbxqb (92)
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+amklj (23)
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+qsrxouy (96)
+rauho (72)
+tzrqwt (77)
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+hzuyh (50)
+oiuztx (92)
+wjdeth (5)
+bjops (18)
+bwvlnlt (38)
+baedi (89)
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+zvtfm (41)
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+ffzzzc (67)
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+foznw (146) -> dpngy, wgsgaj, xboqv
+buznuv (26)
+tduxvx (326) -> iktget, vylzag, picnycy, lfdery
+hiuviy (59)
+dtazpb (85)
+oxlzlor (16)
+bvejguc (68)
+uwjkolt (52) -> tvxvtce, igdkn, rteyxil, qvxanzu, qllime
+rvqopbu (67)
+owukmji (195)
+pbzvjg (77)
+agztuz (53)
+zpaivc (19)
+nofpmh (290) -> efvqwzi, pmdcajx
+mhnnmp (8) -> qbaosu, pjndde, anamgt, bcesxba, blkewbk
+zfqmic (67) -> lkuwf, pkipy
+tespoy (5) -> bdlnohy, jppbvbo, fgsmzi, sjmhuxn
+qhbrmur (1450) -> kcfgbv, dyomhm, nofpmh
+lkdyq (57)
+fuaio (16)
+ccxff (53) -> cgveph, tzbmy
+fioegdo (140) -> opzxu, blyms
+bgnfpcr (75)
+bmukspb (106) -> jzoxv, gqvmeg
+sbmwazv (39) -> arrvxtj, hawhqex
+xqwfgy (1496) -> cywvxf, bjbndbg, mlvhqpe
+jfqddfd (64) -> ewgadin, fyxttac, gvtcy
+empixc (142) -> hlwesdc, xjcxk, fmhfnhv
+zmdkea (154) -> bgnfpcr, hgkmod
+jeadxth (22)
+ucilvib (40) -> ddgnyfo, koxzeku
+rteyxil (334)
+clqfbvi (66)
+lfdery (33)
+ijtis (85)
+rmshk (24)
+kptdem (97)
+ropdc (226) -> usevjww, agthzo
+talptwp (77)
+bzqjb (61)
+idokb (95)
+kynezb (79)
+tvxvtce (52) -> ujgeml, jpmrs, lpsaav
+athuly (98)
+vazoq (248)
+rxcgwd (38)
+tfezflv (95)
+cywvxf (279) -> greav, kybtla
+lfliwg (65)
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+vvzmdr (18)
+gwuixj (31)
+svtqdbd (61)
+nqfqgj (22) -> niifkl, fosdh
+lxzvkpk (458)
+gewpohj (16410) -> cvqbwem, uzljl, zlhpt, vtcxw, iffluz
+bggovyb (144) -> supjxi, mieynp, wltax, pyhof
+pbdafpz (236) -> wjdeth, zacwh, mxpgmte, wjgjhc
+pqrpkmd (34)
+maftysp (53)
+qqqbf (52)
+fpeiss (76)
+qsstg (57)
+oqeam (128) -> qjzss, gwuixj
+brvxyyg (30)
+oqmxlu (39)
+tlpfhx (147) -> heisrl, hskhxx
+icush (877) -> rsfxf, zfqmic, axzszf, gzwrv, cujuai
+jagajrh (93)
+kejph (98) -> alneot, jjiikvt
+acvzsbe (37)
+gqvmeg (52)
+olebdv (65)
+tqtut (74) -> ykitsi, wxvjyn
+tzngdx (486) -> pvyrkg, hppxlu, eovobtl, diqdy
+vmsoc (61) -> euvrdg, dcriqom
+qiznqk (77)
+kspsz (112) -> tduix, aqacmr
+kybtla (20)
+ktjdpt (23) -> tdmirp, qhpvuzi
+jmvcgo (88)
+hjzkjuw (76)
+qinne (35)
+ypqkl (64) -> qjeuqe, wowxv
+epcjds (26)
+mrxdp (22)
+pznkdcr (67)
+kmvvxon (16)
+xlaqpg (81)
+nhtfal (23)
+bxqqvue (5668) -> zqbpucs, mhnnmp, ewqcktv
+ipnvjje (80)
+noibcw (95)
+pywtg (16)
+omslcm (34)
+sxdngcn (6)
+insleik (209)
+wxvjyn (63)
+ntezb (25)
+klkwsa (57)
+figvamv (32)
+phqpwkw (1192) -> egkiqcp, ecjxs, foznw, tokyi
+onjqcrh (67) -> lkdyq, tptqtpq, dmidur, klkwsa
+igytdcp (160) -> vtdbov, dporud
+vrtgae (66)
+bwgimi (242) -> eohjrft, ankrgg, kvvkbhi
+bzjxil (23)
+ankrgg (55)
+okurp (5)
+rndvcf (39)
+rkgoovn (104) -> qyfsc, lytrpo
+thftfut (61)
+jduij (65)
+invra (180) -> sxdngcn, mahlbe, swgjx
+wkkmvcn (7)
+igcmpn (55) -> bcadp, sxjlr
+pgaiut (90) -> vtccvv, mgcnohi
+iytvm (15) -> juoaena, qebqgxd, uwxge
+glrmew (67)
+uqmaluk (70)
+qstlv (75) -> qmcphv, bpguivk
+gtbgp (234) -> ilsgqdw, qakiz, zesfmu
+rziopi (57) -> flgpg, nqjydpi, xbnmg, xxdcgas, vhzfut, sfwzqk, kirnt
+rdorrx (56)
+oxypy (1992) -> sflonq, igytdcp, nzcqte, sjbfmfa
+pekohn (65)
+praagwp (30)
+qqooh (15)
+nzawh (22)
+ywwxi (49)
+phnuqn (44)
+ylnobx (5204) -> rziopi, mzutqi, lcitl
+gumncu (24)
+cjgtra (900) -> nfkfex, rhqfb, oyyctv
+gjgrhw (94)
+paeel (87)
+xiqthw (87)
+ogowst (176) -> pdzooh, xlccnkv
+mevujmj (83)
+tlqjsb (994) -> odxpup, znagag, obmcr
+ejoxsy (38) -> lxwkpqh, zdelqb, xyang, gtbgp, onzind, wabzx, kzjtb
+agthzo (15)
+xyvnk (32)
+crchwpb (36)
+pjoqde (76)
+fgcajp (50)
+tefdmi (44)
+xctuhbx (72)
+tokyi (79) -> yapfoe, yyecrv
+njxrb (60)
+qotyaq (7)
+dnbejx (70)
+uhrdeol (171) -> qinne, opskc, zxmwy, dgqfrv
+cwxspl (12) -> nnciip, hbbpp
+nggubzz (84)
+uuunqk (9)
+lxttas (133)
+xvdmeo (7)
+gkkit (84)
+wexncjl (295)
+jgsmitm (173)
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+ruedk (146) -> kgwftu, xlacmu
+ydpemw (3192) -> ymkgx, nhtfal
+ibqrz (96)
+oyyctv (34) -> ipnvjje, tvbgr
+xfcktep (13)
+jblwph (81) -> lxexhp, vbqpp
+steez (38)
+xnxudsh (78) -> pjlxc, nfywcyp
+rxjly (133) -> rftuf, hzehjo
+eteyvz (23)
+eohjrft (55)
+wqilo (32)
+tbmyue (54)
+nkwwia (1405) -> dsjcqpn, irokors, wzbewii
+oausk (31)
+rpjfkh (55)
+mxnaq (3937) -> glcsinj, icush, wjrhp
+kviiza (70)
+anggtqq (86)
+uuxpvxf (114) -> nhjtvk, vezhmd
+yrolq (64)
+tkjofj (60) -> mjqkaqs, lnfjj, nakli
+nasbs (70)
+usevjww (15)
+valby (106) -> vgfhpwb, xtnvc
+zxygmaq (10)
+tdmirp (75)
+zodwdpq (93)
+uyhrcfl (76)
+mqgbif (73)
+oqjqu (67) -> xbxxe, yjwvnhl, vmsoc, tlpfhx, rxjly, dyazidi
+euwab (49) -> cdfmatu, wawtrk
+admjq (40) -> qvaayfl, uqynzy
+petvm (24)
+zqpxn (196) -> himyt, zvtfm, xpotznx
+nxxlbnt (34)
+kpbawoe (26)
+zlhpt (74) -> zvbqni, iytvm, htitjjt, aqxaecv
+kkmax (37)
+recxxj (53)
+ejhojmh (56)
+dnovxt (44)
+crslvc (69)
+fnayjx (64)
+lytrpo (47)
+auvuxv (242) -> wqojj, ndikjqv
+zesfmu (37)
+cnffplo (166) -> fuaio, pywtg
+dfmjy (399) -> isxysg, dxlpr
+xcfxvd (92)
+xznhz (54)
+mclqrmw (15)
+cqvdpy (62) -> yzcez, nvrjzg, sebvkw, pgaiut, bggovyb, wfsaglg, teygd
+fewgct (90)
+xaden (108) -> jagajrh, fucxhz
+xvhgvw (36)
+ejekn (98) -> kemkz, souqntk
+hsvmept (30)
+zwopz (60) -> byedxex, yxbaldn, hnkvw, lvkeqm, kigyp, ruedk
+uqynzy (80)
+axzszf (167) -> iiuqtqw, vktjns
+gugxitg (553) -> trlcj, olawkuc, xeihyok
+wugia (2689) -> temju, xkymbld, ntlrkw
+lxexhp (35)
+scnhwcs (74)
+yhukqf (50)
+upozls (20)
+qladcl (44)
+wjgjhc (5)
+fucxhz (93)
+nayvvrh (25) -> ejtdhx, oyurlfq
+oonpy (15) -> wyryqvy, zkgdtp
+xowkw (41)
+zildb (116) -> umjcr, pinqp, piizso
+hrrld (1802) -> pqiuhyp, nkwwia, exsmez, rarkt, hsdym
+lzojty (214)
+uzljl (710) -> pmolg, benqzp, khfzis
+vyinb (154) -> fzyim, vrfme, hjbfr
+syogw (36) -> mevujmj, wpphwjv
+qyfsc (47)
+wvvivob (6)
+wksjlix (81)
+reomle (191) -> jacmj, amcixd
+fzyim (20)
+zfipnh (21)
+uopxjn (64)
+gaxdd (25)
+dzwfsix (87)
+nrxyk (29)
+vbjpz (13)
+kgxfc (30) -> kzjozhi, dtqgdc
+nfkfex (134) -> vsjjq, nduildw
+cpujsn (22)
+weipv (91)
+wjceo (184) -> resoi, gaxdd
+unkkoph (119) -> myhnuu, lcmlbj
+lnfjj (50)
+bmmzqxb (81)
+gzocw (110) -> qkjdjpe, yxxdal
+uxjaa (131) -> coapfqs, kxrbd, rkctaq, xfyqx
+jimltsw (16)
+nptqxtu (95)
+rpwdig (10)
+xflhoc (20092) -> bqyqwn, hycgb, nrgzcge
+jfofam (6042) -> gewpohj, ndticx, xflhoc
+syvza (99)
+whrinsh (34)
+coapfqs (20)
+souqntk (98)
+rpgzp (44)
+wgupfl (65)
+jxawk (34)
+zeolg (214)
+qzvobt (53)
+nmazby (120) -> yijwaf, idmqvse, dsmjo, wqilo
+yuiyjpc (862) -> eavas, lxttas, codkti
+rkuzg (83)
+gdvuw (179) -> vrtgae, teqej
+pinqp (59)
+xtnvc (99)
+gppwsbp (35)
+exsmez (1357) -> pralyx, tkmfbk, unkkoph
+ewvvb (83)
+nlfdps (87)
+jmuqp (44)
+mieuhe (97)
+donzb (407)
+igbzlxl (27)
+invqsb (5)
+xxdcgas (30) -> auezw, wwbebbr
+qhkhuow (44)
+sgytd (62)
+ikzap (5388) -> mjrktxe, tlqjsb, yuiyjpc
+kvvkbhi (55)
+xahvbm (222) -> udgssh, bbbhx
+iiuqtqw (45)
+isrgei (173)
+ntlrkw (36) -> gkwyfz, acjedny, mcucysr
+qxugs (31) -> iqmpc, lrtzi, krgtrdn
+sebvkw (214) -> qotyaq, dhvsrt
+gcswiam (1183) -> vahmn, cwfydbh, cjjytkr
+ncuzpin (39)
+sybvdj (83)
+obzrtar (62)
+thhakxn (103) -> pplis, tykcvi, mklqpn, jzgvab
+vtjtyp (152) -> dhisacj, zpxgfq, oqeam, fcgkmq, nnyws, qxugs, oxoul
+icxzod (15)
+nakli (50)
+bzmqg (374)
+dhisacj (73) -> rndvcf, oqmxlu, ncuzpin
+pdzooh (13)
+pvyrkg (51) -> yytmc, clqfbvi, tmkli
+scvhl (28)
+qwotm (169) -> pqrpkmd, whrinsh
+dcpzwz (87) -> wxgoew, xqwfgy, hrjlzxr, wapknj, ejoxsy
+qsdyww (55)
+puvmdie (41)
+umjcr (59)
+himyt (41)
+tptqtpq (57)
+zkwajbd (61)
+vutdji (31) -> bsvgagj, puvmdie, liujmc, xowkw
+lpsaav (94)
+bmcwbsi (96)
+rtbcch (64)
+nadbegy (66)
+jyazs (74)
+xcmzg (30)
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+tzimies (65)
+jfhzgp (67)
+wyryqvy (90)
+kirnt (134) -> bmlfd, fykgs
+xhgza (16)
+xajzwdh (65)
+tpcbt (81)
+zmoxc (99)
+bcbftl (38)
+arrvxtj (71)
+imiimt (22)
+tqelui (86)
+sibvtz (79)
+pchfpqp (86)
+faopk (147) -> figvamv, jlsmm
+wscqe (14) -> ezzpr, chyun
+emkgc (142) -> lcrbt, pcvfgti
+nreuwh (62)
+vahmn (49) -> twyhx, rztur, pchfpqp, anggtqq
+eourjv (204) -> kpbawoe, zjwqc
+ssvfbfs (96)
+dxlpr (8)
+sgovqnf (69) -> kzsoasg, dnbejx
+eoxwp (133) -> zxygmaq, xadjes, nulax, rpwdig
+ydffzgu (380) -> olvztw, zfipnh
+byojhfr (97)
+nlwakg (161)
+ztxcc (68)
+zisdcf (18)
+itutdol (55)
+cseckdt (11)
+zqwqcnq (37)
+fhqhu (188) -> igbzlxl, llalaql, ppjapn, csdap
+kzsoasg (70)
+cvqbwem (92) -> wjceo, gqqsfsr, vukpdsr, cneno, bvaoy
+pjujovx (96) -> ayuma, bmmzqxb
+vjobpzv (24)
+kerjk (84)
+qvaayfl (80)
+bcesxba (444)
+hnyjyga (95)
+gjjfx (131) -> btwmd, xznhz, dsezlbe
+idmqvse (32)
+ygqxl (16) -> nhvyso, talptwp, qiznqk, ugzmeb
+ozyqew (95)
+itxgz (370) -> epqowm, jrhzmbj
+afntec (96)
+cgveph (71)
+isxysg (8)
+cqlvkj (65)
+ykitsi (63)
+bjhxuqc (53)
+uahcz (50)
+vbejzc (38)
+cujuai (157) -> ldqyt, fgcajp
+kgphv (246) -> wvvivob, sjoov
+gqqsfsr (78) -> ckudisa, kwhgtnk
+dofou (44)
+uijffti (65)
+nkzgse (7)
+xrtzs (96) -> ictsk, invra, rkgoovn, gzocw, hbptt, ucilvib, cnffplo
+zvbqni (105) -> qkzpcyy, qsrxouy
+zqbpucs (568) -> dfmjy, fnnykbh, gqeiy, fifams
+lnndami (68)
+rcluk (156) -> fjticim, mbbuqoi
+zylotoh (7)
+phcqntb (76)
+amcixd (29)
+jlsryou (95)
+rceksnv (57)
+vwnvlh (1534) -> krnbkr, egizyey, empixc, lzojty, vyinb, zeolg, qxnvoh
+chyun (94)
+hrjlzxr (1124) -> ybixf, qmshniw, zrnlkl
+bwlit (20)
+grxdbx (34)
+eqgvf (9) -> wdbmakv, zqamk, hvecp, rbzmniw, jfofam, tigvdj
+uqals (78) -> ropdc, pbdafpz, mgqil, pygrhr, eourjv
+veuzidj (49) -> kmhug, yrolq, csfzl
+eovobtl (149) -> hzuyh, iftcnc
+udgssh (5)
+nxbec (96)
+dyomhm (40) -> npxexv, xbccghy, jncjxue, nadbegy
+fsdoohr (64)
+lcrbt (29)
+rarkt (1387) -> mjqzvuu, nzhbfc, veuzidj
+temju (53) -> qpzszp, cqlvkj
+nrgxdmx (1352) -> mlalrpt, nqfqgj, cuscn, ogowst, vfrylx
+tlpfggk (25)
+wzimze (4005) -> uwjkolt, jynmg, ibqmynm
+ddgnyfo (79)
+fyaxzl (18)
+qpzszp (65)
+eitdb (197) -> trvtkqj, kwnqw
+fgsmzi (525) -> dzuqljn, ihvefep, uhrdeol, gdvuw
+nevrtrs (83)
+jyftx (76)
+lcitl (1114) -> nlwakg, hwgwzv, girxc
+kzjtb (78) -> gacseeh, lycfbo, aifpxqv
+zacwh (5)
+glcsinj (90) -> aemkbp, yxxgd, fhqhu, xquhgig, nxmhned, lqbmor, qmyfg
+rswnjx (57)
+cokvree (96)
+ewgadin (39)
+oqsdzpe (50)
+yznmd (62) -> uvkwg, mncivb
+lpdhdvy (65)
+kmhug (64)
+bvtgvu (94)
+hycgb (237) -> zmciyk, ysbhsn, vxslvq
+ycuuwxa (161) -> vehziv, rvqopbu
+mieqogh (19)
+xadcuw (1626) -> chgfb, stofi
+supjxi (21)
+rfqddq (53)
+qbaosu (314) -> hshafy, ukgbdva
+ptxfk (73)
+lofybs (89)
+agjpn (8265) -> ocgbpez, ejdxula, kgbzu
+mgbgb (334) -> kksizqf, dofou
+izxpf (39) -> ewobo, ntezb, sbmqxu, tlpfggk
+znagag (89)
+zmciyk (19) -> mieuhe, psjec
+dhobx (95)
+hvecp (90) -> hrrld, jazqb, fonrb, dcpzwz, vqinar, bxqqvue
+sjbfmfa (80) -> fewgct, jupzgjm
+fmpvv (74)
+bcadp (91)
+tmzxl (23)
diff --git a/2017/d08/ex1/ex1.py b/2017/d08/ex1/ex1.py
new file mode 100755
index 0000000..c762819
--- /dev/null
+++ b/2017/d08/ex1/ex1.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python
+
+import enum
+import operator
+import sys
+from collections import defaultdict
+from typing import NamedTuple
+
+
+class Operation(enum.StrEnum):
+    INC = "inc"
+    DEC = "dec"
+
+
+class Comparator(enum.StrEnum):
+    GT = ">"
+    GE = ">="
+    LT = "<"
+    LE = "<="
+    EQ = "=="
+    NE = "!="
+
+    def __call__(self, lhs: int, rhs: int) -> bool:
+        return getattr(operator, self.name.lower())(lhs, rhs)
+
+
+class Condition(NamedTuple):
+    target: str
+    comp: Comparator
+    value: int
+
+    def eval(self, registers: dict[str, int]) -> bool:
+        return self.comp(registers[self.target], self.value)
+
+
+class Instruction(NamedTuple):
+    target: str
+    op: Operation
+    amount: int
+    condition: Condition
+
+
+def solve(input: str) -> int:
+    def parse_line(line: str) -> Instruction:
+        target, op, amount, _, comp_target, comp_op, comp_value = line.split()
+        return Instruction(
+            target,
+            Operation(op),
+            int(amount),
+            Condition(comp_target, Comparator(comp_op), int(comp_value)),
+        )
+
+    def parse(input: str) -> list[Instruction]:
+        return [parse_line(line) for line in input.splitlines()]
+
+    program = parse(input)
+    regs: dict[str, int] = defaultdict(int)
+    for instr in program:
+        if not instr.condition.eval(regs):
+            continue
+        regs[instr.target] += instr.amount * (1 if instr.op == Operation.INC else -1)
+    return max(regs.values())
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d08/ex1/input b/2017/d08/ex1/input
new file mode 100644
index 0000000..e1d8dc5
--- /dev/null
+++ b/2017/d08/ex1/input
@@ -0,0 +1,1000 @@
+sd dec 441 if k != 0
+lp dec 419 if mxn >= 7
+w inc -592 if icg >= -9
+a dec -29 if q <= 9
+kt dec 486 if ms != 8
+kt inc -841 if kt > -488
+rz inc -592 if m <= 1
+xtz dec 780 if lp < 9
+iox dec 804 if icg != 6
+lp inc 360 if i == 9
+f dec -570 if gi >= 7
+um inc 87 if q != 4
+kt dec -242 if rz != -595
+j inc -154 if db != 0
+giq dec 728 if iox > -811
+a dec -9 if xtz > -781
+lp inc -261 if ms > 2
+w inc -816 if hey > -1
+mxn inc 680 if ms >= -9
+q inc -777 if w < -1400
+wm dec -353 if q == -774
+q inc 414 if hey == 0
+xdl inc 488 if kt != -1075
+gus dec -136 if fxx != -7
+f dec 852 if hey >= 10
+j inc 531 if ms <= -9
+km dec 231 if xdl >= 487
+fxx dec 579 if iox == -804
+km dec 23 if kt != -1076
+fxx inc -845 if xtz != -773
+mxn dec 335 if fxx != -1432
+q dec 184 if f == 0
+wm dec -330 if f == 0
+iox dec 677 if mxn != 339
+mxn inc -429 if hey < 1
+rz dec 101 if hey == 8
+k inc 17 if db == 0
+gus inc -328 if iox == -1481
+a inc 657 if rz <= -584
+wm dec -365 if rz < -590
+m inc -710 if w < -1399
+kt inc -246 if wm != 698
+w dec 976 if fxx >= -1431
+giq inc 319 if hey >= -5
+iox inc -563 if xdl < 495
+xdl dec -349 if f >= -9
+sd inc -296 if q >= -555
+xdl inc 406 if cl >= -2
+f inc 966 if hey >= -6
+lp dec -838 if iox > -2054
+k dec -674 if q < -542
+i inc -23 if k < 692
+mxn inc -221 if sd != -302
+mxn inc -830 if mxn > -309
+km inc -283 if db > -7
+icg inc 365 if xdl > 1234
+q inc -23 if m < -702
+wm dec -507 if rz < -582
+j inc -501 if gi != -10
+um inc 274 if a > 689
+db inc 814 if xdl != 1250
+fxx dec -172 if db != 822
+wm dec 581 if kt <= -1323
+gi dec -715 if kt >= -1339
+f inc -209 if i >= -31
+q inc 933 if fxx > -1246
+mxn dec -227 if gi > 713
+fxx dec -112 if xdl <= 1252
+hey dec -998 if xtz >= -781
+lp dec -743 if ms <= 4
+icg dec -581 if fxx > -1149
+gus inc 725 if k != 698
+icg dec 156 if kt != -1339
+gus dec 961 if i > -32
+giq dec -992 if kt <= -1327
+m inc -477 if xdl >= 1240
+db dec -258 if gus <= -424
+wm inc -72 if gi > 713
+i dec 923 if lp == 1581
+m inc -221 if iox == -2044
+j inc 410 if m < -1402
+kt inc 838 if a == 685
+i dec 528 if gi < 712
+iox dec -823 if i >= -952
+a dec -705 if icg > 799
+gi dec -538 if db > 1079
+xdl inc -507 if q > -571
+rz inc 37 if km > -546
+fxx dec -718 if ms <= -2
+xdl inc -742 if cl < 4
+q dec 591 if wm > 542
+a dec 100 if db != 1072
+fxx dec -392 if giq >= 579
+j inc 991 if i >= -942
+m inc 311 if sd != -296
+icg inc -286 if db != 1075
+m inc 906 if rz == -555
+um inc 150 if hey == 993
+rz inc -637 if fxx < -746
+ms dec 779 if f >= 751
+gus inc 928 if j != -100
+rz dec 769 if sd < -292
+xdl inc -556 if gus <= 505
+rz inc -94 if j < -82
+mxn dec -763 if cl == 0
+xdl dec -693 if gus <= 502
+db inc -879 if kt <= -1339
+w dec 651 if hey > 991
+um dec -898 if giq == 583
+xdl dec 501 if hey > 998
+wm dec 746 if lp < 1587
+iox inc 915 if um > 1251
+a inc 573 if q >= -1165
+j dec -459 if m <= -512
+km dec -601 if xdl >= 131
+km dec 801 if f >= 756
+ms inc 318 if j < -91
+hey dec -768 if i <= -945
+f inc -982 if xdl < 134
+i inc 210 if iox < -305
+icg inc -838 if xtz >= -784
+mxn dec 901 if f == -225
+m inc 601 if i <= -733
+iox inc -863 if cl >= -5
+ms dec -474 if db >= 1069
+xtz dec 708 if um >= 1253
+lp dec 0 if xdl < 130
+k inc -476 if sd <= -291
+um dec 475 if hey != 1756
+q inc 178 if k <= 215
+km dec 244 if a >= 1265
+j dec 485 if k < 209
+icg inc 429 if um >= 784
+ms inc -881 if kt > -1341
+cl inc -75 if iox < -1176
+icg dec -72 if gi == 715
+i inc 714 if lp >= 1572
+rz inc -881 if j >= -96
+ms dec -453 if i <= -29
+giq dec -500 if sd != -305
+sd dec -78 if lp != 1572
+a inc 313 if db == 1072
+w dec 97 if q == -978
+gus dec -203 if f != -225
+xdl dec -894 if j < -88
+q inc 71 if k != 213
+um dec -242 if wm > -207
+kt dec -997 if sd != -215
+cl dec 643 if lp != 1587
+hey inc -564 if fxx == -748
+ms dec 639 if m != 95
+ms dec 131 if w <= -3026
+xdl dec 241 if w != -3032
+mxn inc 404 if i == -28
+giq dec 111 if xdl >= 789
+wm inc 93 if j <= -88
+xdl inc 318 if um >= 1026
+gi dec -766 if a < 1587
+mxn inc 212 if w > -3040
+f dec -601 if giq == 1084
+m dec 135 if kt >= -334
+a dec -471 if rz >= -2940
+cl dec -379 if giq != 1080
+w inc -834 if db < 1077
+km inc -515 if f >= -226
+i inc 133 if a > 2043
+gus dec -368 if gi >= 1476
+db inc -629 if fxx > -758
+km inc -807 if a != 2052
+j dec -129 if cl > -267
+gi dec -443 if m <= -35
+kt dec -355 if sd != -218
+mxn inc -734 if xtz == -1488
+icg inc 468 if m == -34
+m inc 896 if iox <= -1168
+xdl inc -763 if j < 39
+db inc -51 if xdl >= 337
+sd dec 688 if icg >= 167
+w inc 307 if gi >= 1924
+ms inc 190 if xdl >= 331
+k inc 869 if fxx >= -750
+mxn inc -772 if ms >= -1771
+f inc -303 if q == -922
+kt dec 99 if ms < -1757
+j dec -733 if sd < -904
+wm inc -808 if gi <= 1933
+q dec -671 if i != 112
+cl inc -790 if xdl >= 330
+icg inc -617 if ms > -1774
+w inc 529 if xdl > 333
+w inc -413 if wm < -907
+db inc 780 if xdl > 330
+xtz inc -535 if um <= 1025
+mxn inc 415 if db > 1165
+xtz inc 170 if db != 1169
+k dec -365 if k <= 1091
+giq inc -695 if q < -233
+db inc -991 if a > 2057
+k dec 543 if fxx == -748
+kt inc 673 if hey <= 1209
+gi inc -23 if mxn <= -1917
+m inc -567 if sd > -916
+m dec -269 if wm == -912
+kt dec 601 if db != 1180
+km dec -781 if kt == -351
+rz inc -296 if wm != -912
+um inc 4 if gus != 874
+um inc -876 if q < -231
+gi dec -744 if xtz < -1320
+j inc -101 if q <= -236
+kt inc -959 if xtz == -1318
+icg dec 9 if m == 562
+kt inc -412 if gus > 867
+fxx dec 394 if gus > 867
+fxx dec 105 if xtz == -1318
+a dec -533 if giq != 396
+km dec -864 if um != 147
+mxn dec -240 if i != 114
+m inc -830 if km != -628
+iox inc 160 if mxn != -1690
+k inc 966 if j > 679
+xtz inc 482 if cl <= -1050
+f inc -430 if fxx < -1253
+sd inc 138 if sd > -915
+giq dec 736 if xtz == -836
+f dec 780 if ms >= -1767
+wm inc -362 if kt <= -1731
+um dec -195 if xtz >= -838
+um dec 888 if i >= 107
+i dec 754 if gus != 868
+hey inc -518 if kt <= -1726
+iox inc 843 if hey > 676
+ms dec -46 if a < 2587
+mxn inc 288 if gus >= 864
+gus inc -643 if mxn < -1393
+um inc 457 if rz >= -2936
+um dec -976 if xtz == -836
+m dec 783 if fxx > -1254
+gi inc -63 if m <= -1043
+lp dec -244 if cl > -1062
+sd inc 908 if km >= -637
+km inc -725 if kt <= -1731
+j dec -20 if k == 906
+wm dec -596 if kt >= -1740
+xtz dec 133 if km <= -1355
+db inc -792 if icg != -466
+db dec -851 if lp != 1835
+cl dec 707 if f > -1012
+iox dec 246 if iox >= -170
+um dec 719 if ms == -1720
+xtz dec -216 if icg != -464
+km dec 776 if w <= -3446
+j dec 388 if xdl != 339
+j dec 776 if kt == -1732
+mxn dec 615 if cl == -1761
+i inc 579 if gus < 226
+i inc -172 if xdl < 341
+ms inc 720 if lp < 1825
+ms dec -590 if hey < 690
+iox dec -781 if gus < 231
+mxn inc -145 if a >= 2577
+q inc -885 if f <= -1013
+xtz inc -148 if a != 2593
+km inc -586 if fxx < -1239
+um inc -988 if kt < -1724
+k dec -852 if xtz != -891
+j inc -365 if m != -1050
+gus inc -679 if cl != -1760
+um inc -342 if icg != -455
+hey inc -807 if mxn == -2157
+w dec 759 if w != -3439
+ms inc -328 if gus >= -455
+gi inc -179 if iox == 369
+ms inc 930 if giq != -345
+fxx inc 959 if giq == -338
+km dec -605 if db <= 1226
+um dec 954 if gus == -460
+f inc -325 if giq < -341
+cl dec -95 if cl <= -1752
+hey dec 825 if sd < 141
+db dec -608 if sd >= 139
+giq inc 141 if lp > 1821
+a dec 824 if km <= -2715
+k inc 982 if db < 1840
+k dec -6 if giq != -213
+xtz dec -59 if kt <= -1731
+fxx dec -589 if a == 1761
+m inc 874 if rz == -2936
+m dec 241 if xtz == -838
+gus dec 512 if w > -4208
+mxn inc 651 if gus == -973
+lp inc -553 if hey == -948
+giq inc 252 if lp > 1263
+km dec -360 if a == 1761
+giq inc -504 if a != 1770
+kt inc -815 if um <= -1146
+lp dec 343 if gi >= 1652
+w dec 6 if lp <= 937
+gus dec 806 if ms > -534
+q dec 262 if f > -1335
+rz dec -959 if sd <= 141
+w dec -958 if mxn == -2157
+gus inc 530 if xdl > 333
+lp dec -30 if hey > -949
+lp dec 345 if q != -509
+i inc 509 if km > -2363
+rz inc -576 if um == -1155
+km inc 622 if iox > 367
+k dec -833 if ms != -527
+um dec 586 if i == 1027
+q inc -724 if rz == -2553
+cl dec -372 if f <= -1330
+cl dec -944 if j > -442
+j dec 674 if hey != -958
+q inc -830 if j != -1135
+cl dec 594 if um < -1749
+gi dec -991 if q > -2066
+kt dec -528 if giq >= -465
+iox inc -291 if a > 1759
+q dec -395 if f != -1330
+um dec 244 if cl <= -1285
+a dec 961 if um < -1988
+iox inc -321 if w == -3253
+lp dec -307 if iox < -241
+m dec -188 if mxn == -2157
+um dec -481 if icg <= -450
+gi dec 303 if cl < -1294
+mxn dec -791 if wm != -684
+kt dec -368 if sd != 149
+mxn dec -783 if sd < 141
+gi dec 864 if m == 11
+gus dec -17 if w == -3253
+w dec 499 if giq > -464
+xtz inc 659 if q > -2067
+wm inc 572 if kt != -1654
+xtz dec -287 if xtz != -191
+sd inc 763 if kt <= -1658
+xdl inc 830 if gus == -1225
+icg inc 508 if km == -1737
+gi inc 756 if rz == -2560
+xtz inc 983 if km <= -1734
+w inc 717 if xtz > 1085
+q dec 52 if w < -3030
+xdl inc -373 if f <= -1321
+w dec -544 if icg > 56
+gus inc -120 if km > -1741
+mxn dec -16 if hey <= -947
+wm dec 591 if mxn != -576
+gus inc -355 if kt <= -1644
+xdl inc 898 if fxx <= -650
+f dec 71 if m != 11
+xtz dec 902 if fxx > -663
+kt dec -576 if db != 1831
+rz inc 465 if fxx < -650
+a dec 342 if fxx >= -666
+k inc 293 if cl != -1286
+iox dec 791 if db == 1839
+a dec 125 if kt != -1071
+gi dec 852 if xtz == 185
+f inc 982 if sd == 133
+mxn dec -426 if sd <= 146
+gus inc -100 if xdl <= 1696
+um inc 872 if xtz != 182
+db dec -10 if db < 1843
+q inc 209 if lp >= 920
+k inc -338 if hey >= -950
+m inc -601 if wm < -695
+w dec 725 if xdl >= 1694
+wm inc -913 if q >= -1901
+fxx inc 986 if sd <= 144
+a dec 329 if m == -590
+xtz inc 80 if q < -1893
+gus inc 234 if fxx == 328
+ms inc 110 if giq < -451
+gus dec -969 if sd != 134
+um dec 806 if ms <= -417
+gus dec -458 if icg < 53
+cl dec -272 if fxx > 326
+k inc -212 if sd != 143
+xtz dec 109 if fxx <= 324
+mxn dec 302 if m >= -599
+lp inc -240 if giq <= -451
+m dec -58 if wm != -1618
+xtz dec -178 if gus == -139
+giq inc -132 if xdl != 1694
+w inc -149 if a >= 962
+f inc -512 if lp <= 690
+lp dec -84 if sd < 147
+cl inc 657 if db <= 1851
+m inc -180 if hey == -948
+sd inc -711 if a < 974
+ms inc -905 if j != -1134
+f inc -852 if mxn >= -451
+lp inc 818 if i == 1027
+w dec -407 if wm <= -1610
+m dec -298 if gi > 926
+gi inc -17 if sd != -564
+ms inc 891 if kt != -1075
+xdl inc -498 if fxx != 337
+kt dec 153 if lp == 1575
+db inc -565 if f < -2690
+lp inc 812 if um <= -1438
+fxx inc 151 if um != -1429
+fxx dec 484 if km < -1732
+q inc 130 if f == -2690
+lp dec 926 if icg != 58
+giq dec -378 if k >= 3321
+cl dec 136 if ms == -1323
+xdl dec -889 if w != -3502
+hey dec 540 if hey == -948
+a dec 796 if xdl >= 1189
+xtz dec 197 if kt < -1066
+i dec 328 if db == 1284
+giq dec -697 if hey > -1482
+f inc -985 if icg != 51
+gi inc 128 if f > -3689
+j dec 638 if i != 699
+mxn inc 300 if icg < 55
+icg inc -846 if q <= -1900
+icg dec -845 if giq > -86
+cl dec 502 if hey < -1482
+db inc -18 if hey != -1483
+giq inc -398 if wm < -1615
+xtz inc -724 if gus > -146
+um inc -761 if gus >= -137
+gi dec 423 if mxn <= -146
+xtz dec -632 if ms >= -1326
+gi dec 990 if i == 693
+xtz dec 292 if i == 699
+q inc 881 if xtz >= -143
+xdl dec -25 if a <= 175
+f dec -599 if iox >= -1036
+giq dec -502 if gus == -139
+xdl dec 235 if gus >= -139
+q inc 704 if wm <= -1610
+ms inc 693 if i == 699
+k inc 407 if ms != -627
+f dec 107 if iox <= -1029
+xtz inc -328 if w != -3502
+j dec -474 if xdl < 994
+gus dec 82 if fxx != -12
+db dec -913 if xtz >= -143
+iox dec -932 if gus != -230
+giq inc -74 if q > -316
+ms inc -711 if gi != 1039
+w dec -29 if q >= -315
+um inc -851 if xtz == -141
+f inc -816 if ms <= -1348
+hey inc 813 if lp > 1468
+sd dec 483 if icg != 48
+w dec -199 if db <= 2181
+q inc -846 if sd != -572
+db inc -134 if k <= 3732
+um dec -185 if mxn > -145
+rz inc 559 if a < 174
+cl inc 650 if f != -3190
+gi inc 785 if cl >= -343
+w inc -227 if lp >= 1468
+gus inc -437 if wm < -1608
+kt inc -301 if w < -3499
+k dec -873 if km < -1736
+xdl dec -262 if q < -1155
+f dec 325 if mxn >= -149
+wm inc 523 if km < -1736
+gus dec -643 if db <= 2053
+gus dec 998 if iox > -95
+icg inc 774 if q < -1160
+k inc 789 if a > 159
+fxx dec 447 if xtz <= -133
+m inc -730 if rz <= -1526
+mxn dec -825 if cl > -346
+xtz inc 846 if sd > -576
+mxn inc 128 if cl < -352
+cl dec 99 if xtz <= 704
+lp dec -537 if ms >= -1341
+giq dec 784 if w == -3501
+iox inc 410 if giq <= -437
+f dec 314 if iox <= 317
+kt inc 520 if a == 169
+wm inc -419 if km >= -1740
+icg dec 900 if fxx != -450
+hey dec 564 if hey <= -670
+um inc 653 if lp < 2016
+hey dec 835 if fxx <= -447
+giq dec 542 if giq == -433
+gus dec 320 if cl > -354
+icg inc 75 if i > 695
+iox inc -949 if j <= -649
+q inc 0 if ms == -1341
+um dec 180 if rz != -1538
+i inc 534 if rz >= -1536
+i inc -316 if fxx == -452
+rz dec 225 if icg <= 2
+gus inc -416 if km != -1727
+icg inc -325 if m >= -1150
+rz dec 892 if gus < -742
+k inc -832 if j > -657
+wm inc -10 if gus <= -752
+f dec 179 if rz < -2644
+q inc 817 if kt > -859
+fxx inc 501 if xtz < 712
+m inc 111 if kt < -862
+ms dec -896 if gus != -749
+kt dec -925 if kt >= -862
+fxx inc -713 if cl <= -355
+xdl dec -120 if a == 172
+a dec -757 if hey != -2073
+gus inc 127 if mxn != -12
+xdl inc -627 if f == -3995
+kt dec 832 if lp < 2004
+w dec 208 if kt > 61
+kt dec 378 if lp >= 1998
+cl dec -371 if xdl > 1249
+f dec 708 if i < 927
+db dec 602 if ms > -443
+cl dec 247 if f > -4707
+um dec -394 if gi != 1040
+j dec 190 if giq >= -440
+gi inc 560 if q == -347
+xdl inc -601 if gus >= -630
+k dec 934 if iox == -641
+m inc -672 if icg >= -334
+w dec 104 if xdl != 647
+lp dec 36 if icg >= -329
+mxn dec 768 if m >= -1821
+f dec 555 if k == 3625
+w dec 440 if q >= -353
+lp dec -83 if kt != -316
+hey dec -168 if db != 2042
+giq dec 460 if xtz == 708
+fxx dec 446 if icg <= -325
+icg dec -22 if xtz != 717
+ms dec 920 if j != -841
+hey inc 213 if db < 2053
+mxn dec 862 if w < -4150
+rz dec 873 if xdl <= 656
+gi inc -584 if lp > 2047
+kt inc -29 if um <= -385
+m inc -883 if xtz < 715
+j inc 850 if iox == -641
+xdl dec 738 if w > -4154
+icg dec -851 if kt <= -329
+db inc -437 if ms > -449
+kt inc 280 if xtz > 702
+iox dec 924 if giq <= -899
+m dec 453 if cl < -344
+fxx inc -543 if i > 914
+rz inc 402 if f > -5269
+iox dec -260 if giq >= -900
+km dec -971 if sd >= -578
+wm inc 193 if k == 3630
+xdl dec -416 if a != 932
+lp inc 213 if icg == 545
+um inc 864 if wm <= -1516
+lp dec 343 if fxx <= -943
+rz inc 657 if kt > -50
+kt dec -253 if xdl <= 328
+km inc 256 if mxn > -781
+hey inc 856 if k == 3625
+gus inc 266 if f < -5264
+rz dec -139 if m <= -3151
+hey dec -669 if db == 1603
+gi inc -452 if ms == -445
+kt inc 123 if mxn == -783
+f inc -656 if sd > -562
+m inc -479 if i > 915
+um inc -288 if sd == -571
+giq dec -68 if gi == 9
+fxx dec -867 if fxx != -940
+um inc 80 if m > -3636
+i dec 980 if j < 9
+lp inc -932 if km < -764
+cl inc 387 if mxn != -788
+wm dec -492 if km != -766
+km inc 571 if m > -3634
+kt inc 903 if q >= -340
+wm inc 852 if k < 3616
+um dec -210 if m < -3629
+j inc -136 if m < -3623
+j dec -575 if i != 908
+sd inc 762 if xdl == 325
+gi inc -933 if kt != 314
+giq inc 272 if fxx < -939
+um inc -279 if iox <= -386
+xtz dec 303 if f < -5258
+xtz dec 344 if iox != -378
+giq dec -384 if f < -5264
+f inc -698 if mxn <= -778
+rz inc -185 if q <= -342
+um dec 272 if db <= 1613
+rz inc -650 if q <= -347
+xtz dec -621 if q <= -340
+kt inc 497 if sd < 200
+gus dec -786 if km < -203
+um dec 584 if a != 926
+hey dec 467 if xdl <= 318
+ms inc -975 if j == 448
+rz inc 763 if w <= -4144
+cl dec 923 if i >= 915
+km inc -294 if fxx >= -942
+fxx dec 218 if ms != -1420
+q inc 671 if gus < -350
+xdl dec 652 if i >= 913
+xtz dec -657 if gus > -367
+km dec 316 if j != 457
+wm dec 664 if fxx <= -932
+iox dec 463 if gus != -359
+hey inc -254 if fxx <= -940
+cl inc -684 if q > 317
+rz dec -287 if xtz < 1348
+lp dec 315 if lp != 1340
+hey dec -685 if q >= 325
+kt dec -360 if icg <= 553
+a inc 834 if um >= -646
+m inc -91 if sd < 183
+a dec 37 if k != 3617
+a inc -306 if sd != 201
+k dec 822 if q <= 327
+iox inc -885 if iox >= -850
+kt inc -835 if rz == -2113
+cl dec -99 if a < 586
+cl dec 635 if w != -4141
+kt inc -938 if giq == -173
+sd dec 599 if iox != -1720
+ms dec -484 if j != 448
+wm inc 669 if fxx == -945
+iox inc -633 if sd <= -402
+i dec -774 if f >= -5963
+f inc -783 if um < -646
+km inc 6 if xtz > 1333
+gus inc -986 if a == 583
+iox inc -233 if um <= -651
+xtz dec -857 if w != -4149
+wm inc -791 if a < 584
+j dec -41 if cl <= -2111
+xdl inc 77 if rz > -2123
+xdl inc -983 if ms != -1416
+fxx dec 247 if sd == -408
+k inc -362 if k > 2804
+xdl inc 13 if iox >= -2595
+db inc 473 if um <= -654
+w inc 307 if w > -4152
+xdl dec -237 if a <= 584
+wm inc 366 if giq == -173
+j dec 111 if i != 917
+k dec 790 if w != -3848
+sd dec -841 if wm == -2595
+i inc -538 if xdl == -989
+f dec 583 if rz > -2114
+xtz inc -886 if kt <= -590
+ms inc 151 if mxn == -783
+q dec -585 if fxx == -1184
+j dec -102 if km == -799
+xdl dec 504 if sd == 433
+fxx inc -208 if db > 2078
+m dec 471 if q >= 323
+icg inc -296 if i <= 919
+rz dec -601 if mxn > -791
+gus dec -870 if gi > -925
+um dec -171 if gi >= -927
+f inc 969 if gi != -932
+j dec 78 if xdl <= -1481
+m dec 115 if lp != 1019
+km inc 911 if ms != -1267
+gi inc 798 if i <= 920
+iox dec -780 if km < 122
+cl dec 670 if xdl > -1492
+gus inc 231 if kt != -602
+giq dec 584 if k <= 2021
+j dec -142 if k != 2020
+a inc 905 if xdl == -1487
+giq inc -1 if k > 2012
+j inc -123 if sd != 433
+a dec -615 if ms >= -1270
+q inc 848 if ms == -1269
+kt dec -69 if w < -3838
+fxx dec -676 if i > 926
+iox dec 980 if gi > -131
+fxx dec -716 if giq != -758
+fxx dec 937 if sd > 433
+sd inc 414 if i != 914
+cl inc -625 if giq <= -757
+gus dec 306 if fxx != -1390
+q inc 228 if lp != 1010
+ms inc 340 if gus == -549
+cl inc -185 if xtz == 461
+m dec -550 if f == -6363
+fxx dec 73 if lp >= 1019
+ms inc 651 if w != -3842
+giq inc 155 if xtz > 450
+wm dec -41 if icg < 253
+wm inc -535 if k != 2006
+j dec 181 if a >= 2094
+cl inc -70 if km <= 114
+i dec -910 if db < 2085
+mxn dec -616 if giq != -610
+ms inc 688 if lp <= 1019
+kt inc 264 if f == -6357
+gi inc -200 if xdl >= -1496
+rz dec -610 if km < 121
+w dec 82 if wm < -3085
+giq dec 136 if um != -483
+rz inc 804 if km < 121
+i dec 197 if um < -475
+cl dec 656 if ms == -241
+m inc 656 if w <= -3921
+lp inc -497 if gus > -557
+xtz inc 47 if w > -3926
+hey dec -130 if km <= 112
+gus inc 800 if gus > -555
+icg dec 229 if wm == -3089
+kt dec -746 if gi != -333
+xdl dec -365 if m == -2896
+gi dec 286 if j > 430
+wm inc 858 if q > 1393
+mxn dec 440 if iox >= -2798
+sd dec 651 if hey < -282
+um inc 135 if kt <= 220
+hey dec -639 if ms != -251
+lp dec 558 if q != 1393
+kt dec -264 if kt != 217
+sd inc -523 if k >= 2006
+k dec 938 if w <= -3917
+mxn inc -120 if um == -350
+giq inc -223 if icg > 16
+m dec 171 if xtz < 504
+um dec 850 if xdl == -1122
+iox inc 955 if km >= 118
+gi dec -910 if icg == 20
+db inc -39 if xdl > -1116
+mxn dec 481 if xtz > 491
+um dec 766 if iox >= -2798
+sd inc -103 if um != -1967
+q inc -673 if q <= 1403
+hey dec -471 if xdl == -1122
+j inc -818 if sd <= 212
+fxx dec -749 if ms > -238
+w inc 407 if xdl >= -1123
+mxn dec 138 if xtz >= 507
+rz dec 257 if db != 2071
+xdl dec 116 if lp > -38
+mxn inc -162 if xtz <= 495
+gi dec 669 if i < 1633
+gi dec 187 if ms == -251
+mxn dec 893 if xdl != -1229
+k inc 616 if i <= 1633
+xtz dec 881 if a <= 2105
+gus inc 732 if i != 1627
+kt inc 749 if a == 2103
+f inc -289 if rz <= -346
+um inc 919 if f < -6644
+wm inc -646 if m != -3067
+hey inc 1 if a != 2108
+xdl dec 725 if ms <= -238
+j dec -789 if k != 1695
+hey inc 317 if w < -3515
+kt inc 965 if gi >= -379
+wm inc 137 if a != 2101
+sd dec -783 if hey <= 1160
+gus dec -349 if um <= -1046
+ms inc -843 if sd == 1004
+k inc -298 if f >= -6661
+gus dec -15 if gi <= -365
+gus dec -411 if wm <= -2092
+cl inc 25 if icg != 30
+km inc 634 if m == -3067
+kt dec 856 if gus < 1766
+xdl inc -808 if fxx <= -1461
+xdl dec -883 if rz >= -358
+gus dec -311 if j > 1214
+sd dec 349 if xdl == -1888
+mxn dec -309 if j <= 1225
+giq dec 181 if ms >= -1087
+rz dec -951 if iox >= -2788
+k dec -824 if lp != -42
+fxx dec -984 if km <= 746
+mxn dec 333 if gus <= 2067
+fxx dec 742 if db >= 2078
+kt inc -367 if mxn > -1793
+i dec -853 if lp < -27
+kt dec -491 if wm < -2085
+ms inc 233 if wm != -2097
+i inc 729 if rz != -363
+ms dec 246 if km < 737
+xtz dec 455 if cl > -4106
+icg inc -755 if kt <= 1206
+wm dec -828 if mxn <= -1798
+giq inc 397 if xdl != -1888
+mxn dec 861 if cl != -4101
+fxx dec 406 if f <= -6653
+icg dec -101 if rz == -355
+gus dec -147 if cl <= -4101
+cl dec 717 if q > 728
+db dec -276 if m < -3061
+k dec -3 if sd > 651
+lp dec -357 if xtz < -827
+f dec -380 if lp <= 322
+cl inc -740 if gi > -368
+sd inc 744 if fxx >= -1221
+iox inc 39 if mxn != -2661
+fxx inc -569 if ms < -841
+j dec 19 if gus == 2216
+sd inc 826 if f < -6267
+cl dec -377 if f != -6272
+fxx dec 318 if icg >= -638
+db dec 638 if xdl == -1883
+q dec -923 if um >= -1055
+a inc 22 if q < 1656
+rz inc 129 if sd <= 1484
+db dec 408 if kt == 1199
+q inc -782 if iox <= -2750
+w dec 232 if fxx >= -2119
+gi dec -887 if km >= 738
+hey dec 35 if icg < -624
+xdl inc -379 if um > -1052
+hey inc -596 if icg != -638
+hey dec -945 if um >= -1047
+xdl dec -202 if k > 2219
+rz dec 76 if f < -6269
+xdl inc 289 if q <= 876
+rz inc 308 if kt >= 1190
+a inc -190 if lp != 317
+kt inc -195 if db >= 1944
+f dec 526 if q < 878
+wm dec -305 if xdl > -1777
+xdl dec -99 if k != 2215
+fxx inc 953 if wm == -1789
+hey dec 625 if rz == -1
+mxn dec 319 if mxn < -2644
+m dec 611 if f == -6798
+fxx dec -83 if icg < -639
+gi dec 567 if cl > -4830
+ms inc -95 if mxn < -2966
+um inc 862 if gus != 2215
+hey dec -341 if icg == -634
+iox dec 829 if f <= -6801
+giq dec 376 if kt == 1012
+lp dec -990 if um < -183
+iox inc -868 if kt >= 999
+iox dec -670 if f <= -6796
+fxx inc 895 if gus < 2209
+k inc -916 if q <= 873
+rz dec 646 if w >= -3747
+kt inc -807 if j == 1203
+fxx dec 568 if gi >= -43
+giq dec -966 if q < 877
+rz inc 250 if giq < -174
+iox inc -19 if i == 3212
+f inc -404 if k <= 1304
+gi dec -481 if kt >= 195
+giq dec -323 if gi < 424
+lp inc 873 if km >= 752
+icg dec 953 if um <= -182
+q dec 246 if db != 1942
+rz inc -987 if lp > 1307
+hey inc -728 if xtz <= -837
+fxx dec 743 if xtz != -843
+km dec 393 if km <= 740
+rz inc 635 if icg < -1578
+k dec -136 if km <= 742
+gus inc 715 if giq >= -185
+lp dec 782 if km >= 741
+ms dec -140 if sd != 1479
+iox inc -992 if sd != 1488
+wm inc 8 if ms >= -802
+giq dec 134 if xtz <= -830
+mxn dec 877 if xtz > -832
+lp inc -260 if ms > -815
+xdl inc 170 if w > -3742
+q inc -674 if gi != 434
+giq inc -760 if wm <= -1788
+km dec -96 if hey != 1802
+j inc 662 if fxx >= -1904
+gus dec 305 if a <= 1943
+db inc 881 if icg > -1583
+um inc -137 if rz >= -96
+mxn dec -755 if lp == 269
+lp inc -220 if hey > 1799
+cl inc 652 if xdl >= -1678
+gus inc -473 if a >= 1935
+k dec 80 if i != 3216
+gus inc 138 if xtz != -831
+mxn inc 654 if giq >= -1075
+xtz inc -677 if um >= -323
+cl inc -557 if hey >= 1807
+m dec 488 if lp == 49
+k inc -214 if q != -49
+k inc -584 if cl != -4727
+icg inc -423 if ms == -806
+gi dec -323 if fxx >= -1909
+ms dec -61 if giq != -1062
+wm dec 259 if q < -45
+f inc -634 if gi == 753
+iox inc 985 if gi > 750
+km dec -821 if db < 1950
+f inc 105 if gi < 763
+j inc -36 if q <= -44
+ms inc -244 if giq < -1063
+i dec 423 if cl == -4727
+kt dec 77 if sd == 1481
+db inc -779 if gi == 753
+gi dec -525 if iox <= -2985
+f dec 378 if rz != -86
+mxn dec 479 if km < 1671
+f inc -812 if kt > 118
+db inc -121 if kt < 128
+w inc 957 if mxn == -2042
+db inc -97 if mxn != -2052
+km inc 521 if q < -46
+a dec -669 if i >= 2783
+icg inc 47 if km > 2176
+gi inc 459 if gi != 760
+mxn dec 810 if hey >= 1803
+ms inc -896 if xtz != -1522
+fxx inc 331 if cl == -4727
+hey dec 104 if sd < 1482
+f dec -684 if f < -8923
+xtz dec 893 if giq > -1080
+um dec -749 if db < 962
+rz inc 823 if sd <= 1484
+a inc 4 if w > -2793
+cl dec -559 if a > 2614
+iox dec 116 if db <= 956
+cl dec -384 if gus == 2291
+lp inc 522 if kt > 118
+icg dec -250 if km <= 2186
+j inc -144 if mxn > -2843
+kt dec -682 if ms > -1891
+gi inc -320 if sd < 1489
+iox dec -955 if kt != 802
+mxn dec 949 if lp > 570
+mxn dec -84 if wm > -2050
+xtz dec 762 if kt == 802
+wm dec -74 if um != 422
+m inc -948 if gi >= 889
+w inc 90 if w != -2792
+j dec -516 if fxx <= -1568
+cl inc -457 if k <= 1232
+ms dec -288 if w != -2792
+ms inc 57 if db >= 946
+a dec -481 if w >= -2800
+icg dec -210 if ms != -1827
+giq inc 323 if a != 3098
+ms inc -646 if iox <= -3090
+mxn dec -390 if lp > 565
+db dec 634 if hey >= 1701
+iox inc 357 if w >= -2799
+hey inc 434 if icg != -1503
+um dec 763 if xtz == -3168
+giq dec 742 if m != -5115
+giq inc -645 if db < 318
+f inc -832 if ms == -2474
+xtz dec 921 if w > -2799
+f dec -259 if xtz <= -4086
+mxn dec -689 if ms == -2468
+kt inc -725 if iox != -2732
+sd inc -586 if rz <= 730
+w dec 94 if xdl > -1682
+lp inc -793 if km > 2185
+cl inc -764 if j < 2348
+lp dec 656 if fxx != -1577
+f dec -892 if db > 319
+i inc -441 if k <= 1230
+db dec 935 if q == -49
+q dec -926 if xtz > -4094
+q inc 729 if fxx == -1572
+lp inc 115 if k != 1233
+j dec -252 if mxn == -3318
+w inc 695 if gi <= 891
+j dec -721 if gi < 899
+sd dec -132 if sd == 896
+cl inc 856 if icg == -1503
+giq inc -142 if k >= 1218
+iox inc -328 if db <= -617
+db inc -199 if wm >= -1981
+km dec -364 if j == 3066
+cl dec -659 if sd >= 891
+xtz inc -207 if giq == -1632
+cl inc 928 if i <= 2339
+giq inc -897 if km != 2544
+mxn inc -61 if xdl > -1679
+f inc 953 if lp >= 30
+f dec -450 if giq > -2535
+w dec -962 if kt >= 68
+gi inc 317 if km < 2556
+kt dec -271 if k >= 1231
+iox dec 238 if i <= 2352
+xtz inc -840 if ms <= -2467
+giq dec 905 if f >= -8097
+kt dec 484 if icg <= -1502
+lp dec 675 if km >= 2539
+ms inc 772 if j <= 3073
+ms dec 297 if q > 1604
+kt inc 465 if hey > 1701
+w inc 987 if kt > 50
+xtz dec 180 if q == 1606
+um dec -823 if gus != 2284
+hey inc -964 if um == 487
+kt inc 387 if cl > -4046
+cl dec -167 if gi == 1209
diff --git a/2017/d08/ex2/ex2.py b/2017/d08/ex2/ex2.py
new file mode 100755
index 0000000..ed45696
--- /dev/null
+++ b/2017/d08/ex2/ex2.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python
+
+import enum
+import itertools
+import operator
+import sys
+from collections import defaultdict
+from typing import NamedTuple
+
+
+class Operation(enum.StrEnum):
+    INC = "inc"
+    DEC = "dec"
+
+
+class Comparator(enum.StrEnum):
+    GT = ">"
+    GE = ">="
+    LT = "<"
+    LE = "<="
+    EQ = "=="
+    NE = "!="
+
+    def __call__(self, lhs: int, rhs: int) -> bool:
+        return getattr(operator, self.name.lower())(lhs, rhs)
+
+
+class Condition(NamedTuple):
+    target: str
+    comp: Comparator
+    value: int
+
+    def eval(self, registers: dict[str, int]) -> bool:
+        return self.comp(registers[self.target], self.value)
+
+
+class Instruction(NamedTuple):
+    target: str
+    op: Operation
+    amount: int
+    condition: Condition
+
+
+def solve(input: str) -> int:
+    def parse_line(line: str) -> Instruction:
+        target, op, amount, _, comp_target, comp_op, comp_value = line.split()
+        return Instruction(
+            target,
+            Operation(op),
+            int(amount),
+            Condition(comp_target, Comparator(comp_op), int(comp_value)),
+        )
+
+    def parse(input: str) -> list[Instruction]:
+        return [parse_line(line) for line in input.splitlines()]
+
+    program = parse(input)
+    regs: dict[str, int] = defaultdict(int)
+    max_reg = 0
+    for instr in program:
+        if not instr.condition.eval(regs):
+            continue
+        regs[instr.target] += instr.amount * (1 if instr.op == Operation.INC else -1)
+        max_reg = max(itertools.chain(regs.values(), [max_reg]))
+    return max_reg
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d08/ex2/input b/2017/d08/ex2/input
new file mode 100644
index 0000000..e1d8dc5
--- /dev/null
+++ b/2017/d08/ex2/input
@@ -0,0 +1,1000 @@
+sd dec 441 if k != 0
+lp dec 419 if mxn >= 7
+w inc -592 if icg >= -9
+a dec -29 if q <= 9
+kt dec 486 if ms != 8
+kt inc -841 if kt > -488
+rz inc -592 if m <= 1
+xtz dec 780 if lp < 9
+iox dec 804 if icg != 6
+lp inc 360 if i == 9
+f dec -570 if gi >= 7
+um inc 87 if q != 4
+kt dec -242 if rz != -595
+j inc -154 if db != 0
+giq dec 728 if iox > -811
+a dec -9 if xtz > -781
+lp inc -261 if ms > 2
+w inc -816 if hey > -1
+mxn inc 680 if ms >= -9
+q inc -777 if w < -1400
+wm dec -353 if q == -774
+q inc 414 if hey == 0
+xdl inc 488 if kt != -1075
+gus dec -136 if fxx != -7
+f dec 852 if hey >= 10
+j inc 531 if ms <= -9
+km dec 231 if xdl >= 487
+fxx dec 579 if iox == -804
+km dec 23 if kt != -1076
+fxx inc -845 if xtz != -773
+mxn dec 335 if fxx != -1432
+q dec 184 if f == 0
+wm dec -330 if f == 0
+iox dec 677 if mxn != 339
+mxn inc -429 if hey < 1
+rz dec 101 if hey == 8
+k inc 17 if db == 0
+gus inc -328 if iox == -1481
+a inc 657 if rz <= -584
+wm dec -365 if rz < -590
+m inc -710 if w < -1399
+kt inc -246 if wm != 698
+w dec 976 if fxx >= -1431
+giq inc 319 if hey >= -5
+iox inc -563 if xdl < 495
+xdl dec -349 if f >= -9
+sd inc -296 if q >= -555
+xdl inc 406 if cl >= -2
+f inc 966 if hey >= -6
+lp dec -838 if iox > -2054
+k dec -674 if q < -542
+i inc -23 if k < 692
+mxn inc -221 if sd != -302
+mxn inc -830 if mxn > -309
+km inc -283 if db > -7
+icg inc 365 if xdl > 1234
+q inc -23 if m < -702
+wm dec -507 if rz < -582
+j inc -501 if gi != -10
+um inc 274 if a > 689
+db inc 814 if xdl != 1250
+fxx dec -172 if db != 822
+wm dec 581 if kt <= -1323
+gi dec -715 if kt >= -1339
+f inc -209 if i >= -31
+q inc 933 if fxx > -1246
+mxn dec -227 if gi > 713
+fxx dec -112 if xdl <= 1252
+hey dec -998 if xtz >= -781
+lp dec -743 if ms <= 4
+icg dec -581 if fxx > -1149
+gus inc 725 if k != 698
+icg dec 156 if kt != -1339
+gus dec 961 if i > -32
+giq dec -992 if kt <= -1327
+m inc -477 if xdl >= 1240
+db dec -258 if gus <= -424
+wm inc -72 if gi > 713
+i dec 923 if lp == 1581
+m inc -221 if iox == -2044
+j inc 410 if m < -1402
+kt inc 838 if a == 685
+i dec 528 if gi < 712
+iox dec -823 if i >= -952
+a dec -705 if icg > 799
+gi dec -538 if db > 1079
+xdl inc -507 if q > -571
+rz inc 37 if km > -546
+fxx dec -718 if ms <= -2
+xdl inc -742 if cl < 4
+q dec 591 if wm > 542
+a dec 100 if db != 1072
+fxx dec -392 if giq >= 579
+j inc 991 if i >= -942
+m inc 311 if sd != -296
+icg inc -286 if db != 1075
+m inc 906 if rz == -555
+um inc 150 if hey == 993
+rz inc -637 if fxx < -746
+ms dec 779 if f >= 751
+gus inc 928 if j != -100
+rz dec 769 if sd < -292
+xdl inc -556 if gus <= 505
+rz inc -94 if j < -82
+mxn dec -763 if cl == 0
+xdl dec -693 if gus <= 502
+db inc -879 if kt <= -1339
+w dec 651 if hey > 991
+um dec -898 if giq == 583
+xdl dec 501 if hey > 998
+wm dec 746 if lp < 1587
+iox inc 915 if um > 1251
+a inc 573 if q >= -1165
+j dec -459 if m <= -512
+km dec -601 if xdl >= 131
+km dec 801 if f >= 756
+ms inc 318 if j < -91
+hey dec -768 if i <= -945
+f inc -982 if xdl < 134
+i inc 210 if iox < -305
+icg inc -838 if xtz >= -784
+mxn dec 901 if f == -225
+m inc 601 if i <= -733
+iox inc -863 if cl >= -5
+ms dec -474 if db >= 1069
+xtz dec 708 if um >= 1253
+lp dec 0 if xdl < 130
+k inc -476 if sd <= -291
+um dec 475 if hey != 1756
+q inc 178 if k <= 215
+km dec 244 if a >= 1265
+j dec 485 if k < 209
+icg inc 429 if um >= 784
+ms inc -881 if kt > -1341
+cl inc -75 if iox < -1176
+icg dec -72 if gi == 715
+i inc 714 if lp >= 1572
+rz inc -881 if j >= -96
+ms dec -453 if i <= -29
+giq dec -500 if sd != -305
+sd dec -78 if lp != 1572
+a inc 313 if db == 1072
+w dec 97 if q == -978
+gus dec -203 if f != -225
+xdl dec -894 if j < -88
+q inc 71 if k != 213
+um dec -242 if wm > -207
+kt dec -997 if sd != -215
+cl dec 643 if lp != 1587
+hey inc -564 if fxx == -748
+ms dec 639 if m != 95
+ms dec 131 if w <= -3026
+xdl dec 241 if w != -3032
+mxn inc 404 if i == -28
+giq dec 111 if xdl >= 789
+wm inc 93 if j <= -88
+xdl inc 318 if um >= 1026
+gi dec -766 if a < 1587
+mxn inc 212 if w > -3040
+f dec -601 if giq == 1084
+m dec 135 if kt >= -334
+a dec -471 if rz >= -2940
+cl dec -379 if giq != 1080
+w inc -834 if db < 1077
+km inc -515 if f >= -226
+i inc 133 if a > 2043
+gus dec -368 if gi >= 1476
+db inc -629 if fxx > -758
+km inc -807 if a != 2052
+j dec -129 if cl > -267
+gi dec -443 if m <= -35
+kt dec -355 if sd != -218
+mxn inc -734 if xtz == -1488
+icg inc 468 if m == -34
+m inc 896 if iox <= -1168
+xdl inc -763 if j < 39
+db inc -51 if xdl >= 337
+sd dec 688 if icg >= 167
+w inc 307 if gi >= 1924
+ms inc 190 if xdl >= 331
+k inc 869 if fxx >= -750
+mxn inc -772 if ms >= -1771
+f inc -303 if q == -922
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+mxn dec 319 if mxn < -2644
+m dec 611 if f == -6798
+fxx dec -83 if icg < -639
+gi dec 567 if cl > -4830
+ms inc -95 if mxn < -2966
+um inc 862 if gus != 2215
+hey dec -341 if icg == -634
+iox dec 829 if f <= -6801
+giq dec 376 if kt == 1012
+lp dec -990 if um < -183
+iox inc -868 if kt >= 999
+iox dec -670 if f <= -6796
+fxx inc 895 if gus < 2209
+k inc -916 if q <= 873
+rz dec 646 if w >= -3747
+kt inc -807 if j == 1203
+fxx dec 568 if gi >= -43
+giq dec -966 if q < 877
+rz inc 250 if giq < -174
+iox inc -19 if i == 3212
+f inc -404 if k <= 1304
+gi dec -481 if kt >= 195
+giq dec -323 if gi < 424
+lp inc 873 if km >= 752
+icg dec 953 if um <= -182
+q dec 246 if db != 1942
+rz inc -987 if lp > 1307
+hey inc -728 if xtz <= -837
+fxx dec 743 if xtz != -843
+km dec 393 if km <= 740
+rz inc 635 if icg < -1578
+k dec -136 if km <= 742
+gus inc 715 if giq >= -185
+lp dec 782 if km >= 741
+ms dec -140 if sd != 1479
+iox inc -992 if sd != 1488
+wm inc 8 if ms >= -802
+giq dec 134 if xtz <= -830
+mxn dec 877 if xtz > -832
+lp inc -260 if ms > -815
+xdl inc 170 if w > -3742
+q inc -674 if gi != 434
+giq inc -760 if wm <= -1788
+km dec -96 if hey != 1802
+j inc 662 if fxx >= -1904
+gus dec 305 if a <= 1943
+db inc 881 if icg > -1583
+um inc -137 if rz >= -96
+mxn dec -755 if lp == 269
+lp inc -220 if hey > 1799
+cl inc 652 if xdl >= -1678
+gus inc -473 if a >= 1935
+k dec 80 if i != 3216
+gus inc 138 if xtz != -831
+mxn inc 654 if giq >= -1075
+xtz inc -677 if um >= -323
+cl inc -557 if hey >= 1807
+m dec 488 if lp == 49
+k inc -214 if q != -49
+k inc -584 if cl != -4727
+icg inc -423 if ms == -806
+gi dec -323 if fxx >= -1909
+ms dec -61 if giq != -1062
+wm dec 259 if q < -45
+f inc -634 if gi == 753
+iox inc 985 if gi > 750
+km dec -821 if db < 1950
+f inc 105 if gi < 763
+j inc -36 if q <= -44
+ms inc -244 if giq < -1063
+i dec 423 if cl == -4727
+kt dec 77 if sd == 1481
+db inc -779 if gi == 753
+gi dec -525 if iox <= -2985
+f dec 378 if rz != -86
+mxn dec 479 if km < 1671
+f inc -812 if kt > 118
+db inc -121 if kt < 128
+w inc 957 if mxn == -2042
+db inc -97 if mxn != -2052
+km inc 521 if q < -46
+a dec -669 if i >= 2783
+icg inc 47 if km > 2176
+gi inc 459 if gi != 760
+mxn dec 810 if hey >= 1803
+ms inc -896 if xtz != -1522
+fxx inc 331 if cl == -4727
+hey dec 104 if sd < 1482
+f dec -684 if f < -8923
+xtz dec 893 if giq > -1080
+um dec -749 if db < 962
+rz inc 823 if sd <= 1484
+a inc 4 if w > -2793
+cl dec -559 if a > 2614
+iox dec 116 if db <= 956
+cl dec -384 if gus == 2291
+lp inc 522 if kt > 118
+icg dec -250 if km <= 2186
+j inc -144 if mxn > -2843
+kt dec -682 if ms > -1891
+gi inc -320 if sd < 1489
+iox dec -955 if kt != 802
+mxn dec 949 if lp > 570
+mxn dec -84 if wm > -2050
+xtz dec 762 if kt == 802
+wm dec -74 if um != 422
+m inc -948 if gi >= 889
+w inc 90 if w != -2792
+j dec -516 if fxx <= -1568
+cl inc -457 if k <= 1232
+ms dec -288 if w != -2792
+ms inc 57 if db >= 946
+a dec -481 if w >= -2800
+icg dec -210 if ms != -1827
+giq inc 323 if a != 3098
+ms inc -646 if iox <= -3090
+mxn dec -390 if lp > 565
+db dec 634 if hey >= 1701
+iox inc 357 if w >= -2799
+hey inc 434 if icg != -1503
+um dec 763 if xtz == -3168
+giq dec 742 if m != -5115
+giq inc -645 if db < 318
+f inc -832 if ms == -2474
+xtz dec 921 if w > -2799
+f dec -259 if xtz <= -4086
+mxn dec -689 if ms == -2468
+kt inc -725 if iox != -2732
+sd inc -586 if rz <= 730
+w dec 94 if xdl > -1682
+lp inc -793 if km > 2185
+cl inc -764 if j < 2348
+lp dec 656 if fxx != -1577
+f dec -892 if db > 319
+i inc -441 if k <= 1230
+db dec 935 if q == -49
+q dec -926 if xtz > -4094
+q inc 729 if fxx == -1572
+lp inc 115 if k != 1233
+j dec -252 if mxn == -3318
+w inc 695 if gi <= 891
+j dec -721 if gi < 899
+sd dec -132 if sd == 896
+cl inc 856 if icg == -1503
+giq inc -142 if k >= 1218
+iox inc -328 if db <= -617
+db inc -199 if wm >= -1981
+km dec -364 if j == 3066
+cl dec -659 if sd >= 891
+xtz inc -207 if giq == -1632
+cl inc 928 if i <= 2339
+giq inc -897 if km != 2544
+mxn inc -61 if xdl > -1679
+f inc 953 if lp >= 30
+f dec -450 if giq > -2535
+w dec -962 if kt >= 68
+gi inc 317 if km < 2556
+kt dec -271 if k >= 1231
+iox dec 238 if i <= 2352
+xtz inc -840 if ms <= -2467
+giq dec 905 if f >= -8097
+kt dec 484 if icg <= -1502
+lp dec 675 if km >= 2539
+ms inc 772 if j <= 3073
+ms dec 297 if q > 1604
+kt inc 465 if hey > 1701
+w inc 987 if kt > 50
+xtz dec 180 if q == 1606
+um dec -823 if gus != 2284
+hey inc -964 if um == 487
+kt inc 387 if cl > -4046
+cl dec -167 if gi == 1209
diff --git a/2017/d09/ex1/ex1.py b/2017/d09/ex1/ex1.py
new file mode 100755
index 0000000..3f71671
--- /dev/null
+++ b/2017/d09/ex1/ex1.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Group(NamedTuple):
+    children: list["Group"]
+
+
+def solve(input: str) -> int:
+    def parse_group(input: str) -> tuple[Group, str]:
+        garbage = False
+        cancel = False
+        stack: list[Group] = []
+        for i, c in enumerate(input):
+            if cancel:
+                assert garbage  # Sanity check
+                cancel = False
+                continue
+            if garbage:
+                if c == "!":
+                    cancel = True
+                elif c == ">":
+                    garbage = False
+                continue
+            if c == "<":
+                garbage = True
+                continue
+            if c == "{":
+                stack.append(Group([]))
+                continue
+            if c == "}":
+                top = stack.pop()
+                if stack:
+                    stack[-1].children.append(top)
+                    continue
+                return top, input[i + 1 :]
+        assert False  # Sanity check
+
+    def parse(input: str) -> Group:
+        group, input = parse_group(input)
+        assert not input  # Sanity check
+        return group
+
+    def compute_score(group: Group) -> int:
+        def helper(group: Group, depth: int) -> int:
+            return depth + sum(helper(child, depth + 1) for child in group.children)
+
+        return helper(group, 1)
+
+    groups = parse(input.strip())
+    return compute_score(groups)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d09/ex1/input b/2017/d09/ex1/input
new file mode 100644
index 0000000..686a0e1
--- /dev/null
+++ b/2017/d09/ex1/input
@@ -0,0 +1 @@
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diff --git a/2017/d09/ex2/ex2.py b/2017/d09/ex2/ex2.py
new file mode 100755
index 0000000..60b5a6f
--- /dev/null
+++ b/2017/d09/ex2/ex2.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Group(NamedTuple):
+    children: list["Group"]
+
+
+def solve(input: str) -> int:
+    def parse_group(input: str) -> tuple[Group, str, int]:
+        garbage = False
+        cancel = False
+        stack: list[Group] = []
+        total_garbage = 0
+        for i, c in enumerate(input):
+            if cancel:
+                assert garbage  # Sanity check
+                cancel = False
+                continue
+            if garbage:
+                if c == "!":
+                    cancel = True
+                elif c == ">":
+                    garbage = False
+                else:
+                    total_garbage += 1
+                continue
+            if c == "<":
+                garbage = True
+                continue
+            if c == "{":
+                stack.append(Group([]))
+                continue
+            if c == "}":
+                top = stack.pop()
+                if stack:
+                    stack[-1].children.append(top)
+                    continue
+                return top, input[i + 1 :], total_garbage
+        assert False  # Sanity check
+
+    def parse(input: str) -> tuple[Group, int]:
+        groups, input, total_garbage = parse_group(input)
+        assert not input  # Sanity check
+        return groups, total_garbage
+
+    _, total_garbage = parse(input.strip())
+    return total_garbage
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d09/ex2/input b/2017/d09/ex2/input
new file mode 100644
index 0000000..686a0e1
--- /dev/null
+++ b/2017/d09/ex2/input
@@ -0,0 +1 @@
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diff --git a/2017/d10/ex1/ex1.py b/2017/d10/ex1/ex1.py
new file mode 100755
index 0000000..6e8576c
--- /dev/null
+++ b/2017/d10/ex1/ex1.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+import copy
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[int]:
+        return [int(n) for n in input.split(",")]
+
+    def run_round(lengths: list[int], circle: list[int]) -> list[int]:
+        circle = copy.deepcopy(circle)
+        cur_pos = 0
+        skip_size = 0
+        for n in lengths:
+            # Invalid length
+            if n > len(circle):
+                continue
+            # Reverse
+            for i, j in zip(
+                range(cur_pos, cur_pos + n // 2),
+                # Avoid off-by-one by going further than necessary
+                range(cur_pos + n - 1, cur_pos, -1),
+            ):
+                i %= len(circle)
+                j %= len(circle)
+                circle[i], circle[j] = circle[j], circle[i]
+            # Move
+            cur_pos += n + skip_size
+            # Increase
+            skip_size += 1
+        return circle
+
+    lengths = parse(input)
+    circle = list(range(256))
+    circle = run_round(lengths, circle)
+    return circle[0] * circle[1]
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d10/ex1/input b/2017/d10/ex1/input
new file mode 100644
index 0000000..c4486d6
--- /dev/null
+++ b/2017/d10/ex1/input
@@ -0,0 +1 @@
+83,0,193,1,254,237,187,40,88,27,2,255,149,29,42,100
diff --git a/2017/d10/ex2/ex2.py b/2017/d10/ex2/ex2.py
new file mode 100755
index 0000000..f547893
--- /dev/null
+++ b/2017/d10/ex2/ex2.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+import functools
+import itertools
+import operator
+import sys
+
+
+def solve(input: str) -> str:
+    def parse(input: str) -> list[int]:
+        return [ord(c) for c in input.strip()]
+
+    def compute_sparse_hash(lengths: list[int]) -> list[int]:
+        circle = list(range(256))
+        cur_pos, skip_size = 0, 0
+        for _ in range(64):
+            for n in lengths:
+                # Invalid length
+                assert n < len(circle)  # Sanity check
+                # Reverse
+                for i, j in zip(
+                    range(cur_pos, cur_pos + n // 2),
+                    # Avoid off-by-one by going further than necessary
+                    range(cur_pos + n - 1, cur_pos, -1),
+                ):
+                    i %= len(circle)
+                    j %= len(circle)
+                    circle[i], circle[j] = circle[j], circle[i]
+                # Move
+                cur_pos += n + skip_size
+                # Increase
+                skip_size += 1
+        return circle
+
+    def compute_dense_hash(sparse_hash: list[int]) -> list[int]:
+        assert len(sparse_hash) == 256  # Sanity check
+        return [
+            functools.reduce(operator.xor, chunk)
+            for chunk in itertools.batched(sparse_hash, 16)
+        ]
+
+    lengths = parse(input)
+    lengths += [17, 31, 73, 47, 23]  # Additional lengths
+    sparse_hash = compute_sparse_hash(lengths)
+    dense_hash = compute_dense_hash(sparse_hash)
+    return "".join(f"{n:02x}" for n in dense_hash)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d10/ex2/input b/2017/d10/ex2/input
new file mode 100644
index 0000000..c4486d6
--- /dev/null
+++ b/2017/d10/ex2/input
@@ -0,0 +1 @@
+83,0,193,1,254,237,187,40,88,27,2,255,149,29,42,100
diff --git a/2017/d11/ex1/ex1.py b/2017/d11/ex1/ex1.py
new file mode 100755
index 0000000..bb0ef3f
--- /dev/null
+++ b/2017/d11/ex1/ex1.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.StrEnum):
+    NORTH_WEST = "nw"
+    NORTH = "n"
+    NORTH_EAST = "ne"
+    SOUTH_EAST = "se"
+    SOUTH = "s"
+    SOUTH_WEST = "sw"
+
+    # https://www.redblobgames.com/grids/hexagons/#coordinates-axial
+    def apply(self, p: Point) -> Point:
+        # (x, y) <=> (q, r)
+        match self:
+            case Direction.NORTH_WEST:
+                dx, dy = -1, 0
+            case Direction.NORTH:
+                dx, dy = 0, -1
+            case Direction.NORTH_EAST:
+                dx, dy = 1, -1
+            case Direction.SOUTH_EAST:
+                dx, dy = 1, 0
+            case Direction.SOUTH:
+                dx, dy = 0, 1
+            case Direction.SOUTH_WEST:
+                dx, dy = -1, 1
+        return Point(p.x + dx, p.y + dy)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Direction]:
+        return [Direction(dir) for dir in input.strip().split(",")]
+
+    # https://www.redblobgames.com/grids/hexagons/#distances-axial
+    def hex_dist(a: Point, b: Point) -> int:
+        dx, dy = a.x - b.x, a.y - b.y
+        return (abs(dx) + abs(dx + dy) + abs(dy)) // 2
+
+    directions = parse(input)
+    pos = Point(0, 0)
+    for dir in directions:
+        pos = dir.apply(pos)
+    return hex_dist(Point(0, 0), pos)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d11/ex1/input b/2017/d11/ex1/input
new file mode 100644
index 0000000..093ccc2
--- /dev/null
+++ b/2017/d11/ex1/input
@@ -0,0 +1 @@
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diff --git a/2017/d11/ex2/ex2.py b/2017/d11/ex2/ex2.py
new file mode 100755
index 0000000..9355eaa
--- /dev/null
+++ b/2017/d11/ex2/ex2.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+
+import enum
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.StrEnum):
+    NORTH_WEST = "nw"
+    NORTH = "n"
+    NORTH_EAST = "ne"
+    SOUTH_EAST = "se"
+    SOUTH = "s"
+    SOUTH_WEST = "sw"
+
+    # https://www.redblobgames.com/grids/hexagons/#coordinates-axial
+    def apply(self, p: Point) -> Point:
+        # (x, y) <=> (q, r)
+        match self:
+            case Direction.NORTH_WEST:
+                dx, dy = -1, 0
+            case Direction.NORTH:
+                dx, dy = 0, -1
+            case Direction.NORTH_EAST:
+                dx, dy = 1, -1
+            case Direction.SOUTH_EAST:
+                dx, dy = 1, 0
+            case Direction.SOUTH:
+                dx, dy = 0, 1
+            case Direction.SOUTH_WEST:
+                dx, dy = -1, 1
+        return Point(p.x + dx, p.y + dy)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Direction]:
+        return [Direction(dir) for dir in input.strip().split(",")]
+
+    # https://www.redblobgames.com/grids/hexagons/#distances-axial
+    def hex_dist(a: Point, b: Point) -> int:
+        dx, dy = a.x - b.x, a.y - b.y
+        return (abs(dx) + abs(dx + dy) + abs(dy)) // 2
+
+    def walk(directions: list[Direction]) -> Iterator[Point]:
+        pos = Point(0, 0)
+        for dir in directions:
+            pos = dir.apply(pos)
+            yield pos
+
+    directions = parse(input)
+    return max(hex_dist(p, Point(0, 0)) for p in walk(directions))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d11/ex2/input b/2017/d11/ex2/input
new file mode 100644
index 0000000..093ccc2
--- /dev/null
+++ b/2017/d11/ex2/input
@@ -0,0 +1 @@
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diff --git a/2017/d12/ex1/ex1.py b/2017/d12/ex1/ex1.py
new file mode 100755
index 0000000..fc720bb
--- /dev/null
+++ b/2017/d12/ex1/ex1.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse_line(input: str) -> tuple[int, set[int]]:
+        origin, others = input.split(" <-> ")
+        return int(origin), {int(n) for n in others.split(", ")}
+
+    def parse(input: str) -> dict[int, set[int]]:
+        return {n: children for n, children in map(parse_line, input.splitlines())}
+
+    def reachable(graph: dict[int, set[int]]) -> int:
+        queue = [0]
+        seen: set[int] = set()
+
+        while queue:
+            n = queue.pop()
+            if n in seen:
+                continue
+            seen.add(n)
+            queue.extend(graph[n])
+
+        return len(seen)
+
+    graph = parse(input)
+    return reachable(graph)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d12/ex1/input b/2017/d12/ex1/input
new file mode 100644
index 0000000..80e4ce6
--- /dev/null
+++ b/2017/d12/ex1/input
@@ -0,0 +1,2000 @@
+0 <-> 199, 1774
+1 <-> 350, 1328, 1920
+2 <-> 477, 984, 1419
+3 <-> 1465, 1568
+4 <-> 359, 1047, 1215, 1580, 1969
+5 <-> 613
+6 <-> 49, 617, 1213
+7 <-> 1263
+8 <-> 410
+9 <-> 1224
+10 <-> 1157
+11 <-> 304, 1168, 1875
+12 <-> 868, 891, 1369, 1712
+13 <-> 958, 1371
+14 <-> 1814
+15 <-> 261, 556
+16 <-> 830, 1646, 1901, 1933
+17 <-> 962, 1778
+18 <-> 109, 1229
+19 <-> 239, 1070, 1886, 1930
+20 <-> 327, 1307, 1801, 1905
+21 <-> 943, 1950
+22 <-> 1310
+23 <-> 659, 917
+24 <-> 373
+25 <-> 369
+26 <-> 947, 1023
+27 <-> 338, 1901
+28 <-> 1691
+29 <-> 132, 1219, 1699, 1962
+30 <-> 424, 822, 1419
+31 <-> 1444, 1464
+32 <-> 702, 1517
+33 <-> 1639
+34 <-> 909
+35 <-> 690, 1655
+36 <-> 988, 1149, 1166
+37 <-> 649, 1300, 1441, 1699
+38 <-> 1848
+39 <-> 382
+40 <-> 827, 1203, 1510
+41 <-> 714, 1056, 1184
+42 <-> 1018, 1873
+43 <-> 214
+44 <-> 670, 957
+45 <-> 45
+46 <-> 1195
+47 <-> 559, 1504
+48 <-> 1958
+49 <-> 6
+50 <-> 50, 1248
+51 <-> 1151
+52 <-> 52, 521, 1791
+53 <-> 304
+54 <-> 601
+55 <-> 1328
+56 <-> 939
+57 <-> 1583, 1995
+58 <-> 1422, 1694
+59 <-> 395, 1233
+60 <-> 862, 1811
+61 <-> 345, 1694
+62 <-> 62, 276
+63 <-> 280
+64 <-> 199
+65 <-> 117, 930
+66 <-> 364, 697
+67 <-> 1043
+68 <-> 287, 504, 1554
+69 <-> 498, 706
+70 <-> 77, 333, 713, 972, 1299
+71 <-> 1643
+72 <-> 694
+73 <-> 1381
+74 <-> 955, 1790
+75 <-> 1691, 1743
+76 <-> 76, 638, 1429
+77 <-> 70
+78 <-> 1513
+79 <-> 1397, 1716
+80 <-> 897
+81 <-> 968, 1841
+82 <-> 649
+83 <-> 522
+84 <-> 84, 125, 399, 498
+85 <-> 880, 1554, 1888
+86 <-> 86
+87 <-> 579, 1947
+88 <-> 470, 1451, 1750
+89 <-> 805, 1434
+90 <-> 453
+91 <-> 1208
+92 <-> 688, 1358, 1746
+93 <-> 357, 647
+94 <-> 234, 1270, 1520
+95 <-> 620, 1454
+96 <-> 390, 869, 919
+97 <-> 693, 1783
+98 <-> 259, 529, 782, 1018
+99 <-> 678
+100 <-> 1215
+101 <-> 459, 887
+102 <-> 888, 1135
+103 <-> 1006
+104 <-> 1375, 1422
+105 <-> 1657, 1730
+106 <-> 216, 1434
+107 <-> 333
+108 <-> 468, 1654
+109 <-> 18, 1791
+110 <-> 372
+111 <-> 111, 861, 1383
+112 <-> 1359, 1937
+113 <-> 414, 736, 1446
+114 <-> 426, 1457
+115 <-> 1605, 1672
+116 <-> 116, 713, 1584, 1602
+117 <-> 65
+118 <-> 1611, 1897
+119 <-> 541, 1569
+120 <-> 412, 787
+121 <-> 1344
+122 <-> 698, 752, 1693
+123 <-> 1173, 1576, 1634, 1802
+124 <-> 735
+125 <-> 84, 1032
+126 <-> 126, 225, 332
+127 <-> 1350
+128 <-> 128, 319, 327, 1582
+129 <-> 129, 654, 1260
+130 <-> 1080, 1296, 1350
+131 <-> 131
+132 <-> 29, 856, 1064
+133 <-> 659, 1367, 1776
+134 <-> 648, 1147, 1450, 1910
+135 <-> 411
+136 <-> 353, 935, 1590
+137 <-> 228
+138 <-> 194, 452, 1746, 1794
+139 <-> 139, 494, 1635
+140 <-> 681
+141 <-> 1507
+142 <-> 1288
+143 <-> 845
+144 <-> 1516
+145 <-> 502, 1146, 1155, 1809
+146 <-> 146, 750
+147 <-> 1600
+148 <-> 1206
+149 <-> 829, 1457
+150 <-> 675, 915
+151 <-> 651, 1678
+152 <-> 888, 1503
+153 <-> 498, 960, 1515
+154 <-> 1468
+155 <-> 751
+156 <-> 528, 803, 1655
+157 <-> 1486, 1937
+158 <-> 590, 1876
+159 <-> 159, 185, 1287, 1550, 1588
+160 <-> 160, 548
+161 <-> 1303, 1364
+162 <-> 1855
+163 <-> 1181
+164 <-> 442
+165 <-> 490
+166 <-> 1105
+167 <-> 1121
+168 <-> 760, 1129
+169 <-> 747
+170 <-> 1890
+171 <-> 1644
+172 <-> 593, 665
+173 <-> 1092, 1869
+174 <-> 705
+175 <-> 1345, 1999
+176 <-> 234, 606
+177 <-> 557, 688
+178 <-> 373
+179 <-> 1376
+180 <-> 638
+181 <-> 1996
+182 <-> 1094, 1206, 1748
+183 <-> 931
+184 <-> 880
+185 <-> 159, 1058, 1704
+186 <-> 765, 1178, 1877
+187 <-> 732
+188 <-> 188
+189 <-> 189, 1871
+190 <-> 395, 1639
+191 <-> 441
+192 <-> 192, 1034
+193 <-> 494
+194 <-> 138, 995, 1308
+195 <-> 1024
+196 <-> 226, 1632, 1919
+197 <-> 786
+198 <-> 286, 758, 1852
+199 <-> 0, 64, 1646
+200 <-> 314
+201 <-> 459, 658
+202 <-> 321, 492, 599, 1081, 1460
+203 <-> 225
+204 <-> 331, 462, 600
+205 <-> 898
+206 <-> 734, 1321
+207 <-> 558, 991
+208 <-> 397
+209 <-> 1145, 1886
+210 <-> 1343, 1925
+211 <-> 840, 1409
+212 <-> 1308
+213 <-> 1813
+214 <-> 43, 282
+215 <-> 1270
+216 <-> 106, 836, 1275, 1507
+217 <-> 312
+218 <-> 290, 386, 639, 1920
+219 <-> 784, 1001
+220 <-> 220, 322
+221 <-> 1681
+222 <-> 1616, 1653
+223 <-> 436, 1272, 1625
+224 <-> 1398, 1696
+225 <-> 126, 203, 1182
+226 <-> 196, 1655
+227 <-> 623
+228 <-> 137, 923
+229 <-> 253, 1387
+230 <-> 1374
+231 <-> 389, 1499
+232 <-> 442
+233 <-> 473, 1406
+234 <-> 94, 176
+235 <-> 235
+236 <-> 607, 838, 1487, 1856
+237 <-> 818
+238 <-> 387, 628
+239 <-> 19
+240 <-> 818
+241 <-> 1027, 1524
+242 <-> 1085, 1971
+243 <-> 1942
+244 <-> 299, 390, 916
+245 <-> 906
+246 <-> 246, 534, 763, 1427
+247 <-> 531, 1675
+248 <-> 336, 1832
+249 <-> 1497
+250 <-> 1836
+251 <-> 1309
+252 <-> 581, 1104
+253 <-> 229, 877, 1743
+254 <-> 254, 621
+255 <-> 831, 866, 874
+256 <-> 1942
+257 <-> 906
+258 <-> 1224
+259 <-> 98, 316, 419, 718, 1519
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+1816 <-> 1049, 1640
+1817 <-> 388
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+1819 <-> 1008
+1820 <-> 403
+1821 <-> 350, 1163
+1822 <-> 669, 1179, 1927
+1823 <-> 1323
+1824 <-> 667, 824, 1879
+1825 <-> 608, 839, 876, 1965
+1826 <-> 473, 907
+1827 <-> 1115, 1171
+1828 <-> 440, 1195, 1284, 1913
+1829 <-> 275, 1688, 1789
+1830 <-> 1830
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+1833 <-> 1833
+1834 <-> 1190
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+1836 <-> 250, 1836
+1837 <-> 577, 1970
+1838 <-> 1156, 1261
+1839 <-> 1192, 1244, 1298
+1840 <-> 1356
+1841 <-> 81
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+1843 <-> 1843
+1844 <-> 383, 1257, 1643
+1845 <-> 260, 451
+1846 <-> 1552
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+1848 <-> 38, 1739
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+1852 <-> 198, 1569
+1853 <-> 718, 1178, 1387
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+1855 <-> 162, 734, 1663
+1856 <-> 236, 751
+1857 <-> 1371
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+1861 <-> 1014, 1795
+1862 <-> 1142, 1252
+1863 <-> 281
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+1865 <-> 1865
+1866 <-> 574, 602, 1394, 1575
+1867 <-> 707, 1011
+1868 <-> 659, 1868
+1869 <-> 173, 1991
+1870 <-> 391, 828, 956, 1880
+1871 <-> 189, 692
+1872 <-> 1630
+1873 <-> 42, 1753
+1874 <-> 883
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+1876 <-> 158
+1877 <-> 186
+1878 <-> 796, 1385
+1879 <-> 486, 1824
+1880 <-> 920, 1870
+1881 <-> 433, 573, 905
+1882 <-> 625, 1954
+1883 <-> 300, 1700
+1884 <-> 1884
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+1886 <-> 19, 209, 1300, 1594
+1887 <-> 277
+1888 <-> 85
+1889 <-> 489, 1286, 1562
+1890 <-> 170, 832
+1891 <-> 1211, 1592, 1973
+1892 <-> 611, 697, 914
+1893 <-> 1224
+1894 <-> 775, 1601
+1895 <-> 308, 323, 618
+1896 <-> 1106
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+1898 <-> 1316, 1560, 1944
+1899 <-> 463, 1050
+1900 <-> 1088, 1690, 1951
+1901 <-> 16, 27
+1902 <-> 981, 1714
+1903 <-> 1380
+1904 <-> 278, 1052
+1905 <-> 20
+1906 <-> 671, 1225, 1780
+1907 <-> 800
+1908 <-> 583
+1909 <-> 1361, 1940
+1910 <-> 134, 967, 1545
+1911 <-> 1973
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+1913 <-> 832, 1426, 1729, 1828
+1914 <-> 1914
+1915 <-> 1399, 1589
+1916 <-> 650, 1916
+1917 <-> 726, 1917
+1918 <-> 1040
+1919 <-> 196, 1378, 1919
+1920 <-> 1, 218
+1921 <-> 1670, 1952
+1922 <-> 1381
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+1924 <-> 373, 904
+1925 <-> 210, 1935
+1926 <-> 543, 1013, 1805
+1927 <-> 1102, 1822
+1928 <-> 346, 1928
+1929 <-> 1661
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+1933 <-> 16, 1190, 1627, 1933
+1934 <-> 288, 1243
+1935 <-> 535, 1697, 1925
+1936 <-> 295
+1937 <-> 112, 157, 1728
+1938 <-> 293
+1939 <-> 689, 1059, 1463
+1940 <-> 616, 1909
+1941 <-> 1764
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+1945 <-> 1504
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+1953 <-> 1067
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+1955 <-> 754
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+1958 <-> 48, 708, 1696
+1959 <-> 1959
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+1965 <-> 1825
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+1968 <-> 265, 475
+1969 <-> 4, 1781
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+1971 <-> 242, 545, 1971
+1972 <-> 1972
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+1974 <-> 885
+1975 <-> 1196, 1669
+1976 <-> 1709
+1977 <-> 1977
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+1981 <-> 1793
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+1984 <-> 731, 1652
+1985 <-> 1355
+1986 <-> 795
+1987 <-> 1573, 1676
+1988 <-> 495, 1023, 1433
+1989 <-> 1617, 1762
+1990 <-> 376
+1991 <-> 1869
+1992 <-> 1035, 1655
+1993 <-> 1411
+1994 <-> 1235, 1994
+1995 <-> 57, 1209, 1572
+1996 <-> 181, 1815
+1997 <-> 395, 1436
+1998 <-> 1300
+1999 <-> 175, 1161
diff --git a/2017/d12/ex2/ex2.py b/2017/d12/ex2/ex2.py
new file mode 100755
index 0000000..c6c0fbf
--- /dev/null
+++ b/2017/d12/ex2/ex2.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+
+
+class UnionFind:
+    _parent: list[int]
+    _rank: list[int]
+
+    def __init__(self, size: int):
+        # Each node is in its own set, making it its own parent...
+        self._parent = list(range(size))
+        # ... And its rank 0
+        self._rank = [0] * size
+
+    def find(self, elem: int) -> int:
+        while (parent := self._parent[elem]) != elem:
+            # Replace each parent link by a link to the grand-parent
+            elem, self._parent[elem] = parent, self._parent[parent]
+        return elem
+
+    def union(self, lhs: int, rhs: int) -> int:
+        lhs = self.find(lhs)
+        rhs = self.find(rhs)
+        # Bail out early if they already belong to the same set
+        if lhs == rhs:
+            return lhs
+        # Always keep `lhs` as the taller tree
+        if self._rank[lhs] < self._rank[rhs]:
+            lhs, rhs = rhs, lhs
+        # Merge the smaller tree into the taller one
+        self._parent[rhs] = lhs
+        # Update the rank when merging trees of approximately the same size
+        if self._rank[lhs] == self._rank[rhs]:
+            self._rank[lhs] += 1
+        return lhs
+
+    def sets(self) -> dict[int, set[int]]:
+        res: dict[int, set[int]] = collections.defaultdict(set)
+        for elem in range(len(self._parent)):
+            res[self.find(elem)].add(elem)
+        return dict(res)
+
+
+def solve(input: str) -> int:
+    def parse_line(input: str) -> tuple[int, set[int]]:
+        origin, others = input.split(" <-> ")
+        return int(origin), {int(n) for n in others.split(", ")}
+
+    def parse(input: str) -> dict[int, set[int]]:
+        return {n: children for n, children in map(parse_line, input.splitlines())}
+
+    def count_groups(graph: dict[int, set[int]]) -> int:
+        uf = UnionFind(len(graph))
+        for n, children in graph.items():
+            for child in children:
+                uf.union(n, child)
+        return len(uf.sets())
+
+    graph = parse(input)
+    return count_groups(graph)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d12/ex2/input b/2017/d12/ex2/input
new file mode 100644
index 0000000..80e4ce6
--- /dev/null
+++ b/2017/d12/ex2/input
@@ -0,0 +1,2000 @@
+0 <-> 199, 1774
+1 <-> 350, 1328, 1920
+2 <-> 477, 984, 1419
+3 <-> 1465, 1568
+4 <-> 359, 1047, 1215, 1580, 1969
+5 <-> 613
+6 <-> 49, 617, 1213
+7 <-> 1263
+8 <-> 410
+9 <-> 1224
+10 <-> 1157
+11 <-> 304, 1168, 1875
+12 <-> 868, 891, 1369, 1712
+13 <-> 958, 1371
+14 <-> 1814
+15 <-> 261, 556
+16 <-> 830, 1646, 1901, 1933
+17 <-> 962, 1778
+18 <-> 109, 1229
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+205 <-> 898
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+214 <-> 43, 282
+215 <-> 1270
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+243 <-> 1942
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+260 <-> 1223, 1516, 1547, 1845, 1944
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+274 <-> 1427
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+276 <-> 62, 906
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+280 <-> 63, 280, 926, 931
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+285 <-> 746
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diff --git a/2017/d13/ex1/ex1.py b/2017/d13/ex1/ex1.py
new file mode 100755
index 0000000..3c23665
--- /dev/null
+++ b/2017/d13/ex1/ex1.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> dict[int, int]:
+        return {
+            depth: range
+            for depth, range in (map(int, l.split(": ")) for l in input.splitlines())
+        }
+
+    def would_catch(depth: int, range: int) -> bool:
+        cycle_length = (range - 1) * 2
+        return depth % cycle_length == 0
+
+    def compute_severity(firewall: dict[int, int]) -> int:
+        return sum(
+            depth * range
+            for depth, range in firewall.items()
+            if would_catch(depth, range)
+        )
+
+    firewall = parse(input)
+    return compute_severity(firewall)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d13/ex1/input b/2017/d13/ex1/input
new file mode 100644
index 0000000..269c1e7
--- /dev/null
+++ b/2017/d13/ex1/input
@@ -0,0 +1,44 @@
+0: 3
+1: 2
+2: 4
+4: 4
+6: 5
+8: 6
+10: 8
+12: 8
+14: 6
+16: 6
+18: 8
+20: 8
+22: 6
+24: 12
+26: 9
+28: 12
+30: 8
+32: 14
+34: 12
+36: 8
+38: 14
+40: 12
+42: 12
+44: 12
+46: 14
+48: 12
+50: 14
+52: 12
+54: 10
+56: 14
+58: 12
+60: 14
+62: 14
+66: 10
+68: 14
+74: 14
+76: 12
+78: 14
+80: 20
+86: 18
+92: 14
+94: 20
+96: 18
+98: 17
diff --git a/2017/d13/ex2/ex2.py b/2017/d13/ex2/ex2.py
new file mode 100755
index 0000000..3c146c3
--- /dev/null
+++ b/2017/d13/ex2/ex2.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> dict[int, int]:
+        return {
+            depth: range
+            for depth, range in (map(int, l.split(": ")) for l in input.splitlines())
+        }
+
+    def would_catch(depth: int, range: int, offset: int) -> bool:
+        cycle_length = (range - 1) * 2
+        return (depth + offset) % cycle_length == 0
+
+    def compute_delay(firewall: dict[int, int]) -> int:
+        for i in itertools.count():
+            if any(would_catch(depth, range, i) for depth, range in firewall.items()):
+                continue
+            return i
+        assert False  # Sanity check
+
+    firewall = parse(input)
+    return compute_delay(firewall)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d13/ex2/input b/2017/d13/ex2/input
new file mode 100644
index 0000000..269c1e7
--- /dev/null
+++ b/2017/d13/ex2/input
@@ -0,0 +1,44 @@
+0: 3
+1: 2
+2: 4
+4: 4
+6: 5
+8: 6
+10: 8
+12: 8
+14: 6
+16: 6
+18: 8
+20: 8
+22: 6
+24: 12
+26: 9
+28: 12
+30: 8
+32: 14
+34: 12
+36: 8
+38: 14
+40: 12
+42: 12
+44: 12
+46: 14
+48: 12
+50: 14
+52: 12
+54: 10
+56: 14
+58: 12
+60: 14
+62: 14
+66: 10
+68: 14
+74: 14
+76: 12
+78: 14
+80: 20
+86: 18
+92: 14
+94: 20
+96: 18
+98: 17
diff --git a/2017/d14/ex1/ex1.py b/2017/d14/ex1/ex1.py
new file mode 100755
index 0000000..0875b32
--- /dev/null
+++ b/2017/d14/ex1/ex1.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+import functools
+import itertools
+import operator
+import sys
+
+
+def solve(input: str) -> int:
+    def knot_hash(byte_string: str) -> str:
+        def compute_sparse_hash(lengths: list[int]) -> list[int]:
+            circle = list(range(256))
+            cur_pos, skip_size = 0, 0
+            for _ in range(64):
+                for n in lengths:
+                    # Invalid length
+                    assert n < len(circle)  # Sanity check
+                    # Reverse
+                    for i, j in zip(
+                        range(cur_pos, cur_pos + n // 2),
+                        # Avoid off-by-one by going further than necessary
+                        range(cur_pos + n - 1, cur_pos, -1),
+                    ):
+                        i %= len(circle)
+                        j %= len(circle)
+                        circle[i], circle[j] = circle[j], circle[i]
+                    # Move
+                    cur_pos += n + skip_size
+                    # Increase
+                    skip_size += 1
+            return circle
+
+        def compute_dense_hash(sparse_hash: list[int]) -> list[int]:
+            assert len(sparse_hash) == 256  # Sanity check
+            return [
+                functools.reduce(operator.xor, chunk)
+                for chunk in itertools.batched(sparse_hash, 16)
+            ]
+
+        lengths = [ord(c) for c in byte_string]
+        lengths += [17, 31, 73, 47, 23]  # Additional lengths
+        sparse_hash = compute_sparse_hash(lengths)
+        dense_hash = compute_dense_hash(sparse_hash)
+        return "".join(f"{n:02x}" for n in dense_hash)
+
+    input = input.strip()
+    hashes = [int(knot_hash(f"{input}-{i}"), 16) for i in range(128)]
+    return sum(n.bit_count() for n in hashes)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d14/ex1/input b/2017/d14/ex1/input
new file mode 100644
index 0000000..191abdd
--- /dev/null
+++ b/2017/d14/ex1/input
@@ -0,0 +1 @@
+hxtvlmkl
diff --git a/2017/d14/ex2/ex2.py b/2017/d14/ex2/ex2.py
new file mode 100755
index 0000000..0875507
--- /dev/null
+++ b/2017/d14/ex2/ex2.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python
+
+import collections
+import functools
+import itertools
+import operator
+import sys
+
+
+class UnionFind:
+    _parent: list[int]
+    _rank: list[int]
+
+    def __init__(self, size: int):
+        # Each node is in its own set, making it its own parent...
+        self._parent = list(range(size))
+        # ... And its rank 0
+        self._rank = [0] * size
+
+    def find(self, elem: int) -> int:
+        while (parent := self._parent[elem]) != elem:
+            # Replace each parent link by a link to the grand-parent
+            elem, self._parent[elem] = parent, self._parent[parent]
+        return elem
+
+    def union(self, lhs: int, rhs: int) -> int:
+        lhs = self.find(lhs)
+        rhs = self.find(rhs)
+        # Bail out early if they already belong to the same set
+        if lhs == rhs:
+            return lhs
+        # Always keep `lhs` as the taller tree
+        if self._rank[lhs] < self._rank[rhs]:
+            lhs, rhs = rhs, lhs
+        # Merge the smaller tree into the taller one
+        self._parent[rhs] = lhs
+        # Update the rank when merging trees of approximately the same size
+        if self._rank[lhs] == self._rank[rhs]:
+            self._rank[lhs] += 1
+        return lhs
+
+    def sets(self) -> dict[int, set[int]]:
+        res: dict[int, set[int]] = collections.defaultdict(set)
+        for elem in range(len(self._parent)):
+            res[self.find(elem)].add(elem)
+        return dict(res)
+
+
+def solve(input: str) -> int:
+    def knot_hash(byte_string: str) -> str:
+        def compute_sparse_hash(lengths: list[int]) -> list[int]:
+            circle = list(range(256))
+            cur_pos, skip_size = 0, 0
+            for _ in range(64):
+                for n in lengths:
+                    # Invalid length
+                    assert n < len(circle)  # Sanity check
+                    # Reverse
+                    for i, j in zip(
+                        range(cur_pos, cur_pos + n // 2),
+                        # Avoid off-by-one by going further than necessary
+                        range(cur_pos + n - 1, cur_pos, -1),
+                    ):
+                        i %= len(circle)
+                        j %= len(circle)
+                        circle[i], circle[j] = circle[j], circle[i]
+                    # Move
+                    cur_pos += n + skip_size
+                    # Increase
+                    skip_size += 1
+            return circle
+
+        def compute_dense_hash(sparse_hash: list[int]) -> list[int]:
+            assert len(sparse_hash) == 256  # Sanity check
+            return [
+                functools.reduce(operator.xor, chunk)
+                for chunk in itertools.batched(sparse_hash, 16)
+            ]
+
+        lengths = [ord(c) for c in byte_string]
+        lengths += [17, 31, 73, 47, 23]  # Additional lengths
+        sparse_hash = compute_sparse_hash(lengths)
+        dense_hash = compute_dense_hash(sparse_hash)
+        return "".join(f"{n:02x}" for n in dense_hash)
+
+    def count_regions(hashes: list[int]) -> int:
+        def occupied(row: int, bit: int) -> bool:
+            return (hashes[row] & 1 << bit) != 0
+
+        def key(row: int, bit: int) -> int:
+            return row * 128 + bit
+
+        def unkey(key: int) -> tuple[int, int]:
+            return key // 128, key % 128
+
+        uf = UnionFind(128 * 128)
+        for i in range(128):
+            for bit in range(128):
+                if not occupied(i, bit):
+                    continue
+                for ni, nbit in (
+                    (i - 1, bit),
+                    (i, bit - 1),
+                    (i + 1, bit),
+                    (i, bit + 1),
+                ):
+                    if ni < 0 or ni >= 128:
+                        continue
+                    if nbit < 0 or nbit >= 128:
+                        continue
+                    if not occupied(ni, nbit):
+                        continue
+                    uf.union(key(i, bit), key(ni, nbit))
+        # We created a UnionFind over *all* squares, only count *occupied* squares
+        return sum(occupied(*unkey(root)) for root in uf.sets())
+
+    input = input.strip()
+    hashes = [int(knot_hash(f"{input}-{i}"), 16) for i in range(128)]
+    return count_regions(hashes)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d14/ex2/input b/2017/d14/ex2/input
new file mode 100644
index 0000000..191abdd
--- /dev/null
+++ b/2017/d14/ex2/input
@@ -0,0 +1 @@
+hxtvlmkl
diff --git a/2017/d15/ex1/ex1.py b/2017/d15/ex1/ex1.py
new file mode 100755
index 0000000..24bd9ba
--- /dev/null
+++ b/2017/d15/ex1/ex1.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+import functools
+import itertools
+import sys
+from collections.abc import Iterator
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> tuple[int, int]:
+        a, b = input.splitlines()
+        return int(a.split()[-1]), int(b.split()[-1])
+
+    def generate(seed: int, factor: int) -> int:
+        seed *= factor
+        return seed % 2147483647
+
+    def judge(a: int, b: int) -> bool:
+        mask = (1 << 16) - 1
+        return (a & mask) == (b & mask)
+
+    def iter_judgements(seed_a: int, seed_b: int) -> Iterator[bool]:
+        generate_a = functools.partial(generate, factor=16807)
+        generate_b = functools.partial(generate, factor=48271)
+
+        while True:
+            seed_a, seed_b = generate_a(seed_a), generate_b(seed_b)
+            yield judge(seed_a, seed_b)
+
+    seed_a, seed_b = parse(input)
+    return sum(itertools.islice(iter_judgements(seed_a, seed_b), 40000000))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d15/ex1/input b/2017/d15/ex1/input
new file mode 100644
index 0000000..4cac76f
--- /dev/null
+++ b/2017/d15/ex1/input
@@ -0,0 +1,2 @@
+Generator A starts with 699
+Generator B starts with 124
diff --git a/2017/d15/ex2/ex2.py b/2017/d15/ex2/ex2.py
new file mode 100755
index 0000000..17eab8e
--- /dev/null
+++ b/2017/d15/ex2/ex2.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+import functools
+import itertools
+import sys
+from collections.abc import Iterator
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> tuple[int, int]:
+        a, b = input.splitlines()
+        return int(a.split()[-1]), int(b.split()[-1])
+
+    def generate(seed: int, factor: int, criteria: int) -> int:
+        while True:
+            seed *= factor
+            seed %= 2147483647
+            if (seed % criteria) == 0:
+                return seed
+
+    def judge(a: int, b: int) -> bool:
+        mask = (1 << 16) - 1
+        return (a & mask) == (b & mask)
+
+    def iter_judgements(seed_a: int, seed_b: int) -> Iterator[bool]:
+        generate_a = functools.partial(generate, factor=16807, criteria=4)
+        generate_b = functools.partial(generate, factor=48271, criteria=8)
+
+        while True:
+            seed_a, seed_b = generate_a(seed_a), generate_b(seed_b)
+            yield judge(seed_a, seed_b)
+
+    seed_a, seed_b = parse(input)
+    return sum(itertools.islice(iter_judgements(seed_a, seed_b), 5000000))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d15/ex2/input b/2017/d15/ex2/input
new file mode 100644
index 0000000..4cac76f
--- /dev/null
+++ b/2017/d15/ex2/input
@@ -0,0 +1,2 @@
+Generator A starts with 699
+Generator B starts with 124
diff --git a/2017/d16/ex1/ex1.py b/2017/d16/ex1/ex1.py
new file mode 100755
index 0000000..98d6107
--- /dev/null
+++ b/2017/d16/ex1/ex1.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Spin(NamedTuple):
+    n: int
+
+
+class Exchange(NamedTuple):
+    a: int
+    b: int
+
+
+class Partner(NamedTuple):
+    a: str
+    b: str
+
+
+Move = Spin | Exchange | Partner
+
+Programs = tuple[str, ...]
+
+
+def solve(input: str) -> str:
+    def parse_move(input: str) -> Move:
+        if input[0] == "s":
+            return Spin(int(input[1:]))
+        if input[0] == "x":
+            return Exchange(*map(int, input[1:].split("/")))
+        if input[0] == "p":
+            return Partner(*input[1:].split("/"))
+        assert False  # Sanity check
+
+    def parse(input: str) -> list[Move]:
+        return [parse_move(move) for move in input.strip().split(",")]
+
+    def apply_move(programs: Programs, move: Move) -> Programs:
+        match move:
+            case Spin(n):
+                return programs[-n:] + programs[:-n]
+            case Exchange(a, b):
+                tmp = list(programs)
+                tmp[a], tmp[b] = tmp[b], tmp[a]
+                return tuple(tmp)
+            case Partner(a, b):
+                ia, ib = programs.index(a), programs.index(b)
+                tmp = list(programs)
+                tmp[ia], tmp[ib] = tmp[ib], tmp[ia]
+                return tuple(tmp)
+
+    moves = parse(input)
+    programs = tuple(chr(ord("a") + i) for i in range(16))
+    for move in moves:
+        programs = apply_move(programs, move)
+    return "".join(programs)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d16/ex1/input b/2017/d16/ex1/input
new file mode 100644
index 0000000..205f5dc
--- /dev/null
+++ b/2017/d16/ex1/input
@@ -0,0 +1 @@
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pk/p,x3/4,s2,x6/7,pf/b,x0/3,pl/j,x11/1,pg/b,s7,x15/10,s6,x1/12,s8,x9/3,pj/a,x13/11,s2,x9/3,s6,x5/7,pd/e,x6/8,s15,x3/0,s12,x4/2,pg/j,s7,pe/b,x12/0,pj/h,s5,x2/9,s12,x15/6,pm/b,x11/4,s10,x2/8,s8,x9/3,s7,x11/5,pk/c,x6/3,s12,x10/0,s14,x15/5,pi/b,s11,x3/4,s2,x13/14,s11,x6/12,s15,x2/5,pp/d,x4/7,s15,x14/8,s1,x3/12,s11,x0/14,s13,x12/5,pj/i,x2/15,pa/f,x9/8,s1,x14/10,s4,x1/2,pc/l,x14/9,s8,x7/10,s5,x1/3,pk/g,x9/14,s12,x11/7,s5,x10/8,s15,x15/9,ph/l,x2/1,s14,x11/4,s10,x6/5,s14,x7/14,s3,pf/b,x4/15,pd/k,x13/1,s6,x6/9,s4,x12/15,s6,x1/13,s4,x11/2,pf/h,x4/12,s4,x9/10,s2,pn/l,x1/8,s10,x9/15,s8,x2/6,pi/g,x4/13,s7,x15/0,pn/j,x7/13,s2,x0/11,s6,x9/4,po/i,x13/10,s5,x3/0,s10,x8/7,s8,x0/12,s13,x4/3,s1,x2/5,s3,x8/15,s8,x0/10,pe/k,s7,x8/15,s6,pd/p,x3/6,s5,x15/1,ph/o,x10/0,pc/l,x15/14,s8,x6/12,s6,x15/5,pi/e,x1/11,s6,x3/5,s5,x2/11,s3,pl/k,x15/1,s14,x3/12,s1,x5/0,pn/h,x8/7,pd/p,s12,x5/15,pm/j,x4/6,s11,x10/9,pk/a,s4,x13/0,s12,x6/5,s5,x14/8,s11,x15/7,s2,x14/4,s11,pd/h,x11/15,s3,x2/1,pc/o,x0/8,s15,x15/3,pl/m,x7/6,pi/j,x4/14,s2,pg/d,s13,x13/3,s11,x5/10,pc/b,x2/8,s13,x14/1,pj/d,x11/8,po/i,x3/13,s1,x1/11,s10,x7/0,pg/p,x3/13,pa/c,x4/6,s7,x0/9,ph/p,x14/15,s7,x0/5,s5,x13/7,s3,x5/0,pd/l,s4,x1/13,s10,pn/b,x6/15,s1,x3/11,s8,x8/9,pc/e,s5,x12/11,s4,x14/13,pj/d,x9/0,s5,x13/11,pm/c,x3/0,s9,x2/1,pb/k,x14/7,s4,x8/4,s2,pj/l,x9/13,s12,x0/12,po/e,x6/5,pb/n,x12/11,s2,x4/3,s7,x6/12,pm/g,x3/15,s4,x2/9,pj/h,x13/7,s14,x4/10,s2,x11/12,pe/n,x14/10,s2,pl/c,s1,x2/8,s9,x0/9,s7,x13/6,s13,x7/11,ph/k,x15/1,pn/a,x12/3,s13,x10/11,s10,x8/15,pd/o,x3/11,pf/g,x7/12,pn/b,x14/13,po/f,x10/8,s5,x11/15,s2,x6/10,s15,x14/0,s4,x5/15,pm/k,x0/11,pl/j,x10/4,pn/f,s3,pj/m,x14/2,s5,x10/13,s9,x15/14,s13,x2/8,s4,x1/15,pl/k,x9/6,s5,x14/7,s1,x13/1,pi/a,x10/11,s4,pb/g,x1/0,pm/j,x6/12,s12,x2/3,s12,x0/12,s11,x10/5,pd/f,x15/4,s7,x2/0,s4,x6/5,s8,x10/8,s5,x3/12,pj/h,x2/11,s14,x6/1,s6,x8/12,po/a,s6,x2/5,s14,x13/7,pi/j,x15/6,pa/o,x0/1,pb/n,x9/2,pd/j,x12/13,s5,x4/14,s12,ph/f,x1/12,pm/d,x11/10,pn/i,x12/9,s8,x13/15,po/b,x11/12,s11,pj/p,x9/4,s3,x14/1,pk/c,x7/6,s8,x11/0,s1,po/i,x1/15,s6,pc/l,x11/9,s7,x15/2,s14,pi/p,s10,x9/4,s10,x7/12,pn/c,x11/4,s14,x9/3,pm/j,x8/6,pd/l,x3/9,ph/a,x2/15,s3,x5/9,s15,x4/1,pn/f,x10/11,ph/i,x5/0,pa/l,x15/9,s1,x2/8,s3,x1/14,s13,x10/4,s11,x3/0,pb/k,s5,x12/11,po/a,x3/4,s9,x8/14,s5,x9/12,s6,x3/5,s14,pl/k,s4,x6/9,pf/m,x10/14,s2,x2/9,pb/d,x11/4,pf/e,x5/1,s12,x9/12,s3,x0/6,po/c,x1/3,s14,x13/14,s12,x12/15,pi/n,x10/8,s11,pk/f,x7/1,s14,x6/2,s12,x12/13,s6,x6/8,s4,x10/14,pm/d,x11/9,s9,pp/f,x14/3,pe/c,x2/10,s15,x0/7,s11,x5/1,pa/j,x3/8,s2,x6/4,s5,pl/b,x2/15,s5,x3/11,ph/a,x9/12,s8,pd/m,x5/1,s13,x2/13,pb/j,x14/12,pm/a,x3/9,pe/o,s15,ph/p,s8,x2/4,s14,x13/8,pd/b,s5,x10/3,pn/p,x9/15,pl/m,x6/8,pi/k,x3/9,pm/c,x0/13,ph/i,x1/7,pn/k,s12,x9/10,pa/b,x15/8,s5,x2/13,s10,x6/0,s10,x8/2,s15,x12/7,s7,x13/6,s10,x0/4,s5,x2/5,pf/m,x1/7,s1,x8/6,s10,x2/1,pj/b,x13/14,pa/c,x7/3,pm/j,x2/14,s7,x3/8,s12,x14/12,pl/f,x10/6,s14,x14/7,s14,x12/4,s13,x7/13,s14,x0/15,s4,pc/d,x13/11,pn/l,x1/6,s8,x3/7,pc/d,s13,x1/11,s14,x0/9,pl/e,x8/7,pa/m,x6/11,s13,x13/1,s8,pl/g,x4/7,s5,x0/3,s5,x9/1,s4,pc/b,x4/11,pn/j,x7/14,s3,x15/5,s15,x13/12,s9,x9/4,s3,x8/5,s1,x7/4,pi/l,x14/9,pp/c,x8/6,pl/g,x4/12,s7,x5/15,s7,x2/7,pc/m,x12/14,s12,x1/13,s12,x7/8,s10,x3/4,pb/a,x7/8,s7,x2/6,s15,x10/3,s6,x7/15,s8,x10/3,s11,x6/11,s14,x8/9,pk/g,x7/12,pc/a,x11/15,pn/e,x2/10,s12,x5/14,s5,x9/10,s2,x13/3,ph/m,x1/6,pl/d,x13/15,s7,x12/6,pm/o,x11/13,s10,x2/6,pn/c,x8/10,s10,pp/f,x2/0,pb/j,x8/11,pe/p,s12,x10/6,po/f,x11/0,pd/p,s13,x15/9,s15,x1/2,s8,x6/5,po/n,x7/10,s2,x14/5,s10,x1/6,pp/e,x0/11,ph/j,x1/4,s2,x15/7,pb/p,x2/9,s12,x14/10,s5,x6/9,s11,x3/11,s2,x1/5,pd/g,x14/7,s8,x11/0,s12,x12/2,s10,x11/4,pp/b,x12/0,s1,x9/13,pi/a,x15/3,ph/b,x1/4,pd/e,x0/11,pa/n,x15/10,s7,x4/3,pd/e,x15/11,pf/m,x10/7,s10,x0/1,s8,x15/7,s8,x11/6,s6,x3/7,ph/c,x14/1,s9,pm/d,x5/8,pg/b,x2/7,pf/d,s2,x14/10,s2,x15/3,pj/e,x0/5,s7,x3/1,pp/f,x11/6,pd/h,s4,x0/4,pk/o,x6/10,s9,x15/3,s11,x12/5,pl/c,s10,x9/10,pn/f,x8/1,s1,x6/12,s6,x15/2,pp/d,x14/4,s11,x12/6,po/a,x2/10,s4,x8/15,pc/n,x5/11,s6,pi/d,x3/6,s2,x5/12,s3,x3/14,s4,x11/2,s4,x15/6,pl/p,s6,x5/9,s14,x11/0,s15,x4/9,pa/i,x10/15,pb/p,s3,x2/9,pd/f,x10/3,s14,x11/14,s13,x9/10,s5,x7/12,s9,x15/8,s15,x0/3,ph/m,s3,x4/2,pa/c,s13,x12/13,pj/m,x1/2,s8,x7/12,s2,x2/4,po/h,x12/5,pf/c,s10,x6/8,s8,x5/14,s4,x11/4,s11,x10/12,s5,x2/9,s11,x4/14,pj/i,x2/9,s2,x13/12,s11,x5/2,s8,x11/12,s4,x10/7,s14,x5/6,s5,x3/1,s12,x6/10,pg/b,x12/11,pj/f,x3/15,pm/i,x5/9,ph/b,s4,x15/2,po/e,x6/0,s2,x1/8,s14,x13/12,pc/j,x1/6,s3,pn/d,x13/14,s9,x4/11,s4,x7/1,s10,pe/o,x13/10,s11,x8/2,s3,x0/3,s1,x13/1,s11,x2/11,s1,x3/12,s1,x8/2,s8,pk/m,x0/10,pn/i,x8/7,pl/e,x11/14,s11,x3/8,s9,x15/12,pf/b,x4/0,pe/l,x12/8,pm/c,x5/2,pg/o,x14/3,s8,pl/f,s6,x10/0,s12,x2/5,s7,x10/8,ph/o,x3/15,pb/d,x6/12,s3,x2/10,pk/j,s1,pd/b,x6/1,pf/a,x12/10,s3,x0/6,s11,x11/9,s15,x8/12,pc/n,x15/13,s11,x12/11,s6,pp/l,x1/10,s12,pj/c,x6/0,s5,x13/12,s6,x10/14,s10,x5/1,po/n,x0/14,s9,x15/8,pi/e,x13/7,s3,x6/5,po/a,x2/7,s5,x12/14,pb/p,x13/0,pg/i,x9/6,s6,x12/13,s5,pa/j,x10/14,s8,x11/5,s15,x13/9,pf/l,x8/2,pj/c,s6,x5/0,s8,x12/1,pi/o,x14/3,s14,x1/5,s12,x15/4,s12,x7/6,s6,x12/15,s11,x10/13,s9,x3/6,s4,x15/9,s4,pc/b,x4/6,s6,x11/10,s7,x7/0,s9,x10/11,s9,x9/7,s12,x11/14,s13,x9/2,s12,x13/15,pk/p,x7/5,pc/d,x0/2,s9,x1/8,s12,x15/6,s3,x2/7,s3,x3/10,s5,x13/9,s14,x8/3,s12,x9/13,s5,x6/15,pb/n,x0/2,s10,x12/15,pm/e,x13/3,s7,x7/12,pl/k,x11/4,pm/f,x7/9,s2,x14/15,pp/e,x12/5,ph/f,x13/7,pl/k,x6/5,pc/f,s4,x9/15,s5,x14/10,s2,x4/8,pa/j,x7/0,s6,x6/2,s10,x11/14,s5,x0/10,s15,x2/6,pl/p,x0/4,s1,x8/15,s13,x14/3,pj/m,x9/11,pa/e,x14/6,s10,x9/8,pl/f,x14/10,s9,x2/9,s5,x15/10,pb/e,x13/5,s11,x7/6,s8,x5/14,s3,x12/9,s8,x5/0,ph/k,x1/3,s1,x10/13,s12,x3/15,s5,x11/9,pi/p,x7/8,s9,pn/l,x12/11,pe/p,x3/6,po/l,x9/8,s13,x11/14,pi/n,x0/15,pm/k,x10/8,s9,x12/2,s13,x10/4,s5,x3/6,pp/a,x10/11,s9,x0/3,s9,x9/13,s10,x6/14,pk/g,s15,x2/0,s8,x6/5,pp/j,x0/8,pd/o,x12/13,s7,x15/14,s6,x12/11,pc/i,x3/15,s6,x1/6,pe/l,x13/15,pc/f,x6/10,s6,x12/0,s1,x14/5,pk/g,s5,x8/0,s1,x12/4,s11,pj/p,x9/1,s11,x0/12,s14,pb/k,x6/10,s14,x1/2,po/l,x7/3,pn/h,x12/10,s8,x0/11,s11,x5/8,s7,pp/f,x11/7,s7,x6/14,s1,x9/1,s12,x12/0,pe/j,x9/2,s8,x5/14,pl/o,x15/4,pk/b,x0/3,s11,x8/1,pe/o,x3/5,pp/f,x13/10,s12,x1/15,s3,x7/6,po/k,x8/11,pp/b,x5/13,s9,x9/2,s12,x0/6,s5,x10/3,s10,x5/13,pj/k,x1/12,s8,x8/9,pb/d,s7,x13/10,s1,x9/7,s3,pa/g,x1/12,s10,x2/0,pk/h,x12/4,s11,pb/e,x5/6,s5,x9/13,pj/h,x1/4,s1,x6/9,pi/n,x14/15,s10,x8/3,s7,x0/10,s6,x11/12,s2,pf/h,x7/13,s9,x15/8,s11,x10/4,pb/p,x8/0,s6,x9/11,po/k,x4/10,ph/j,s4,x6/5,pc/n,x13/2,s1,x0/12,s12,x4/8,pa/l,x7/11,pd/h,x13/10,s5,x1/4,s3,x3/0,pg/e,x10/15,s13,x12/14,pd/i,x11/7,pe/h,x0/15,s12,x10/6,s9,x8/3,s12,pc/d,x14/1,pj/p,x8/0,s6,x5/2,s11,x13/4,pi/o,x1/8,s3,x3/15,pd/f,s12,pj/e,x1/5,pp/b,x8/9,s15,x0/5,pg/c,s2,x15/6,pn/k,s7,x11/5,s3,x0/8,pm/p,x15/10,s7,x8/4,s4,x9/15,s3,x0/11,s12,x9/8,s2,x0/15,pc/k,x12/2,s15,x15/8,s1,x10/4,s15,x6/12,pd/n,x4/7,pl/k,x11/5,s3,pc/m,s10,x6/15,s2,x5/10,s1,x7/1,s5,x4/5,pg/e,x10/8,s13,x3/4,s11,x15/7,pm/b,x10/13,pi/a,x5/9,pd/n,s3,x15/11,s7,x3/14,pc/p,x11/15,s14,x4/2,pj/o,x5/14,pb/g,x12/11,s7,x6/0,s10,pm/d,s7,x15/3,s9,x7/2,s6,x14/9,pp/k,x10/5,s4,x3/7,s5,x11/12,s4,x0/5,pg/f,x9/2,s2,x11/6,pb/i,x15/0,pm/h,x11/3,s1,x14/4,pg/d,x7/13,s15,x15/1,s13,x9/14,pa/j,x12/7,pe/o,x13/2,s12,x14/0,pd/a,x5/1,s7,x12/2,s7,pi/l,x10/4,pn/g,x14/3,s7,x2/9,pi/e,x1/11,pf/l,x15/12,s7,x8/2,pi/k,x10/14,s13,x0/2,ph/c,x9/15,pd/e,x4/8,s5,ph/m,x15/7,s8,x11/13,s4,x8/9,s13,x1/12,pj/d,x6/3,pl/k,x5/4,s2,x8/13,s3,x6/15,s4,x4/13,s15,x10/6,pf/a,x0/3,s6,po/e,x7/4,s7,x8/5,pb/d,x15/4,ph/o,x8/1,s9,x9/0,s11,x4/5,pl/f,x7/3,pm/d,x12/2,s12,x4/0,s6,x5/14,s5,x11/12,pe/k,x7/6,s4,x2/10,pj/d,x1/7,s4,x9/14,s1,pl/k,s8,pa/g,x3/2,s8,x5/6,s2,pf/k,x10/13,pn/m,x1/15,s6,x13/0,s5,x11/5,s15,x1/9,s1,x13/3,s15,x8/11,pd/a,x10/15,s8,x4/5,s1,x1/9,s5,pg/f,x12/11,s12,x14/7,ph/k,x15/4,pm/p,s2,x13/0,pl/o,x2/10,s3,x11/14,pi/j,s9,x4/7,pn/p,x12/6,s13,x7/4,s1,x9/8,s13,pk/e,x13/2,pf/l,s11,x9/0,pm/h,x1/3,pl/a,x11/4,s1,x0/9,pf/d,s5,x10/2,s5,pm/j,x11/14,s10,x10/3,pd/h,x9/13,s12,x5/14,s10,x6/7,pm/k,s3,x2/9,s8,x11/6,s15,x14/5,pa/l,x7/13,s9,x2/11,pj/p,x3/13,s10,pc/m,s2,ph/j,x10/4,pl/m,x11/1,s15,x14/13,s8,x7/12,s13,x0/13,s5,x5/9,s14,x0/8,s6,x11/13,pk/a,x0/4,s10,x11/7,pm/d,x2/5,pl/n,x11/7,pk/c,x14/8,s11,x2/0,s11,x13/6,s8,x11/12,s14,x10/1,pn/l,x12/5,ph/m,x6/10,pi/a,x13/8,pl/c,x2/3,pg/e,x10/8,s7,x3/5,s2,x0/8,po/k,x14/3,pl/f,x4/10,pe/i,x6/8,pp/l,x11/9,pc/f,s8,x4/7,s1,pn/l,x8/15,pa/p,x11/12,s3,po/i,s1,x14/7,pj/f,x5/3,s12,pi/d,s15,x4/7,s3,x14/15,s8,x6/3,s11,x13/10,s14,x9/3,s1,x5/7,s7,x10/3,pb/l,x9/13,pc/n,x14/0,pd/h,x10/2,s8,x7/0,s10,x14/1,s10,x6/9,s15,x1/14,s14,x12/5,s13,x13/3,s10,x10/14,s8,x9/12,pa/o,x0/11,pg/c,x1/8,pj/m,s12,pd/c,x5/11,s8,x3/0,po/l,x15/5,pp/d
diff --git a/2017/d16/ex2/ex2.py b/2017/d16/ex2/ex2.py
new file mode 100755
index 0000000..d65972d
--- /dev/null
+++ b/2017/d16/ex2/ex2.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Spin(NamedTuple):
+    n: int
+
+
+class Exchange(NamedTuple):
+    a: int
+    b: int
+
+
+class Partner(NamedTuple):
+    a: str
+    b: str
+
+
+Move = Spin | Exchange | Partner
+
+Programs = tuple[str, ...]
+
+
+def solve(input: str) -> str:
+    def parse_move(input: str) -> Move:
+        if input[0] == "s":
+            return Spin(int(input[1:]))
+        if input[0] == "x":
+            return Exchange(*map(int, input[1:].split("/")))
+        if input[0] == "p":
+            return Partner(*input[1:].split("/"))
+        assert False  # Sanity check
+
+    def parse(input: str) -> list[Move]:
+        return [parse_move(move) for move in input.strip().split(",")]
+
+    def apply_move(programs: Programs, move: Move) -> Programs:
+        match move:
+            case Spin(n):
+                return programs[-n:] + programs[:-n]
+            case Exchange(a, b):
+                tmp = list(programs)
+                tmp[a], tmp[b] = tmp[b], tmp[a]
+                return tuple(tmp)
+            case Partner(a, b):
+                ia, ib = programs.index(a), programs.index(b)
+                tmp = list(programs)
+                tmp[ia], tmp[ib] = tmp[ib], tmp[ia]
+                return tuple(tmp)
+
+    def do_dance(programs: Programs, moves: list[Move]) -> Programs:
+        t = 0
+        cache = {(programs, 0): 0}
+        TOTAL_MOVES = 1000000000 * len(moves)
+        while t < TOTAL_MOVES:
+            programs = apply_move(programs, moves[t % len(moves)])
+            t += 1
+            key = (programs, t % len(moves))
+            if (previous_t := cache.get(key)) is not None:
+                cycle_length = t - previous_t
+                num_cycles = (TOTAL_MOVES - t) // cycle_length
+                t += num_cycles * cycle_length
+            else:
+                cache[key] = t
+
+        return programs
+
+    moves = parse(input)
+    programs = tuple(chr(ord("a") + i) for i in range(16))
+    programs = do_dance(programs, moves)
+    return "".join(programs)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d16/ex2/input b/2017/d16/ex2/input
new file mode 100644
index 0000000..205f5dc
--- /dev/null
+++ b/2017/d16/ex2/input
@@ -0,0 +1 @@
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pk/p,x3/4,s2,x6/7,pf/b,x0/3,pl/j,x11/1,pg/b,s7,x15/10,s6,x1/12,s8,x9/3,pj/a,x13/11,s2,x9/3,s6,x5/7,pd/e,x6/8,s15,x3/0,s12,x4/2,pg/j,s7,pe/b,x12/0,pj/h,s5,x2/9,s12,x15/6,pm/b,x11/4,s10,x2/8,s8,x9/3,s7,x11/5,pk/c,x6/3,s12,x10/0,s14,x15/5,pi/b,s11,x3/4,s2,x13/14,s11,x6/12,s15,x2/5,pp/d,x4/7,s15,x14/8,s1,x3/12,s11,x0/14,s13,x12/5,pj/i,x2/15,pa/f,x9/8,s1,x14/10,s4,x1/2,pc/l,x14/9,s8,x7/10,s5,x1/3,pk/g,x9/14,s12,x11/7,s5,x10/8,s15,x15/9,ph/l,x2/1,s14,x11/4,s10,x6/5,s14,x7/14,s3,pf/b,x4/15,pd/k,x13/1,s6,x6/9,s4,x12/15,s6,x1/13,s4,x11/2,pf/h,x4/12,s4,x9/10,s2,pn/l,x1/8,s10,x9/15,s8,x2/6,pi/g,x4/13,s7,x15/0,pn/j,x7/13,s2,x0/11,s6,x9/4,po/i,x13/10,s5,x3/0,s10,x8/7,s8,x0/12,s13,x4/3,s1,x2/5,s3,x8/15,s8,x0/10,pe/k,s7,x8/15,s6,pd/p,x3/6,s5,x15/1,ph/o,x10/0,pc/l,x15/14,s8,x6/12,s6,x15/5,pi/e,x1/11,s6,x3/5,s5,x2/11,s3,pl/k,x15/1,s14,x3/12,s1,x5/0,pn/h,x8/7,pd/p,s12,x5/15,pm/j,x4/6,s11,x10/9,pk/a,s4,x13/0,s12,x6/5,s5,x14/8,s11,x15/7,s2,x14/4,s11,pd/h,x11/15,s3,x2/1,pc/o,x0/8,s15,x15/3,pl/m,x7/6,pi/j,x4/14,s2,pg/d,s13,x13/3,s11,x5/10,pc/b,x2/8,s13,x14/1,pj/d,x11/8,po/i,x3/13,s1,x1/11,s10,x7/0,pg/p,x3/13,pa/c,x4/6,s7,x0/9,ph/p,x14/15,s7,x0/5,s5,x13/7,s3,x5/0,pd/l,s4,x1/13,s10,pn/b,x6/15,s1,x3/11,s8,x8/9,pc/e,s5,x12/11,s4,x14/13,pj/d,x9/0,s5,x13/11,pm/c,x3/0,s9,x2/1,pb/k,x14/7,s4,x8/4,s2,pj/l,x9/13,s12,x0/12,po/e,x6/5,pb/n,x12/11,s2,x4/3,s7,x6/12,pm/g,x3/15,s4,x2/9,pj/h,x13/7,s14,x4/10,s2,x11/12,pe/n,x14/10,s2,pl/c,s1,x2/8,s9,x0/9,s7,x13/6,s13,x7/11,ph/k,x15/1,pn/a,x12/3,s13,x10/11,s10,x8/15,pd/o,x3/11,pf/g,x7/12,pn/b,x14/13,po/f,x10/8,s5,x11/15,s2,x6/10,s15,x14/0,s4,x5/15,pm/k,x0/11,pl/j,x10/4,pn/f,s3,pj/m,x14/2,s5,x10/13,s9,x15/14,s13,x2/8,s4,x1/15,pl/k,x9/6,s5,x14/7,s1,x13/1,pi/a,x10/11,s4,pb/g,x1/0,pm/j,x6/12,s12,x2/3,s12,x0/12,s11,x10/5,pd/f,x15/4,s7,x2/0,s4,x6/5,s8,x10/8,s5,x3/12,pj/h,x2/11,s14,x6/1,s6,x8/12,po/a,s6,x2/5,s14,x13/7,pi/j,x15/6,pa/o,x0/1,pb/n,x9/2,pd/j,x12/13,s5,x4/14,s12,ph/f,x1/12,pm/d,x11/10,pn/i,x12/9,s8,x13/15,po/b,x11/12,s11,pj/p,x9/4,s3,x14/1,pk/c,x7/6,s8,x11/0,s1,po/i,x1/15,s6,pc/l,x11/9,s7,x15/2,s14,pi/p,s10,x9/4,s10,x7/12,pn/c,x11/4,s14,x9/3,pm/j,x8/6,pd/l,x3/9,ph/a,x2/15,s3,x5/9,s15,x4/1,pn/f,x10/11,ph/i,x5/0,pa/l,x15/9,s1,x2/8,s3,x1/14,s13,x10/4,s11,x3/0,pb/k,s5,x12/11,po/a,x3/4,s9,x8/14,s5,x9/12,s6,x3/5,s14,pl/k,s4,x6/9,pf/m,x10/14,s2,x2/9,pb/d,x11/4,pf/e,x5/1,s12,x9/12,s3,x0/6,po/c,x1/3,s14,x13/14,s12,x12/15,pi/n,x10/8,s11,pk/f,x7/1,s14,x6/2,s12,x12/13,s6,x6/8,s4,x10/14,pm/d,x11/9,s9,pp/f,x14/3,pe/c,x2/10,s15,x0/7,s11,x5/1,pa/j,x3/8,s2,x6/4,s5,pl/b,x2/15,s5,x3/11,ph/a,x9/12,s8,pd/m,x5/1,s13,x2/13,pb/j,x14/12,pm/a,x3/9,pe/o,s15,ph/p,s8,x2/4,s14,x13/8,pd/b,s5,x10/3,pn/p,x9/15,pl/m,x6/8,pi/k,x3/9,pm/c,x0/13,ph/i,x1/7,pn/k,s12,x9/10,pa/b,x15/8,s5,x2/13,s10,x6/0,s10,x8/2,s15,x12/7,s7,x13/6,s10,x0/4,s5,x2/5,pf/m,x1/7,s1,x8/6,s10,x2/1,pj/b,x13/14,pa/c,x7/3,pm/j,x2/14,s7,x3/8,s12,x14/12,pl/f,x10/6,s14,x14/7,s14,x12/4,s13,x7/13,s14,x0/15,s4,pc/d,x13/11,pn/l,x1/6,s8,x3/7,pc/d,s13,x1/11,s14,x0/9,pl/e,x8/7,pa/m,x6/11,s13,x13/1,s8,pl/g,x4/7,s5,x0/3,s5,x9/1,s4,pc/b,x4/11,pn/j,x7/14,s3,x15/5,s15,x13/12,s9,x9/4,s3,x8/5,s1,x7/4,pi/l,x14/9,pp/c,x8/6,pl/g,x4/12,s7,x5/15,s7,x2/7,pc/m,x12/14,s12,x1/13,s12,x7/8,s10,x3/4,pb/a,x7/8,s7,x2/6,s15,x10/3,s6,x7/15,s8,x10/3,s11,x6/11,s14,x8/9,pk/g,x7/12,pc/a,x11/15,pn/e,x2/10,s12,x5/14,s5,x9/10,s2,x13/3,ph/m,x1/6,pl/d,x13/15,s7,x12/6,pm/o,x11/13,s10,x2/6,pn/c,x8/10,s10,pp/f,x2/0,pb/j,x8/11,pe/p,s12,x10/6,po/f,x11/0,pd/p,s13,x15/9,s15,x1/2,s8,x6/5,po/n,x7/10,s2,x14/5,s10,x1/6,pp/e,x0/11,ph/j,x1/4,s2,x15/7,pb/p,x2/9,s12,x14/10,s5,x6/9,s11,x3/11,s2,x1/5,pd/g,x14/7,s8,x11/0,s12,x12/2,s10,x11/4,pp/b,x12/0,s1,x9/13,pi/a,x15/3,ph/b,x1/4,pd/e,x0/11,pa/n,x15/10,s7,x4/3,pd/e,x15/11,pf/m,x10/7,s10,x0/1,s8,x15/7,s8,x11/6,s6,x3/7,ph/c,x14/1,s9,pm/d,x5/8,pg/b,x2/7,pf/d,s2,x14/10,s2,x15/3,pj/e,x0/5,s7,x3/1,pp/f,x11/6,pd/h,s4,x0/4,pk/o,x6/10,s9,x15/3,s11,x12/5,pl/c,s10,x9/10,pn/f,x8/1,s1,x6/12,s6,x15/2,pp/d,x14/4,s11,x12/6,po/a,x2/10,s4,x8/15,pc/n,x5/11,s6,pi/d,x3/6,s2,x5/12,s3,x3/14,s4,x11/2,s4,x15/6,pl/p,s6,x5/9,s14,x11/0,s15,x4/9,pa/i,x10/15,pb/p,s3,x2/9,pd/f,x10/3,s14,x11/14,s13,x9/10,s5,x7/12,s9,x15/8,s15,x0/3,ph/m,s3,x4/2,pa/c,s13,x12/13,pj/m,x1/2,s8,x7/12,s2,x2/4,po/h,x12/5,pf/c,s10,x6/8,s8,x5/14,s4,x11/4,s11,x10/12,s5,x2/9,s11,x4/14,pj/i,x2/9,s2,x13/12,s11,x5/2,s8,x11/12,s4,x10/7,s14,x5/6,s5,x3/1,s12,x6/10,pg/b,x12/11,pj/f,x3/15,pm/i,x5/9,ph/b,s4,x15/2,po/e,x6/0,s2,x1/8,s14,x13/12,pc/j,x1/6,s3,pn/d,x13/14,s9,x4/11,s4,x7/1,s10,pe/o,x13/10,s11,x8/2,s3,x0/3,s1,x13/1,s11,x2/11,s1,x3/12,s1,x8/2,s8,pk/m,x0/10,pn/i,x8/7,pl/e,x11/14,s11,x3/8,s9,x15/12,pf/b,x4/0,pe/l,x12/8,pm/c,x5/2,pg/o,x14/3,s8,pl/f,s6,x10/0,s12,x2/5,s7,x10/8,ph/o,x3/15,pb/d,x6/12,s3,x2/10,pk/j,s1,pd/b,x6/1,pf/a,x12/10,s3,x0/6,s11,x11/9,s15,x8/12,pc/n,x15/13,s11,x12/11,s6,pp/l,x1/10,s12,pj/c,x6/0,s5,x13/12,s6,x10/14,s10,x5/1,po/n,x0/14,s9,x15/8,pi/e,x13/7,s3,x6/5,po/a,x2/7,s5,x12/14,pb/p,x13/0,pg/i,x9/6,s6,x12/13,s5,pa/j,x10/14,s8,x11/5,s15,x13/9,pf/l,x8/2,pj/c,s6,x5/0,s8,x12/1,pi/o,x14/3,s14,x1/5,s12,x15/4,s12,x7/6,s6,x12/15,s11,x10/13,s9,x3/6,s4,x15/9,s4,pc/b,x4/6,s6,x11/10,s7,x7/0,s9,x10/11,s9,x9/7,s12,x11/14,s13,x9/2,s12,x13/15,pk/p,x7/5,pc/d,x0/2,s9,x1/8,s12,x15/6,s3,x2/7,s3,x3/10,s5,x13/9,s14,x8/3,s12,x9/13,s5,x6/15,pb/n,x0/2,s10,x12/15,pm/e,x13/3,s7,x7/12,pl/k,x11/4,pm/f,x7/9,s2,x14/15,pp/e,x12/5,ph/f,x13/7,pl/k,x6/5,pc/f,s4,x9/15,s5,x14/10,s2,x4/8,pa/j,x7/0,s6,x6/2,s10,x11/14,s5,x0/10,s15,x2/6,pl/p,x0/4,s1,x8/15,s13,x14/3,pj/m,x9/11,pa/e,x14/6,s10,x9/8,pl/f,x14/10,s9,x2/9,s5,x15/10,pb/e,x13/5,s11,x7/6,s8,x5/14,s3,x12/9,s8,x5/0,ph/k,x1/3,s1,x10/13,s12,x3/15,s5,x11/9,pi/p,x7/8,s9,pn/l,x12/11,pe/p,x3/6,po/l,x9/8,s13,x11/14,pi/n,x0/15,pm/k,x10/8,s9,x12/2,s13,x10/4,s5,x3/6,pp/a,x10/11,s9,x0/3,s9,x9/13,s10,x6/14,pk/g,s15,x2/0,s8,x6/5,pp/j,x0/8,pd/o,x12/13,s7,x15/14,s6,x12/11,pc/i,x3/15,s6,x1/6,pe/l,x13/15,pc/f,x6/10,s6,x12/0,s1,x14/5,pk/g,s5,x8/0,s1,x12/4,s11,pj/p,x9/1,s11,x0/12,s14,pb/k,x6/10,s14,x1/2,po/l,x7/3,pn/h,x12/10,s8,x0/11,s11,x5/8,s7,pp/f,x11/7,s7,x6/14,s1,x9/1,s12,x12/0,pe/j,x9/2,s8,x5/14,pl/o,x15/4,pk/b,x0/3,s11,x8/1,pe/o,x3/5,pp/f,x13/10,s12,x1/15,s3,x7/6,po/k,x8/11,pp/b,x5/13,s9,x9/2,s12,x0/6,s5,x10/3,s10,x5/13,pj/k,x1/12,s8,x8/9,pb/d,s7,x13/10,s1,x9/7,s3,pa/g,x1/12,s10,x2/0,pk/h,x12/4,s11,pb/e,x5/6,s5,x9/13,pj/h,x1/4,s1,x6/9,pi/n,x14/15,s10,x8/3,s7,x0/10,s6,x11/12,s2,pf/h,x7/13,s9,x15/8,s11,x10/4,pb/p,x8/0,s6,x9/11,po/k,x4/10,ph/j,s4,x6/5,pc/n,x13/2,s1,x0/12,s12,x4/8,pa/l,x7/11,pd/h,x13/10,s5,x1/4,s3,x3/0,pg/e,x10/15,s13,x12/14,pd/i,x11/7,pe/h,x0/15,s12,x10/6,s9,x8/3,s12,pc/d,x14/1,pj/p,x8/0,s6,x5/2,s11,x13/4,pi/o,x1/8,s3,x3/15,pd/f,s12,pj/e,x1/5,pp/b,x8/9,s15,x0/5,pg/c,s2,x15/6,pn/k,s7,x11/5,s3,x0/8,pm/p,x15/10,s7,x8/4,s4,x9/15,s3,x0/11,s12,x9/8,s2,x0/15,pc/k,x12/2,s15,x15/8,s1,x10/4,s15,x6/12,pd/n,x4/7,pl/k,x11/5,s3,pc/m,s10,x6/15,s2,x5/10,s1,x7/1,s5,x4/5,pg/e,x10/8,s13,x3/4,s11,x15/7,pm/b,x10/13,pi/a,x5/9,pd/n,s3,x15/11,s7,x3/14,pc/p,x11/15,s14,x4/2,pj/o,x5/14,pb/g,x12/11,s7,x6/0,s10,pm/d,s7,x15/3,s9,x7/2,s6,x14/9,pp/k,x10/5,s4,x3/7,s5,x11/12,s4,x0/5,pg/f,x9/2,s2,x11/6,pb/i,x15/0,pm/h,x11/3,s1,x14/4,pg/d,x7/13,s15,x15/1,s13,x9/14,pa/j,x12/7,pe/o,x13/2,s12,x14/0,pd/a,x5/1,s7,x12/2,s7,pi/l,x10/4,pn/g,x14/3,s7,x2/9,pi/e,x1/11,pf/l,x15/12,s7,x8/2,pi/k,x10/14,s13,x0/2,ph/c,x9/15,pd/e,x4/8,s5,ph/m,x15/7,s8,x11/13,s4,x8/9,s13,x1/12,pj/d,x6/3,pl/k,x5/4,s2,x8/13,s3,x6/15,s4,x4/13,s15,x10/6,pf/a,x0/3,s6,po/e,x7/4,s7,x8/5,pb/d,x15/4,ph/o,x8/1,s9,x9/0,s11,x4/5,pl/f,x7/3,pm/d,x12/2,s12,x4/0,s6,x5/14,s5,x11/12,pe/k,x7/6,s4,x2/10,pj/d,x1/7,s4,x9/14,s1,pl/k,s8,pa/g,x3/2,s8,x5/6,s2,pf/k,x10/13,pn/m,x1/15,s6,x13/0,s5,x11/5,s15,x1/9,s1,x13/3,s15,x8/11,pd/a,x10/15,s8,x4/5,s1,x1/9,s5,pg/f,x12/11,s12,x14/7,ph/k,x15/4,pm/p,s2,x13/0,pl/o,x2/10,s3,x11/14,pi/j,s9,x4/7,pn/p,x12/6,s13,x7/4,s1,x9/8,s13,pk/e,x13/2,pf/l,s11,x9/0,pm/h,x1/3,pl/a,x11/4,s1,x0/9,pf/d,s5,x10/2,s5,pm/j,x11/14,s10,x10/3,pd/h,x9/13,s12,x5/14,s10,x6/7,pm/k,s3,x2/9,s8,x11/6,s15,x14/5,pa/l,x7/13,s9,x2/11,pj/p,x3/13,s10,pc/m,s2,ph/j,x10/4,pl/m,x11/1,s15,x14/13,s8,x7/12,s13,x0/13,s5,x5/9,s14,x0/8,s6,x11/13,pk/a,x0/4,s10,x11/7,pm/d,x2/5,pl/n,x11/7,pk/c,x14/8,s11,x2/0,s11,x13/6,s8,x11/12,s14,x10/1,pn/l,x12/5,ph/m,x6/10,pi/a,x13/8,pl/c,x2/3,pg/e,x10/8,s7,x3/5,s2,x0/8,po/k,x14/3,pl/f,x4/10,pe/i,x6/8,pp/l,x11/9,pc/f,s8,x4/7,s1,pn/l,x8/15,pa/p,x11/12,s3,po/i,s1,x14/7,pj/f,x5/3,s12,pi/d,s15,x4/7,s3,x14/15,s8,x6/3,s11,x13/10,s14,x9/3,s1,x5/7,s7,x10/3,pb/l,x9/13,pc/n,x14/0,pd/h,x10/2,s8,x7/0,s10,x14/1,s10,x6/9,s15,x1/14,s14,x12/5,s13,x13/3,s10,x10/14,s8,x9/12,pa/o,x0/11,pg/c,x1/8,pj/m,s12,pd/c,x5/11,s8,x3/0,po/l,x15/5,pp/d
diff --git a/2017/d17/ex1/ex1.py b/2017/d17/ex1/ex1.py
new file mode 100755
index 0000000..ad650a7
--- /dev/null
+++ b/2017/d17/ex1/ex1.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> int:
+        return int(input.strip())
+
+    lock = collections.deque([0])
+    step = parse(input)
+    for i in range(1, 2017 + 1):
+        lock.rotate(-step)
+        lock.append(i)
+    return lock[0]
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d17/ex1/input b/2017/d17/ex1/input
new file mode 100644
index 0000000..66a899a
--- /dev/null
+++ b/2017/d17/ex1/input
@@ -0,0 +1 @@
+377
diff --git a/2017/d17/ex2/ex2.py b/2017/d17/ex2/ex2.py
new file mode 100755
index 0000000..5fab2dc
--- /dev/null
+++ b/2017/d17/ex2/ex2.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> int:
+        return int(input.strip())
+
+    lock = collections.deque([0])
+    step = parse(input)
+    for i in range(1, 50000000 + 1):
+        lock.rotate(-step)
+        lock.append(i)
+    return lock[lock.index(0) + 1]
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d17/ex2/input b/2017/d17/ex2/input
new file mode 100644
index 0000000..66a899a
--- /dev/null
+++ b/2017/d17/ex2/input
@@ -0,0 +1 @@
+377
diff --git a/2017/d18/ex1/ex1.py b/2017/d18/ex1/ex1.py
new file mode 100755
index 0000000..daa8cdf
--- /dev/null
+++ b/2017/d18/ex1/ex1.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+
+import collections
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Op(enum.StrEnum):
+    SND = "snd"
+    SET = "set"
+    ADD = "add"
+    MUL = "mul"
+    MOD = "mod"
+    RCV = "rcv"
+    JGZ = "jgz"
+
+
+class Instruction(NamedTuple):
+    op: Op
+    x: str
+    y: str | None = None
+
+    @classmethod
+    def from_str(cls, input: str) -> "Instruction":
+        op, *rest = input.split()
+        return cls(Op(op), *rest)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Instruction]:
+        return [Instruction.from_str(line) for line in input.splitlines()]
+
+    def resolve(y: str | None, registers: dict[str, int]) -> int:
+        assert y is not None  # Sanity check
+        try:
+            return int(y)
+        except ValueError:
+            return registers[y]
+
+    instructions = parse(input)
+    registers: dict[str, int] = collections.defaultdict(int)
+
+    ip = 0
+    freq: int | None = None
+    while True:
+        assert 0 <= ip < len(instructions)  # Sanity check
+        instr = instructions[ip]
+        ip += 1
+        match instr.op:
+            case Op.SND:
+                freq = resolve(instr.x, registers)
+            case Op.SET:
+                registers[instr.x] = resolve(instr.y, registers)
+            case Op.ADD:
+                registers[instr.x] += resolve(instr.y, registers)
+            case Op.MUL:
+                registers[instr.x] *= resolve(instr.y, registers)
+            case Op.MOD:
+                registers[instr.x] %= resolve(instr.y, registers)
+            case Op.RCV:
+                if resolve(instr.x, registers) != 0:
+                    assert freq is not None
+                    return freq
+            case Op.JGZ:
+                if resolve(instr.x, registers) > 0:
+                    ip += resolve(instr.y, registers) - 1  # Account auto-increment
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d18/ex1/input b/2017/d18/ex1/input
new file mode 100644
index 0000000..ea1762c
--- /dev/null
+++ b/2017/d18/ex1/input
@@ -0,0 +1,41 @@
+set i 31
+set a 1
+mul p 17
+jgz p p
+mul a 2
+add i -1
+jgz i -2
+add a -1
+set i 127
+set p 826
+mul p 8505
+mod p a
+mul p 129749
+add p 12345
+mod p a
+set b p
+mod b 10000
+snd b
+add i -1
+jgz i -9
+jgz a 3
+rcv b
+jgz b -1
+set f 0
+set i 126
+rcv a
+rcv b
+set p a
+mul p -1
+add p b
+jgz p 4
+snd a
+set a b
+jgz 1 3
+snd b
+set f 1
+add i -1
+jgz i -11
+snd a
+jgz f -16
+jgz a -19
diff --git a/2017/d18/ex2/ex2.py b/2017/d18/ex2/ex2.py
new file mode 100755
index 0000000..c9ca81b
--- /dev/null
+++ b/2017/d18/ex2/ex2.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python
+
+import collections
+import dataclasses
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Op(enum.StrEnum):
+    SND = "snd"
+    SET = "set"
+    ADD = "add"
+    MUL = "mul"
+    MOD = "mod"
+    RCV = "rcv"
+    JGZ = "jgz"
+
+
+class Instruction(NamedTuple):
+    op: Op
+    x: str
+    y: str | None = None
+
+    @classmethod
+    def from_str(cls, input: str) -> "Instruction":
+        op, *rest = input.split()
+        return cls(Op(op), *rest)
+
+
+@dataclasses.dataclass
+class Program:
+    instructions: list[Instruction]
+    id: dataclasses.InitVar[int]
+    registers: dict[str, int] = dataclasses.field(init=False)
+    ip: int = dataclasses.field(init=False, default=0)
+
+    receive_queue: collections.deque[int] = dataclasses.field(
+        init=False, default_factory=collections.deque
+    )
+    send_queue: collections.deque[int] = dataclasses.field(
+        init=False, default_factory=collections.deque
+    )
+    values_sent: int = dataclasses.field(init=False, default=0)
+
+    def __post_init__(self, id: int) -> None:
+        self.registers = collections.defaultdict(int)
+        self.registers["p"] = id
+
+    def _resolve(self, y: str | None) -> int:
+        assert y is not None  # Sanity check
+        try:
+            return int(y)
+        except ValueError:
+            return self.registers[y]
+
+    def execute(self) -> None:
+        while True:
+            assert 0 <= self.ip < len(self.instructions)  # Sanity check
+            instr = self.instructions[self.ip]
+            match instr.op:
+                case Op.SND:
+                    self.send_queue.append(self._resolve(instr.x))
+                    self.values_sent += 1
+                case Op.SET:
+                    self.registers[instr.x] = self._resolve(instr.y)
+                case Op.ADD:
+                    self.registers[instr.x] += self._resolve(instr.y)
+                case Op.MUL:
+                    self.registers[instr.x] *= self._resolve(instr.y)
+                case Op.MOD:
+                    self.registers[instr.x] %= self._resolve(instr.y)
+                case Op.RCV:
+                    if not self.receive_queue:
+                        return  # Block and wait for a value to be sent
+                    self.registers[instr.x] = self.receive_queue.popleft()
+                case Op.JGZ:
+                    if self._resolve(instr.x) > 0:
+                        self.ip += self._resolve(instr.y) - 1  # Account auto-increment
+            self.ip += 1
+
+    @property
+    def is_terminated(self) -> bool:
+        # Has the program jumped outside the instructions
+        return self.ip < 0 or self.ip >= len(self.instructions)
+
+    @property
+    def is_blocked(self) -> bool:
+        if self.is_terminated:
+            return True
+        # Is it blocked on a `RCV`
+        return self.instructions[self.ip].op == Op.RCV and not self.receive_queue
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Instruction]:
+        return [Instruction.from_str(line) for line in input.splitlines()]
+
+    instructions = parse(input)
+    p0, p1 = Program(instructions, id=0), Program(instructions, id=1)
+
+    while True:
+        if p0.is_blocked and p1.is_blocked:
+            return p1.values_sent
+
+        p0.execute()
+        p1.execute()
+
+        p0.receive_queue.extend(p1.send_queue)
+        p1.send_queue.clear()
+        p1.receive_queue.extend(p0.send_queue)
+        p0.send_queue.clear()
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d18/ex2/input b/2017/d18/ex2/input
new file mode 100644
index 0000000..ea1762c
--- /dev/null
+++ b/2017/d18/ex2/input
@@ -0,0 +1,41 @@
+set i 31
+set a 1
+mul p 17
+jgz p p
+mul a 2
+add i -1
+jgz i -2
+add a -1
+set i 127
+set p 826
+mul p 8505
+mod p a
+mul p 129749
+add p 12345
+mod p a
+set b p
+mod b 10000
+snd b
+add i -1
+jgz i -9
+jgz a 3
+rcv b
+jgz b -1
+set f 0
+set i 126
+rcv a
+rcv b
+set p a
+mul p -1
+add p b
+jgz p 4
+snd a
+set a b
+jgz 1 3
+snd b
+set f 1
+add i -1
+jgz i -11
+snd a
+jgz f -16
+jgz a -19
diff --git a/2017/d19/ex1/ex1.py b/2017/d19/ex1/ex1.py
new file mode 100755
index 0000000..6cc724c
--- /dev/null
+++ b/2017/d19/ex1/ex1.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+import enum
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.Enum):
+    UP = Point(-1, 0)
+    DOWN = Point(1, 0)
+    LEFT = Point(0, -1)
+    RIGHT = Point(0, 1)
+
+    def apply(self, p: Point) -> Point:
+        dx, dy = self.value
+        return Point(p.x + dx, p.y + dy)
+
+    def turns(self) -> Iterator["Direction"]:
+        match self:
+            case Direction.UP | Direction.DOWN:
+                turns = (Direction.LEFT, Direction.RIGHT)
+            case Direction.LEFT | Direction.RIGHT:
+                turns = (Direction.UP, Direction.DOWN)
+        yield from turns
+
+
+def solve(input: str) -> str:
+    def parse(input: str) -> dict[Point, str]:
+        return {
+            Point(x, y): c
+            for x, line in enumerate(input.splitlines())
+            for y, c in enumerate(line)
+            if c != " "
+        }
+
+    def packet_spell(map: dict[Point, str]) -> str:
+        letters: list[str] = []
+        # Travel starts downward, from outside the map before the first line
+        pos = min(map.keys(), key=lambda p: p.x)
+        dir = Direction.DOWN
+
+        while True:
+            if (letter := map[pos]) not in ("+", "|", "-"):
+                letters.append(letter)
+            new_dir = dir
+            new_pos = dir.apply(pos)
+            if new_pos not in map:
+                for new_dir in dir.turns():
+                    if (new_pos := new_dir.apply(pos)) in map:
+                        break
+                else:
+                    # Must be the end of the line, stop looping
+                    return "".join(letters)
+            dir = new_dir
+            pos = new_pos
+
+    map = parse(input)
+    return packet_spell(map)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d19/ex1/input b/2017/d19/ex1/input
new file mode 100644
index 0000000..2a3c8fc
--- /dev/null
+++ b/2017/d19/ex1/input
@@ -0,0 +1,201 @@
+                                                                                                             |                                                                                           
+     +---+     +-------------------------------+         +---+     +---------+   +---------------------------|-------------------------------------------------------------------------+ +-----+         
+     |   |     |                               |         |   |     |         |   |                           |                                                                         | |     |         
+     |   +-----|---------+         +---------------------|---|-----|-------------|---------------------------|-------------------------------------------------------------------------+ |     +-------+ 
+     |         |         |         |           |         |   |     |         |   |                           |                                                                           |             | 
+     |     +---+     +---------+   |           |         |   | +-------------------------------------------------------------------------------------------------------+   A-+ +-----------------------+ 
+     |     |         |   |     |   |           |         |   | |   |         |   |                           |                                                         |     | |         |               
+     |     |         |   |     |   |   +---------------------|-----|---------|-----------+                   |                     +-----------------------------------------------+     |               
+     |     |         |   |     |   |   |       |         |   | |   |         |   |       |                   |                     |                                   |     | |   |     |               
+     |     |         |   |     |   |   |       |         |   | |   +---------|-----------|-------------------|---------------------|-----------------------------------------|-----------|-------------+ 
+     |     R         |   |     |   |   |       |         |   | |             |   |       |                   |                     |                                   |     | |   |     |             | 
+     |     |         |   | +-------|---------------------------|-------------|-----------|-------------------|---------------------|-------------+         +-----------|-----|-----|-----+     +-------+ 
+     |     |         |   | |   |   |   |       |         |   | |             |   |       |                   |                     |             |         |           |     | |   |           |         
+     |     +---------|-------+ |   |   |       |         |   +-|---------+ +-|---|-----+ | +-----------------|---------------------|-------+     |         |         +-|-----|-|---|-----------------+   
+     |               |   | | | |   |   |       |         |     |         | | |   |     | | |                 |                     |       |     |         |         | |     | |   |           |     |   
+ +-------------------|-----|-|-|-------|-------|---------|-----+         | | |   |     | | +-----------------|---------------------------------------------|---------|---------|---|-----------+     |   
+ |   |               |   | | | |   |   |       |         |               | | |   |     | |                   |                     |       |     |         |         | |     | |   |                 |   
+ | +-----+           +---|---|-----|---|-----------------|-----------------|-----------|-|-------------------------------------+   |       |     |         +---------|-|---+ +-|---------------------+   
+ | | |   |               | | | |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |   |   |   |                     
+ | +-+   |               | | | |   |   |       |         |               | | |   |     +---------------------|-----------------------------|-----|-------------------|-|---+   |   |                     
+ |       |               | | | |   |   |       |         |               | | |   |       |                   |                 |   |       |     |                   | |       |   |                     
+ |     +---------------------+ |   |   |       |         |               | | |   |     +-|-----------------------------------------|-------|-------------------------|-|-------|-------+             +-+ 
+ |     | |               | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   |   |             | | 
+ |     | | +---------+   | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   | +---------------+ | 
+ |     | | |         |   | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   | | |               | 
+ +---+ | | | +-+     |   | |   |   +-----+     |       +-|---------------+ | | +-|-------|-------------------|-+               |   |       |     |                   | |       |   | | |               | 
+     | | | | | |     |   | |   |       | |     |       | |                 | | | |     | |                   | |               |   |       |     |                   | |       |   | W |               | 
+ +-------|-|-|-|-+   |   | |   |       | +-------------|-------------------|-|-|-------|-|-------------------------------------|-----------|-----------------+       +-|-----------|-----------------+ | 
+ |   | | | | | | |   |   | |   |       |       |       | |                 | | | |     | |                   | H               |   |       |     |           |         |       |   | | |             | | 
+ |   | +-|-------+   |   | |   |       |       |       | |                 | | | |     | |         +---------|---------------------|-------|-----|---------------------------------|-|---------------+ | 
+ |   |   | | | |     |   | |   |       |       |       | |                 | | | |     | |         |         | |               |   |       |     |           |         |       |   | | |               | 
+ |   +-----|-|---+   |   | |   +---+   |       |       +-|-----------------------|-----|-------+   |         | |               |   |       |     |           |         |       |   +-|-|-------------+ | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         | |               |   |       |     |           |         |       |     | |             | | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         | +-------------------|-------|-----|---------+ |         | +---------------+           | | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         |                 |   |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |       |   | +-+   |         |                 | | | |     | |     +-------------|-----------------|-+ |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |       |   | | |   |         |                 | | | |     | |         |         |                 | | |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |     +-----------------------------------------|-----|-------|---------|---------|-----------+     | | |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |     | |   | | |   |         |                 | | | |     | |         |         |           |     | | |       |     |         | |         | |     |     | | |           | | 
+ |     +-|-|-|-+ |   |   | |   +-|-|-------|-------------------------------|-|---|-----|-|---------|---------|-----------|-------|-+       |     |         | |         | | +-+ |     | | |         +-+ | 
+ |     | | | |   |   |   | |   | | |   | | |   |         |                 | | | |     | |         |         |           |     | |         |     |         | |         | | | | |     | | |         |   | 
+ |   +-|---------|-+ | +---------|-|---|-+ |   | +-------+         +-------|-|---------|---------------------|-----------|-----------------------------------|---+     | | | | |     | | |         |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           |     | |         |     |         | |   |     | | | | |     | | |         |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           | +-------------------------------------------|-----|-|-------|---+       |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |     | | | | |     | | | |       |   | 
+ |   | | | | |   | | | | | | +---------|---|-----|-------------------------------------|-----------|---------------------|-|---|-|---------|-----|---------------|-----+ | | | |     | | | |       |   | 
+ |   | | | | |   | | | | | | | | | |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |       | | | |     | | | |       |   | 
+ |   +-----|-|---|-|-|---|-|-----+ |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |       | | | |     | | | |       |   | 
+ |     | | | |   | | | | | | | |   |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |       | | | |     | | | |       |   | 
+ |     +-|-|-|---|---|-|-|-------+ |   |   |   | |                 +-----+ | | | |     | |       +---------------------+ | |   | |         |     |         | +-------------|-|---------|---|-----------+ 
+ |       | | |   | | | | | | | | | |   |   |   | |                       | | | | |     | |       | |         |         | | |   | |         |     |         |     |       | | | |     | | | |       |     
+ |       | | |   | | | | | | | | | | +-----------|-----------------------|-|---------------------|---------------------|-----------+ +-----------|---------+     |       | | | |     | | | |       |     
+ |       | | |   | | | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |       | | | |     | | | |       |     
+ +-------|-|-|-----+ | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |       +-|---|-+   | | | |       |     
+         | | |   |   | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |       |     
+         | +-------+ | | | | | | | | | +---------|-------------------------------+     | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |   +---+     
+         |   |   | | | | | | | | | | |     |   | |                       | | | |       | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |   |         
+         |   |   +-|-|-----|---|-|-|-|-------------------------------------|-|-------------------------------|---------|-|-|-----|-|-------------+               |         | | | |   | | +-------------+ 
+         |   |     | | | | | | | | | |     |   | |                       | | | |       | |       | |         |         | | |   | | | |     |                     |         | | | |   | |   |   |       | 
+   +---------|---+ | | | | | | | +-----+   |   | |                       | | | |     +-|-|-------------------|---------|---|-----|---|-----|-----------------------+       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | |   | | |   |   | |                       | | | |     | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | +---|---------------------------------------|---+   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   +-----|-|---------|-|---------------|-----------------------|-|---------|-|-|-------------------|-+       | | |   | | | |     |                     | |       | | | |   | |   |   |   +-+ | 
+   |     |       | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         | |       | | |   | | | |     |                     | |       | | | |   | |   |   |   | | | 
+ +---------------|-----|---------------|---|---|---------+         +-----+ | | | +-----|-|-------|-+   +---------------|-|-|---|-|---------|---------------------|-|-----------|-----|-----|---|-+ | | | 
+ | |     |       | | | | | | | | | | | |   |   | |       |         |       | | |     | | |       |     |     | |       | | |   | | | |     |                     | |       | | | |   | |   |   | | | | | 
+ | |     |       | +-|-------|-|---|---|-------|---------|-------------------|-|---------|-------------------------------|-----|-|-|-|---------------------------|---------|-----|---|-----|-+ | | | | | 
+ | |     |       |   | | | | | | | | | |   |   | |       |         |       | | |     | | |       |     |     | |       | | |   | | | |     |                     | |       | | | |   | |   | | | | | | | 
+ | |     |       | +-|---|---|-|-+ | | | +-----|-|-------|---------------------|-+   | | | +-----------|-------|---------|-|-----|-|-------|-------+             | | +-+   | +-|-|-----|-+ | | | | | | | 
+ | |     |       | | | | | | | |   | | | | |   | |       |         |       | | | |   | | | |     |     |     | |       | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | +-+   | | | | | | | |   | | | | |   | |       |   +-----|-----------------|-|---|-----|-----------|-----+   | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | | |   | | | | | | | |   | | | | |   | |       |   |     |       | | | |   | | | |     |     |     | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | U | | | | | | | 
+ | |     | | |   | | | | | | | | +-----|-|-------|-----------|-----------------------------------------|---+ | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | | |   | | | | | | | | | | | | | |   | |       |   |     |       | | | |   | | | |     |     |   | | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | | |   | | | | +-----|-|---|-|---|-----|-----------|-----|-------|---|-|---|-|-|-----------+ |   | | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | | |   | | | |   | | | | | | | | |   | |       |   |     |       | | | |   | | | |     |   | |   | | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | | | | | | | | | 
+ | |     | | |   | | | |   | | | | | | | | |   | |       |   |     |       | | | |   | | | | +---|---|-|-----------|---|-|-|-------|-|-----|-------|-------------------|----------------E--+ | | | | | | 
+ | |     | | |   | | | |   | | | | | | | | |   | |       |   |     |       | | | |   | | | | |   |   | |   | | |   |   | | |   | | | |     |       |             | | | |   |   | |   | | |   | | | | | | 
+ | |     | | |   | | | |   | | | | | | | | |   | +-------|---|---------------|-------|-----|---+ |   | | +-|-------|---|-|-|---|-|-|-----------------------------|---|-----|-----|-------+ +---|-------+ 
+ | |     | | |   | | | |   | | | | | | | | |   |         |   |     |       | | | |   | | | | | | |   | | | | | |   |   | | |   | | | |     |       |             | | | |   |   | |   | |   | | | | | |   
+ | |     | | |   | +---|---|-|-|-|---|---|-----|---------------------------|-|-------|---|---+ | +---|---|-|-------|-----|-|-+ | | | +-----+       |             | | | |   |   | |   | |   | | | | | |   
+ | |     | | |   |   | |   | | | | | | | | |   |         |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | | | |               |             | | | |   |   | |   | |   | | | | | |   
+ | | +---|-|-+   |   | |   | | | | | | | | |   |         |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | | +-|-----------------------------|-|-|---------------|-------|-----|---+ 
+ | | |   | |     |   | |   | | | | | | | | |   |         |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | |   |               |             | | | |   |   | |   | |   | | | | | | | 
+ | | |   | |     |   | |   | | | | | | | | |   | +-----------------|-----------|-----------|-----------------------|-------|-|-|-----------------------+         | | | |   |   | |   | |   | | | | | | | 
+ | | |   | |     |   | |   | | | | | | | | |   | |       |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | |   |               |   |         | | | |   |   | |   | |   | | | | | | | 
+ | | |   | |     |   | |   | | | | | | | | |   | | +---------------|-------------|---|---|-|---------|-|---------------|---|-|-----|-------------------|-----------|---|---|---------|-+ +-|-+ | | | | | 
+ | | |   | |     |   | |   | | | | | | | | |   | | |     |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | |   |               |   |         | | | |   |   | |   |   | |   | | | | | 
+ | | +---|-|-----|-----|---|---|---------|-|-----------------|---------------|-------------|-------------|-|---|---------|-----|-----------------------------+   | | | |   |   | |   |   | |   | | | | | 
+ | |     | |     |   | |   | | | | | | | | |   | | |     |   |     |       | | | |   | | | |   |     | | | | | |   |   | | | | |   |               |   |     |   | | | |   |   | |   |   | |   | | | | | 
+ | |     | |     |   | |   | | | | | | | | |   | | |     |   |     |       | | | |   | | | |   |   +---------|-----|-----|-----------------------------------|---|-|---|---------|-+ |   | |   | | | | | 
+ | |     | |     |   | |   | | | | | | | | |   | | |     |   |     |       | | | |   | | | |   |   | | | | | | |   |   | | | | |   |               |   |     |   | | | |   |   | | | |   | |   | | | | | 
+ | |     | |     |   | |   | | | | | | | | |   | | |     |   | +---|---------|-|-|-+ | | | |   |   | | | | | | |   |   | | | | |   |               |   |     |   | | | |   |   | | | |   | | +-|---|---+ 
+ | |     | |     |   | |   | | | | | | | | |   | | |     |   | |   |       | | | | | | | | |   |   | | | | | | |   |   | | | | |   |               |   |     |   | | | |   |   | | | |   | | | | | | |   
+ | |     | |     | +-|-----|---|-|---|---|-|---------------+ | | +-|-------|-------|-----------+   +-|-|-|-|---|-------|-|---|---------------------|-------+ |   | +---+   |   | +-|-----|---+ | | | |   
+ | |     | |     | | | |   | | | | | | | | |   | | |     | | | | | |       | | | | | | | | |         | | | | | |   |   | | | | |   |               |   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | +-----------|-|-|---------|-|---|---|-----|-|---------------|-----+   | | | | | +-|-|-----+   +-|-|-|---|-|---+   | | | | |   |               |   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   | |     | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | | | |   | | |   |   | | | | | | |       | | | | |   |               |   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   | +-+   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | | | |   | | |   |   | | | | | | |       | | | | |   |               |   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | | | |   | | |   |   | | | | | | |       | | | | |   |               |   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | | +-----|-+ | +-------+ | | +-----------|-|-------------------------+   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | |   |   |   | | |   |   | |   | |       | | | | |   |                   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | | +---|---------+ | | +-|-|-|-------|-----|-|-----------|-------------|-|---|---|-----+ |       | | | | |   |                   |   | |   |   | +---|---|-+ | |   | |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | | | |     N | | | | |   |   | | |   |   |   | | |   |   | |     |       | | | | |   |                   |   | |   |   | |   |   | | | |   | |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | | +-|-----|---|-+ | | +-----|---|-------------|-|-------+ |     |   +---|---|-|-----|-----------------------------|---|-|--D|---|-----|---+ |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | |   |     | | |   | | | |   | | |   |   |   | | |   |     |     |   |   | | | | |   |                   |   | |   |   | |   |   | | | |     |   | | | |   
+ | | |   |   +---|---|-|-----|-|-|-|-----|-|---|-----------|-|-----|-|-----|-|-----|---|-------|---------------|-------|-|---------|-------------------|---------|-----|---|---|-|---|-----|---|-+ | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     | | |   | | | |   | | |   |   |   | | |   |     |     |   |   | | | | |   |                   |   | |   |   | |   |   | | | |     |   |   | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     | +-------|-|-----|-|-|-----------|-|-+   |     |     |   |   | | | | |   |               +-------|---------+ |   |   | | | |   +-------+ | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |   | |     |     |     |   |   | | | | |   |               |   |   | |   |     |   |   | | | |   | |   | | | |   
+ | | |   | +-------|---+ | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |   +-+   +-|-----|-----|---+   | | | | |   |       +-------|---------|---------+   |   | | | |   | |   | | | |   
+ | | |   | |     | | |   | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   | | | |   | |   | | | |   
+ | | | +---|-------+ | +-----------|-------|-----+ |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   | +---|---+ |   | | | |   
+ | | | | | |     |   | | | | | | | | |   | | | | | |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | | +-|-|-----|-------|-|-|-----|-----------|-+ |     |   |   | | | |   | +-|-------+         | |   +---------------+ | +-+ |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | |   | |     |   | | | | | | | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | +---|-----------|-------|-+ | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   | +---|-------------|---+ |     |   | | | |   
+ | |     | |     |   | | | | |   | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   |     |         |   |     |     |   | | | |   
+ | | +---|-------|-----|---|-------------|-|---|---|---------|---|---|-|-----+ |   |   +---------|-|---|-|-----|-------------------|-------|-------+   |   |     |         |   |     |     |   | | | |   
+ | | |   | |     |   | | | | |   | | |   | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |       |           |   |     |         |   |     |     |   | | | |   
+ | | |   | |     |   | | | | |   | | | +---|-|-----|---------------|-|---------|---|---|---------|-|---------------------|-----|---|-------+           |   |     |         |   |     |   +-|---|-+ | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |     |   | |   |   | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |   +-----|-------+ | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   +-|-------|---|---|---|---------|-----+ |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |   |         | |     |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | | +-|-+     |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |   +-----------------|-----|---------|-----------------------------|---------|-------------|---|-|---|-|-----+ | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |             | |     |     |         |     |   |                   |   |     |         |   |   | |   | |   |   | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | | +-----------------|-------------|---------|-----+   |                   |   +---------------|---|---|-+   | |   |   | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | |     |             | |     |     |         |         |                   |         |         |   |   |     | |   |   | |   
+ | | | | | +-------------|-|-|-----|---|---|-|-|---------|---|---------|---------------------------|-----|-----|---------|---------|-------------------|---------|---------+   |   |     | |   |   | |   
+ | | | | | |     |   | | | | |   | | | | | | | |   |     |   |     | | |   | |     |             | |     |     |         |         |                   |         |             |   |     | |   |   | |   
+ | | | | | +---------|-+ | +-----|-|-|---|-|-|---+ |     |   |     | | |   | |     +---------------------------|-------------------|-------------+     +---------|----------Y--+   |     | |   | +---|-+ 
+ | | | | |       |   |   |   |   | | | | | | | | | |     |   |     | | |   | |                   | |     |     |         |         |             |               |                 |     | |   | | | | | 
+ | | | | |       | +-|---|-----------|---------|---------|---|---------|---|-----+           +---|-|-----|-----|---------+         |             |   +-----------------------------+     | |   | | | | | 
+ | | | | |       | | |   |   |   | | | | | | | | | |     |   |     | | |   | |   |           |   | |     |     |                   |             |   |           |                       | |   | | | | | 
+ | | | | |       | | |   |   |   | | | | | +-----|-|-----|---|-------|-|---|-----|-----------------------------|---------------------------------|---|-------------------------------------|-----+ | | | 
+ | | | | |       | | |   |   |   | | | | |   | | | |     |   |     | | |   | |   |           |   | |     |     |                   |             |   |           |                       | |   |   | | | 
+ | | | | |       | | |   | +-|---|-------|-------|-|-----|---|-----|---------+   |           |   | |     +-------------+           |             |   |           |                       | |   |   | | | 
+ | | | | |       | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                       | |   |   | | | 
+ | +-|---|-------|-------|---|-----|-|-------|-|-|-|---------------|-|-----|-----|---------------|-|-----------|-------|-----------|-------------|---|-----------|-------------------------------+ | | | 
+ |   | | |       | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                       | |   | | | | | 
+ |   | | | +---------|-------|---|-|-|-|---------|-|-----|---|-----|---|---|-----------------|---|-------------|---------------+   |             |   |           |                       +-+   | | | +-+ 
+ |   | | | |     | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |       |   |             |   |           |                             | | |     
+ |   +-|-|---+   | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |       +---|-----------------|---------------------------------------------|---+ 
+ |     | | | |   | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                             | | |   | 
+ |     | | | |   | | |   | | |   | | | | |   | | | +---+ |   |     | | +---+     |           |   | |           |       |           |         +---|-----------+   |                             | | | +-+ 
+ |     | | | |   | | |   | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                             | | | |   
+ |     | | | |   +-|-+   | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                 +-----------|-|---+   
+ |     | | | |     |     | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                 |           | | |     
+ |   +-|---|-------------|---|---|-|---------------+   | |   |     | |           |           |   | |           |       |           |         |   |   |       +---|-----------------|-----+     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | +-------|-----|-|-|---|-|---+ +---|-|-------|-|---------|-|-----------|---------------|-|---+       |       |           |         |   |   |           |                 | +---|-------|-+     
+ |   | | |   |     |     | | |   | | |       | | | |   | |   |     | |           |           |   | |   |       |       |           |         |   |   |           |                 | |   |     | |       
+ | +-+ | | +-|-----------|-|-----|---|---------+ | |   | |   |     | |           |           |   | |   |       |       |           |         |   +---------------|-----------------|-+   |     | |       
+ | |   | | | |     |     | | |   | | |       |   | |   | |   |     | |           |           |   | |   |       |       |           |         |       |           |                 |     |     | |       
+ | |   | | | |     |     | | |   | | |       +---|-|---|-|---|-----|-|-----------------------|---|-----|-------|-------|-----------|---------|-------------------|-----+           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |   |     | |           |           |   | |   |       |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |   +-----------------------------------|-----------+ |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |         | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | +-----|-----|---|O------------------|-|---|-|---+     | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | | |       |     | | |   | | |           | |   | |   |     | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | +-|---------------|-----|---|-----------|-----|-|---+     | |           |           |   | |   |     | |       |           |         |       |     +-----|-----|-----------+     +-----+ |       
+ | |   |   |       |     | | |   | | |           | |   | |         | |           |           |   | |   |     | |       |           |         |       |     |     |     |                         |       
+ | |   +-----------|-----+ | |   | | |           | |   | |         | +-----------|-----------|-------------------------|-----------------------------|-----------------|-------------------------+       
+ | |       |       |       | |   | | |           | |   | |         |             |           |   | |   |     | |       |           |         |       |     |     |     |                                 
+ | | +-------------|-------|-----|-|-|-----------------|-|-----------------------------------|-----|---|-----|---------|-----------------------------|-----------|---------------------+                 
+ | | |     |       |       | |   | | |           | |   | |         |             |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | |     |       |       | |   | | |           | +-----------------+           |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | |     |       |       | |   | | |           |     | |         | |           |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | +-+ +-----+ +---------|-----|-------------------|-----------|-----------------+       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |       |         | |   | | |           |     | |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |   +-----------+ | |   +-|-|-----------|-----+ |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |   |   |       | | |     | |           |       |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | | +-|-+ |       +-|-+     | |           |       |         | |           |   |       |   | |   |     | |       |           |         |   +---|-----+     |     |               |                 
+ | | | | | | | | |         |       | |           |       |         | |           |   |       |   | |   |     | |       |           |         |   |   |           |     |               |                 
+ | | | | | | | | +-----+   +---------|-----------|-------|---------|-------+     |   |       |   +-+   | +-------------------------|-------------|---|-----------|---------------------+                 
+ | | | | | | | |       |           | |           |       |         | |     |     |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | | | | | | | |       |           | |           |       |         | +-----+     |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | | | | | | | |       |           | |           |       |         |             |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | +-+ | | | +-----------------------|-----------|-------|---------|-------+   +-|---+     +-----------+ |   | |       +-------------------------|-+ |           |     |                                 
+ |     | | |   |       |           | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ |     | | +---|-------|-+         | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ |     | |     |       | |         | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ +-------|-------------|-------------|-------------------|---------|---------+ | |         | +-----------|-----+                   |         |   | | |           |     |                                 
+       | |     |       | |         | |           |       |         |       | | | |         |             |   |                     |         |   | | |           |     |                                 
+       +-|-+   |   +---|-+         | |           +-----------------|---------+ | +---------+             |   |                     |         |   | | |           |     |                                 
+         | |   |   |   |           | |                   |         |       |   |                         |   |                     |         |   | | |           |     |                                 
+         | +---+   +---------+     | +---------------------------------------+ |         +---------------+   |                     |         |   | | |           |     +-------------------+             
+         |             |     |     |                     |         |       | | |         |                   |                     |         |   | | |           |                         |             
+         +-+           +-----+     +---------------------|---------|-----------+         +-------------------|-------------------------------+   +-+ |           |                         |             
+           |                                             |         |       | |                               |                     |                 |           |                         |             
+           |                                             +-------------------+                               |                     |                 +-----------+                         |             
+           |                                                       |       |                                 |                     |                                                       |             
+           +-------------------------------------------------------+       +---------------------------------+                     +-------------------------------------------------------+             
+                                                                                                                                                                                                         
diff --git a/2017/d19/ex2/ex2.py b/2017/d19/ex2/ex2.py
new file mode 100755
index 0000000..ce27c01
--- /dev/null
+++ b/2017/d19/ex2/ex2.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+
+import enum
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.Enum):
+    UP = Point(-1, 0)
+    DOWN = Point(1, 0)
+    LEFT = Point(0, -1)
+    RIGHT = Point(0, 1)
+
+    def apply(self, p: Point) -> Point:
+        dx, dy = self.value
+        return Point(p.x + dx, p.y + dy)
+
+    def turns(self) -> Iterator["Direction"]:
+        match self:
+            case Direction.UP | Direction.DOWN:
+                turns = (Direction.LEFT, Direction.RIGHT)
+            case Direction.LEFT | Direction.RIGHT:
+                turns = (Direction.UP, Direction.DOWN)
+        yield from turns
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> dict[Point, str]:
+        return {
+            Point(x, y): c
+            for x, line in enumerate(input.splitlines())
+            for y, c in enumerate(line)
+            if c != " "
+        }
+
+    def packet_walk(map: dict[Point, str]) -> int:
+        letters: list[str] = []
+        # Travel starts downward, from outside the map before the first line
+        pos = min(map.keys(), key=lambda p: p.x)
+        dir = Direction.DOWN
+
+        steps = 0
+        while True:
+            if (letter := map[pos]) not in ("+", "|", "-"):
+                letters.append(letter)
+            new_dir = dir
+            new_pos = dir.apply(pos)
+            steps += 1
+            if new_pos not in map:
+                for new_dir in dir.turns():
+                    if (new_pos := new_dir.apply(pos)) in map:
+                        break
+                else:
+                    # Must be the end of the line, stop looping
+                    return steps
+            dir = new_dir
+            pos = new_pos
+
+    map = parse(input)
+    return packet_walk(map)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d19/ex2/input b/2017/d19/ex2/input
new file mode 100644
index 0000000..2a3c8fc
--- /dev/null
+++ b/2017/d19/ex2/input
@@ -0,0 +1,201 @@
+                                                                                                             |                                                                                           
+     +---+     +-------------------------------+         +---+     +---------+   +---------------------------|-------------------------------------------------------------------------+ +-----+         
+     |   |     |                               |         |   |     |         |   |                           |                                                                         | |     |         
+     |   +-----|---------+         +---------------------|---|-----|-------------|---------------------------|-------------------------------------------------------------------------+ |     +-------+ 
+     |         |         |         |           |         |   |     |         |   |                           |                                                                           |             | 
+     |     +---+     +---------+   |           |         |   | +-------------------------------------------------------------------------------------------------------+   A-+ +-----------------------+ 
+     |     |         |   |     |   |           |         |   | |   |         |   |                           |                                                         |     | |         |               
+     |     |         |   |     |   |   +---------------------|-----|---------|-----------+                   |                     +-----------------------------------------------+     |               
+     |     |         |   |     |   |   |       |         |   | |   |         |   |       |                   |                     |                                   |     | |   |     |               
+     |     |         |   |     |   |   |       |         |   | |   +---------|-----------|-------------------|---------------------|-----------------------------------------|-----------|-------------+ 
+     |     R         |   |     |   |   |       |         |   | |             |   |       |                   |                     |                                   |     | |   |     |             | 
+     |     |         |   | +-------|---------------------------|-------------|-----------|-------------------|---------------------|-------------+         +-----------|-----|-----|-----+     +-------+ 
+     |     |         |   | |   |   |   |       |         |   | |             |   |       |                   |                     |             |         |           |     | |   |           |         
+     |     +---------|-------+ |   |   |       |         |   +-|---------+ +-|---|-----+ | +-----------------|---------------------|-------+     |         |         +-|-----|-|---|-----------------+   
+     |               |   | | | |   |   |       |         |     |         | | |   |     | | |                 |                     |       |     |         |         | |     | |   |           |     |   
+ +-------------------|-----|-|-|-------|-------|---------|-----+         | | |   |     | | +-----------------|---------------------------------------------|---------|---------|---|-----------+     |   
+ |   |               |   | | | |   |   |       |         |               | | |   |     | |                   |                     |       |     |         |         | |     | |   |                 |   
+ | +-----+           +---|---|-----|---|-----------------|-----------------|-----------|-|-------------------------------------+   |       |     |         +---------|-|---+ +-|---------------------+   
+ | | |   |               | | | |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |   |   |   |                     
+ | +-+   |               | | | |   |   |       |         |               | | |   |     +---------------------|-----------------------------|-----|-------------------|-|---+   |   |                     
+ |       |               | | | |   |   |       |         |               | | |   |       |                   |                 |   |       |     |                   | |       |   |                     
+ |     +---------------------+ |   |   |       |         |               | | |   |     +-|-----------------------------------------|-------|-------------------------|-|-------|-------+             +-+ 
+ |     | |               | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   |   |             | | 
+ |     | | +---------+   | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   | +---------------+ | 
+ |     | | |         |   | |   |   |   |       |         |               | | |   |     | |                   |                 |   |       |     |                   | |       |   | | |               | 
+ +---+ | | | +-+     |   | |   |   +-----+     |       +-|---------------+ | | +-|-------|-------------------|-+               |   |       |     |                   | |       |   | | |               | 
+     | | | | | |     |   | |   |       | |     |       | |                 | | | |     | |                   | |               |   |       |     |                   | |       |   | W |               | 
+ +-------|-|-|-|-+   |   | |   |       | +-------------|-------------------|-|-|-------|-|-------------------------------------|-----------|-----------------+       +-|-----------|-----------------+ | 
+ |   | | | | | | |   |   | |   |       |       |       | |                 | | | |     | |                   | H               |   |       |     |           |         |       |   | | |             | | 
+ |   | +-|-------+   |   | |   |       |       |       | |                 | | | |     | |         +---------|---------------------|-------|-----|---------------------------------|-|---------------+ | 
+ |   |   | | | |     |   | |   |       |       |       | |                 | | | |     | |         |         | |               |   |       |     |           |         |       |   | | |               | 
+ |   +-----|-|---+   |   | |   +---+   |       |       +-|-----------------------|-----|-------+   |         | |               |   |       |     |           |         |       |   +-|-|-------------+ | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         | |               |   |       |     |           |         |       |     | |             | | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         | +-------------------|-------|-----|---------+ |         | +---------------+           | | 
+ |       | | | | |   |   | |       |   |       |         |                 | | | |     | |     |   |         |                 |   |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |       |   | +-+   |         |                 | | | |     | |     +-------------|-----------------|-+ |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |       |   | | |   |         |                 | | | |     | |         |         |                 | | |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |     +-----------------------------------------|-----|-------|---------|---------|-----------+     | | |       |     |         | |         | |     |     | | |           | | 
+ |       | | | | |   |   | |     | |   | | |   |         |                 | | | |     | |         |         |           |     | | |       |     |         | |         | |     |     | | |           | | 
+ |     +-|-|-|-+ |   |   | |   +-|-|-------|-------------------------------|-|---|-----|-|---------|---------|-----------|-------|-+       |     |         | |         | | +-+ |     | | |         +-+ | 
+ |     | | | |   |   |   | |   | | |   | | |   |         |                 | | | |     | |         |         |           |     | |         |     |         | |         | | | | |     | | |         |   | 
+ |   +-|---------|-+ | +---------|-|---|-+ |   | +-------+         +-------|-|---------|---------------------|-----------|-----------------------------------|---+     | | | | |     | | |         |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           |     | |         |     |         | |   |     | | | | |     | | |         |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           | +-------------------------------------------|-----|-|-------|---+       |   | 
+ |   | | | | |   | | | | | |   | | |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |     | | | | |     | | | |       |   | 
+ |   | | | | |   | | | | | | +---------|---|-----|-------------------------------------|-----------|---------------------|-|---|-|---------|-----|---------------|-----+ | | | |     | | | |       |   | 
+ |   | | | | |   | | | | | | | | | |   |   |   | |                 |       | | | |     | |         |         |           | |   | |         |     |         | |   |       | | | |     | | | |       |   | 
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+ |     +-|-|-|---|---|-|-|-------+ |   |   |   | |                 +-----+ | | | |     | |       +---------------------+ | |   | |         |     |         | +-------------|-|---------|---|-----------+ 
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+ |       | | |   | | | | | | | | | | +-----------|-----------------------|-|---------------------|---------------------|-----------+ +-----------|---------+     |       | | | |     | | | |       |     
+ |       | | |   | | | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |       | | | |     | | | |       |     
+ +-------|-|-|-----+ | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |       +-|---|-+   | | | |       |     
+         | | |   |   | | | | | | | | | |   |   | |                       | | | | |     | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |       |     
+         | +-------+ | | | | | | | | | +---------|-------------------------------+     | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |   +---+     
+         |   |   | | | | | | | | | | |     |   | |                       | | | |       | |       | |         |         | | |   | | | |     |     |               |         | | | |   | | | |   |         
+         |   |   +-|-|-----|---|-|-|-|-------------------------------------|-|-------------------------------|---------|-|-|-----|-|-------------+               |         | | | |   | | +-------------+ 
+         |   |     | | | | | | | | | |     |   | |                       | | | |       | |       | |         |         | | |   | | | |     |                     |         | | | |   | |   |   |       | 
+   +---------|---+ | | | | | | | +-----+   |   | |                       | | | |     +-|-|-------------------|---------|---|-----|---|-----|-----------------------+       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | |   | | |   |   | |                       | | | |     | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | +---|---------------------------------------|---+   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
+   |     |   |   | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         |         | | |   | | | |     |                     | |       | | | |   | |   |   |       | 
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+   |     |   +-----|-|---------|-|---------------|-----------------------|-|---------|-|-|-------------------|-+       | | |   | | | |     |                     | |       | | | |   | |   |   |   +-+ | 
+   |     |       | | | | | | | | | | | |   |   | |                       | | | | |   | | |       | |         | |       | | |   | | | |     |                     | |       | | | |   | |   |   |   | | | 
+ +---------------|-----|---------------|---|---|---------+         +-----+ | | | +-----|-|-------|-+   +---------------|-|-|---|-|---------|---------------------|-|-----------|-----|-----|---|-+ | | | 
+ | |     |       | | | | | | | | | | | |   |   | |       |         |       | | |     | | |       |     |     | |       | | |   | | | |     |                     | |       | | | |   | |   |   | | | | | 
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+ | |     |       |   | | | | | | | | | |   |   | |       |         |       | | |     | | |       |     |     | |       | | |   | | | |     |                     | |       | | | |   | |   | | | | | | | 
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+ | |     | | |   | | | |   | | | | | | | | |   | |       |   |     |       | | | |   | | | | +---|---|-|-----------|---|-|-|-------|-|-----|-------|-------------------|----------------E--+ | | | | | | 
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+ | |     | |     | +-|-----|---|-|---|---|-|---------------+ | | +-|-------|-------|-----------+   +-|-|-|-|---|-------|-|---|---------------------|-------+ |   | +---+   |   | +-|-----|---+ | | | |   
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+ | | |   |   |   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | | +-----|-+ | +-------+ | | +-----------|-|-------------------------+   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | |   | | | | | | | | |   | | |     | | | | | |   |   | | |   |   |   | | |   |   | |   | |       | | | | |   |                   |   | |   |   |     |   |   | |   | |   | | | |   
+ | | |   |   |   | | | | +---|---------+ | | +-|-|-|-------|-----|-|-----------|-------------|-|---|---|-----+ |       | | | | |   |                   |   | |   |   | +---|---|-+ | |   | |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | | | |     N | | | | |   |   | | |   |   |   | | |   |   | |     |       | | | | |   |                   |   | |   |   | |   |   | | | |   | |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | | +-|-----|---|-+ | | +-----|---|-------------|-|-------+ |     |   +---|---|-|-----|-----------------------------|---|-|--D|---|-----|---+ |   | | | |   
+ | | |   |   |   | | | | | | | | | | |   | | | |   |     | | |   | | | |   | | |   |   |   | | |   |     |     |   |   | | | | |   |                   |   | |   |   | |   |   | | | |     |   | | | |   
+ | | |   |   +---|---|-|-----|-|-|-|-----|-|---|-----------|-|-----|-|-----|-|-----|---|-------|---------------|-------|-|---------|-------------------|---------|-----|---|---|-|---|-----|---|-+ | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     | | |   | | | |   | | |   |   |   | | |   |     |     |   |   | | | | |   |                   |   | |   |   | |   |   | | | |     |   |   | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     | +-------|-|-----|-|-|-----------|-|-+   |     |     |   |   | | | | |   |               +-------|---------+ |   |   | | | |   +-------+ | |   
+ | | |   |       | | | | | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |   | |     |     |     |   |   | | | | |   |               |   |   | |   |     |   |   | | | |   | |   | | | |   
+ | | |   | +-------|---+ | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |   +-+   +-|-----|-----|---+   | | | | |   |       +-------|---------|---------+   |   | | | |   | |   | | | |   
+ | | |   | |     | | |   | | | | | | |   | | | |   |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   | | | |   | |   | | | |   
+ | | | +---|-------+ | +-----------|-------|-----+ |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   | +---|---+ |   | | | |   
+ | | | | | |     |   | | | | | | | | |   | | | | | |     |   |   | | | |   | | |   |   |         | |     |     |       | | | | |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | | +-|-|-----|-------|-|-|-----|-----------|-+ |     |   |   | | | |   | +-|-------+         | |   +---------------+ | +-+ |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | |   | |     |   | | | | | | | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   | |   |         |   |   | |     |   | | | |   
+ | | +---|-----------|-------|-+ | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   | +---|-------------|---+ |     |   | | | |   
+ | |     | |     |   | | | | |   | | |   | | | |   |     |   |   | | | |   |   |   |             | |   | |     |         |     |   |       |       |   |   |     |         |   |     |     |   | | | |   
+ | | +---|-------|-----|---|-------------|-|---|---|---------|---|---|-|-----+ |   |   +---------|-|---|-|-----|-------------------|-------|-------+   |   |     |         |   |     |     |   | | | |   
+ | | |   | |     |   | | | | |   | | |   | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |       |           |   |     |         |   |     |     |   | | | |   
+ | | |   | |     |   | | | | |   | | | +---|-|-----|---------------|-|---------|---|---|---------|-|---------------------|-----|---|-------+           |   |     |         |   |     |   +-|---|-+ | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |     |   | |   |   | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |   +-----|-------+ | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   | | | |   | | |   |   |         | |   | |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |   +-|-------|---|---|---|---------|-----+ |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | |   | |     |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |   |         | |     |     |         |     |   |                   |   |     |         |   |   | |   | |   | | | |   
+ | | | +-|-+     |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |   +-----------------|-----|---------|-----------------------------|---------|-------------|---|-|---|-|-----+ | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | | |   |             | |     |     |         |     |   |                   |   |     |         |   |   | |   | |   |   | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | | +-----------------|-------------|---------|-----+   |                   |   +---------------|---|---|-+   | |   |   | |   
+ | | | | |       |   | | | | |   | | | | | | | |   |     |   |     | | |   | |     |             | |     |     |         |         |                   |         |         |   |   |     | |   |   | |   
+ | | | | | +-------------|-|-|-----|---|---|-|-|---------|---|---------|---------------------------|-----|-----|---------|---------|-------------------|---------|---------+   |   |     | |   |   | |   
+ | | | | | |     |   | | | | |   | | | | | | | |   |     |   |     | | |   | |     |             | |     |     |         |         |                   |         |             |   |     | |   |   | |   
+ | | | | | +---------|-+ | +-----|-|-|---|-|-|---+ |     |   |     | | |   | |     +---------------------------|-------------------|-------------+     +---------|----------Y--+   |     | |   | +---|-+ 
+ | | | | |       |   |   |   |   | | | | | | | | | |     |   |     | | |   | |                   | |     |     |         |         |             |               |                 |     | |   | | | | | 
+ | | | | |       | +-|---|-----------|---------|---------|---|---------|---|-----+           +---|-|-----|-----|---------+         |             |   +-----------------------------+     | |   | | | | | 
+ | | | | |       | | |   |   |   | | | | | | | | | |     |   |     | | |   | |   |           |   | |     |     |                   |             |   |           |                       | |   | | | | | 
+ | | | | |       | | |   |   |   | | | | | +-----|-|-----|---|-------|-|---|-----|-----------------------------|---------------------------------|---|-------------------------------------|-----+ | | | 
+ | | | | |       | | |   |   |   | | | | |   | | | |     |   |     | | |   | |   |           |   | |     |     |                   |             |   |           |                       | |   |   | | | 
+ | | | | |       | | |   | +-|---|-------|-------|-|-----|---|-----|---------+   |           |   | |     +-------------+           |             |   |           |                       | |   |   | | | 
+ | | | | |       | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                       | |   |   | | | 
+ | +-|---|-------|-------|---|-----|-|-------|-|-|-|---------------|-|-----|-----|---------------|-|-----------|-------|-----------|-------------|---|-----------|-------------------------------+ | | | 
+ |   | | |       | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                       | |   | | | | | 
+ |   | | | +---------|-------|---|-|-|-|---------|-|-----|---|-----|---|---|-----------------|---|-------------|---------------+   |             |   |           |                       +-+   | | | +-+ 
+ |   | | | |     | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |       |   |             |   |           |                             | | |     
+ |   +-|-|---+   | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |       +---|-----------------|---------------------------------------------|---+ 
+ |     | | | |   | | |   | | |   | | | | |   | | | |     |   |     | | |   |     |           |   | |           |       |           |             |   |           |                             | | |   | 
+ |     | | | |   | | |   | | |   | | | | |   | | | +---+ |   |     | | +---+     |           |   | |           |       |           |         +---|-----------+   |                             | | | +-+ 
+ |     | | | |   | | |   | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                             | | | |   
+ |     | | | |   +-|-+   | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                 +-----------|-|---+   
+ |     | | | |     |     | | |   | | | | |   | | |     | |   |     | |           |           |   | |           |       |           |         |   |   |       |   |                 |           | | |     
+ |   +-|---|-------------|---|---|-|---------------+   | |   |     | |           |           |   | |           |       |           |         |   |   |       +---|-----------------|-----+     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | | |     |     | | |   | | | | |   | | | |   | |   |     | |           |           |   | |           |       |           |         |   |   |           |                 |     |     | | |     
+ |   | | | +-------|-----|-|-|---|-|---+ +---|-|-------|-|---------|-|-----------|---------------|-|---+       |       |           |         |   |   |           |                 | +---|-------|-+     
+ |   | | |   |     |     | | |   | | |       | | | |   | |   |     | |           |           |   | |   |       |       |           |         |   |   |           |                 | |   |     | |       
+ | +-+ | | +-|-----------|-|-----|---|---------+ | |   | |   |     | |           |           |   | |   |       |       |           |         |   +---------------|-----------------|-+   |     | |       
+ | |   | | | |     |     | | |   | | |       |   | |   | |   |     | |           |           |   | |   |       |       |           |         |       |           |                 |     |     | |       
+ | |   | | | |     |     | | |   | | |       +---|-|---|-|---|-----|-|-----------------------|---|-----|-------|-------|-----------|---------|-------------------|-----+           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |   |     | |           |           |   | |   |       |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |   +-----------------------------------|-----------+ |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | |     |     | | |   | | |           | |   | |         | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | | | +-----|-----|---|O------------------|-|---|-|---+     | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | | |       |     | | |   | | |           | |   | |   |     | |           |           |   | |   |     | |       |           |         |       |           |     |           |     |     | |       
+ | |   | +-|---------------|-----|---|-----------|-----|-|---+     | |           |           |   | |   |     | |       |           |         |       |     +-----|-----|-----------+     +-----+ |       
+ | |   |   |       |     | | |   | | |           | |   | |         | |           |           |   | |   |     | |       |           |         |       |     |     |     |                         |       
+ | |   +-----------|-----+ | |   | | |           | |   | |         | +-----------|-----------|-------------------------|-----------------------------|-----------------|-------------------------+       
+ | |       |       |       | |   | | |           | |   | |         |             |           |   | |   |     | |       |           |         |       |     |     |     |                                 
+ | | +-------------|-------|-----|-|-|-----------------|-|-----------------------------------|-----|---|-----|---------|-----------------------------|-----------|---------------------+                 
+ | | |     |       |       | |   | | |           | |   | |         |             |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | |     |       |       | |   | | |           | +-----------------+           |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | |     |       |       | |   | | |           |     | |         | |           |           |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | +-+ +-----+ +---------|-----|-------------------|-----------|-----------------+       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |       |         | |   | | |           |     | |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |   +-----------+ | |   +-|-|-----------|-----+ |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | |   |   |       | | |     | |           |       |         | |           |   |       |   | |   |     | |       |           |         |       |     |     |     |               |                 
+ | | | | | +-|-+ |       +-|-+     | |           |       |         | |           |   |       |   | |   |     | |       |           |         |   +---|-----+     |     |               |                 
+ | | | | | | | | |         |       | |           |       |         | |           |   |       |   | |   |     | |       |           |         |   |   |           |     |               |                 
+ | | | | | | | | +-----+   +---------|-----------|-------|---------|-------+     |   |       |   +-+   | +-------------------------|-------------|---|-----------|---------------------+                 
+ | | | | | | | |       |           | |           |       |         | |     |     |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | | | | | | | |       |           | |           |       |         | +-----+     |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | | | | | | | |       |           | |           |       |         |             |   |       |         | |   | |       |           |         |   |   |           |     |                                 
+ | +-+ | | | +-----------------------|-----------|-------|---------|-------+   +-|---+     +-----------+ |   | |       +-------------------------|-+ |           |     |                                 
+ |     | | |   |       |           | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ |     | | +---|-------|-+         | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ |     | |     |       | |         | |           |       |         |       |   | |         | |           |   | |                   |         |   | | |           |     |                                 
+ +-------|-------------|-------------|-------------------|---------|---------+ | |         | +-----------|-----+                   |         |   | | |           |     |                                 
+       | |     |       | |         | |           |       |         |       | | | |         |             |   |                     |         |   | | |           |     |                                 
+       +-|-+   |   +---|-+         | |           +-----------------|---------+ | +---------+             |   |                     |         |   | | |           |     |                                 
+         | |   |   |   |           | |                   |         |       |   |                         |   |                     |         |   | | |           |     |                                 
+         | +---+   +---------+     | +---------------------------------------+ |         +---------------+   |                     |         |   | | |           |     +-------------------+             
+         |             |     |     |                     |         |       | | |         |                   |                     |         |   | | |           |                         |             
+         +-+           +-----+     +---------------------|---------|-----------+         +-------------------|-------------------------------+   +-+ |           |                         |             
+           |                                             |         |       | |                               |                     |                 |           |                         |             
+           |                                             +-------------------+                               |                     |                 +-----------+                         |             
+           |                                                       |       |                                 |                     |                                                       |             
+           +-------------------------------------------------------+       +---------------------------------+                     +-------------------------------------------------------+             
+                                                                                                                                                                                                         
diff --git a/2017/d20/ex1/ex1.py b/2017/d20/ex1/ex1.py
new file mode 100755
index 0000000..887f911
--- /dev/null
+++ b/2017/d20/ex1/ex1.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+    z: int
+
+
+class Particle(NamedTuple):
+    pos: Point
+    vel: Point
+    acc: Point
+
+    @classmethod
+    def from_str(cls, input: str) -> "Particle":
+        p, v, a = input.split(", ")
+        return cls(
+            Point(*map(int, p[3:-1].split(","))),
+            Point(*map(int, v[3:-1].split(","))),
+            Point(*map(int, a[3:-1].split(","))),
+        )
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Particle]:
+        return [Particle.from_str(line) for line in input.splitlines()]
+
+    def dist(point: Point, other: Point) -> int:
+        return sum(abs(a - b) for a, b in zip(point, other))
+
+    particles = parse(input)
+    orig = Point(0, 0, 0)
+    # Lowest acceleration will be closest to origin as time tends to infinity
+    # Same logic for velocity and position
+    closest_particle = min(
+        particles,
+        key=lambda p: (dist(p.acc, orig), dist(p.vel, orig), dist(p.pos, orig)),
+    )
+    return particles.index(closest_particle)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d20/ex1/input b/2017/d20/ex1/input
new file mode 100644
index 0000000..d30ed99
--- /dev/null
+++ b/2017/d20/ex1/input
@@ -0,0 +1,1000 @@
+p=<1500,413,-535>, v=<-119,22,36>, a=<-5,-12,3>
+p=<65,1223,-530>, v=<-14,-136,52>, a=<2,2,0>
+p=<260,-387,800>, v=<49,14,-103>, a=<-13,4,4>
+p=<429,726,462>, v=<-36,-36,-19>, a=<0,-6,-4>
+p=<1705,-165,1331>, v=<-134,9,-104>, a=<-3,0,-3>
+p=<341,693,-473>, v=<-28,9,-18>, a=<0,-13,10>
+p=<2816,-2250,1464>, v=<-91,41,149>, a=<-4,6,-20>
+p=<-1237,-1704,-531>, v=<47,125,35>, a=<1,-4,-1>
+p=<-4828,-171,-447>, v=<86,8,-24>, a=<13,0,4>
+p=<2553,3286,-5524>, v=<-128,45,41>, a=<3,-9,8>
+p=<1065,8038,-3700>, v=<1,-87,17>, a=<-2,-10,6>
+p=<1081,-4698,860>, v=<50,113,-43>, a=<-5,2,1>
+p=<-4103,102,-7540>, v=<47,-37,137>, a=<5,2,6>
+p=<2985,-3162,1516>, v=<40,65,-47>, a=<-8,2,0>
+p=<8089,4886,-2404>, v=<-4,28,26>, a=<-15,-11,3>
+p=<-188,492,143>, v=<29,78,-27>, a=<-2,-13,2>
+p=<1556,2084,1247>, v=<-97,-115,-45>, a=<0,-2,-4>
+p=<220,-404,-1241>, v=<-39,-2,0>, a=<3,3,9>
+p=<-948,908,751>, v=<102,-16,-99>, a=<-5,-5,6>
+p=<676,-2628,-1641>, v=<-8,52,59>, a=<-4,13,5>
+p=<-1636,-204,2167>, v=<77,11,-77>, a=<3,0,-7>
+p=<-92,-212,615>, v=<23,-65,37>, a=<-2,9,-9>
+p=<660,1700,-1217>, v=<-75,-40,41>, a=<4,-8,4>
+p=<2428,-284,1007>, v=<-143,-35,-30>, a=<-1,6,-4>
+p=<2516,-3412,-577>, v=<-4,101,1>, a=<-18,13,4>
+p=<-1551,-1873,-3487>, v=<29,-15,-125>, a=<1,4,13>
+p=<-276,3805,-2229>, v=<-61,98,13>, a=<4,-12,3>
+p=<-752,5811,1239>, v=<-12,-66,-19>, a=<2,-6,-1>
+p=<-6736,1782,-13636>, v=<24,70,156>, a=<10,-7,14>
+p=<1169,-819,2123>, v=<124,-81,-45>, a=<-9,6,-1>
+p=<31,-1310,-640>, v=<-8,167,15>, a=<0,-9,6>
+p=<-1895,-1544,878>, v=<68,76,-53>, a=<13,8,-3>
+p=<2382,126,1908>, v=<-112,-6,8>, a=<1,0,-7>
+p=<18,-3462,288>, v=<-1,81,13>, a=<0,5,-2>
+p=<-1958,317,-1998>, v=<173,40,64>, a=<-7,-6,4>
+p=<-818,507,-136>, v=<13,140,-14>, a=<3,-17,2>
+p=<3362,-640,-138>, v=<-32,44,18>, a=<-16,-1,-1>
+p=<50,-1351,303>, v=<-19,17,22>, a=<2,6,-4>
+p=<896,-244,-2424>, v=<-123,-16,31>, a=<8,3,11>
+p=<50,197,726>, v=<0,-12,8>, a=<0,0,-5>
+p=<698,-2431,2949>, v=<2,77,-144>, a=<-4,6,-2>
+p=<-202,-226,-21>, v=<14,97,-17>, a=<0,-9,2>
+p=<-1363,998,168>, v=<50,-47,1>, a=<3,-1,-1>
+p=<2039,476,1554>, v=<-101,115,0>, a=<-1,-15,-9>
+p=<-2992,1664,-2190>, v=<150,-27,113>, a=<2,-7,1>
+p=<-4132,2004,373>, v=<47,-37,18>, a=<11,-4,-3>
+p=<-1694,2004,-2433>, v=<37,-97,68>, a=<3,1,3>
+p=<-1326,-2320,-1835>, v=<33,103,78>, a=<2,0,0>
+p=<-1027,1682,1247>, v=<-40,-47,-116>, a=<7,-2,5>
+p=<-337,2234,534>, v=<14,-47,-1>, a=<0,-4,-2>
+p=<2745,3016,-202>, v=<-24,-81,-29>, a=<-8,-4,3>
+p=<-1343,-3402,1983>, v=<99,84,-43>, a=<-2,13,-8>
+p=<-272,1460,1303>, v=<-72,-31,-111>, a=<10,-6,4>
+p=<1377,-2348,130>, v=<-52,67,21>, a=<-3,8,-3>
+p=<2482,1409,1371>, v=<-135,-100,-7>, a=<-1,2,-8>
+p=<136,-3334,-2879>, v=<-15,134,108>, a=<1,7,7>
+p=<-2754,-614,-873>, v=<74,1,-55>, a=<10,4,12>
+p=<136,950,-431>, v=<-6,17,27>, a=<0,-8,0>
+p=<272,-1940,-1502>, v=<-5,142,45>, a=<-1,-3,5>
+p=<952,-1532,-2743>, v=<-54,-26,118>, a=<0,13,5>
+p=<646,4570,-4911>, v=<-54,-65,-31>, a=<2,-4,10>
+p=<-7837,3193,-5948>, v=<73,-77,17>, a=<9,-1,9>
+p=<1666,3686,6547>, v=<21,-109,-53>, a=<-4,0,-8>
+p=<-1731,-1228,580>, v=<163,24,-58>, a=<2,18,0>
+p=<399,422,-2410>, v=<-6,-42,197>, a=<-6,0,8>
+p=<7537,-5727,-3546>, v=<-129,57,14>, a=<-12,12,9>
+p=<-6802,2710,-6328>, v=<58,-11,67>, a=<15,-7,13>
+p=<-2616,-3153,1771>, v=<32,120,-15>, a=<5,0,-4>
+p=<1804,1046,5307>, v=<-84,-55,-70>, a=<1,1,-10>
+p=<2233,-2321,445>, v=<-60,61,-18>, a=<-2,2,0>
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+p=<373,2363,-928>, v=<52,335,-130>, a=<0,-20,8>
+p=<-16,923,3038>, v=<0,125,435>, a=<0,-11,-30>
+p=<-582,-2415,-1123>, v=<-84,-349,-157>, a=<5,20,18>
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+p=<-1880,419,-2597>, v=<-271,63,-374>, a=<18,-4,25>
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+p=<951,-2678,-2019>, v=<133,-382,-289>, a=<-7,23,20>
+p=<384,1486,2761>, v=<54,207,394>, a=<-4,-11,-26>
+p=<-2164,1308,-2362>, v=<-308,186,-343>, a=<23,-12,23>
+p=<1636,-2395,-677>, v=<233,-344,-102>, a=<-17,19,7>
+p=<-836,2716,802>, v=<-116,390,114>, a=<5,-26,-8>
+p=<-1017,2318,-1502>, v=<-148,331,-212>, a=<14,-22,14>
+p=<-8,2290,-2327>, v=<-1,326,-336>, a=<0,-26,23>
+p=<957,-475,-2503>, v=<135,-71,-363>, a=<-7,4,21>
+p=<-1802,1695,-2518>, v=<-262,242,-356>, a=<17,-16,22>
+p=<-1918,1084,978>, v=<-273,152,140>, a=<19,-8,-9>
+p=<-2718,-511,267>, v=<-390,-70,38>, a=<22,0,-5>
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+p=<2919,720,-429>, v=<418,105,-59>, a=<-30,-11,4>
+p=<-127,-208,-2528>, v=<-17,-29,-361>, a=<-2,2,24>
+p=<2588,-1533,325>, v=<369,-224,46>, a=<-25,15,-5>
+p=<2240,755,1445>, v=<321,110,206>, a=<-20,-8,-11>
+p=<-1025,-2658,396>, v=<-144,-381,56>, a=<9,22,4>
+p=<-1591,-1577,-2200>, v=<-227,-229,-312>, a=<17,13,22>
+p=<2320,-2390,453>, v=<328,-346,65>, a=<-19,26,-3>
+p=<-2665,277,577>, v=<-379,37,82>, a=<25,1,-5>
+p=<-244,-314,2533>, v=<-36,-49,359>, a=<-2,4,-24>
+p=<1363,1901,-1003>, v=<198,268,-143>, a=<-15,-20,10>
+p=<-1982,-2008,-666>, v=<-279,-286,-93>, a=<15,21,6>
+p=<404,1110,-2724>, v=<57,152,-390>, a=<-5,-11,25>
+p=<1106,-29,2811>, v=<157,-5,397>, a=<-4,-1,-29>
+p=<1279,-1327,-2438>, v=<176,-186,-347>, a=<-16,13,23>
+p=<-2442,-1060,-1808>, v=<-348,-152,-261>, a=<25,9,17>
+p=<-2764,706,766>, v=<-392,99,116>, a=<26,-4,-11>
+p=<398,-961,-2682>, v=<51,-137,-388>, a=<-2,9,30>
+p=<1783,-461,-1623>, v=<258,-68,-234>, a=<-19,5,13>
+p=<164,-766,-3613>, v=<24,-107,-517>, a=<2,9,39>
+p=<-2002,-2461,-920>, v=<-287,-349,-131>, a=<24,21,4>
+p=<770,493,3153>, v=<112,71,450>, a=<-4,-1,-35>
+p=<-864,477,-3078>, v=<-120,73,-439>, a=<7,-6,29>
+p=<1315,2948,-955>, v=<185,418,-134>, a=<-12,-27,10>
+p=<1168,2186,-1475>, v=<165,308,-215>, a=<-11,-16,14>
+p=<1883,1702,1906>, v=<270,252,273>, a=<-20,-13,-18>
+p=<-2462,-1690,-48>, v=<-353,-241,-8>, a=<24,15,2>
+p=<-1016,1706,2368>, v=<-144,242,341>, a=<7,-21,-20>
+p=<2752,1230,178>, v=<394,178,26>, a=<-23,-16,-1>
+p=<-3139,492,-93>, v=<-446,70,-14>, a=<31,-6,0>
+p=<-232,-669,3400>, v=<-35,-95,487>, a=<-1,3,-29>
+p=<521,-4,2511>, v=<73,0,361>, a=<-8,3,-33>
+p=<-1580,-2272,-2040>, v=<-224,-323,-292>, a=<15,20,20>
+p=<2936,10,680>, v=<419,1,100>, a=<-33,1,-7>
+p=<3134,29,491>, v=<450,8,66>, a=<-31,4,0>
+p=<2028,-2215,730>, v=<286,-317,101>, a=<-17,17,-6>
+p=<-942,2508,227>, v=<-132,360,34>, a=<6,-18,-2>
+p=<-2074,-337,-2307>, v=<-292,-51,-325>, a=<17,9,25>
+p=<3138,-829,906>, v=<448,-116,129>, a=<-27,8,-3>
+p=<417,-1567,2520>, v=<60,-223,357>, a=<-7,8,-29>
+p=<-591,2981,-253>, v=<-79,425,-35>, a=<9,-29,2>
+p=<-428,2571,-2295>, v=<-65,372,-326>, a=<-1,-25,23>
+p=<-1147,-2613,-1664>, v=<-163,-373,-239>, a=<10,32,17>
+p=<-682,2368,720>, v=<-96,338,106>, a=<10,-27,-10>
+p=<414,2028,-1676>, v=<65,286,-239>, a=<-6,-20,16>
+p=<80,2771,-1315>, v=<8,395,-188>, a=<0,-25,13>
+p=<-571,765,-2510>, v=<-80,110,-354>, a=<1,-10,31>
+p=<1755,-2364,-196>, v=<251,-339,-30>, a=<-16,25,-1>
+p=<-995,-2303,54>, v=<-141,-327,13>, a=<6,21,3>
+p=<987,-1899,-2046>, v=<141,-272,-292>, a=<-9,18,25>
+p=<-230,-841,-2371>, v=<-31,-118,-337>, a=<2,5,23>
+p=<2201,-1834,1184>, v=<312,-262,169>, a=<-22,20,-7>
+p=<2301,277,-1316>, v=<331,41,-186>, a=<-22,3,11>
+p=<-2248,1705,39>, v=<-320,240,10>, a=<19,-15,1>
+p=<-1825,2384,950>, v=<-264,341,136>, a=<20,-23,-4>
+p=<2159,583,-2049>, v=<306,85,-291>, a=<-17,2,20>
+p=<752,-306,-2743>, v=<110,-44,-391>, a=<-7,3,28>
+p=<-1600,733,2474>, v=<-228,102,353>, a=<16,-4,-29>
+p=<-1931,-2210,-1867>, v=<-276,-309,-267>, a=<18,24,14>
+p=<-1295,-2031,1686>, v=<-184,-292,239>, a=<12,21,-15>
+p=<478,-2672,-94>, v=<69,-381,-17>, a=<-2,23,0>
+p=<1317,662,2146>, v=<184,91,301>, a=<-16,-4,-19>
+p=<761,-2068,1675>, v=<109,-295,240>, a=<-5,20,-13>
+p=<3126,878,1183>, v=<444,125,167>, a=<-29,-5,-8>
+p=<1005,-2563,-549>, v=<146,-368,-80>, a=<-15,25,4>
+p=<2042,-1193,-2128>, v=<290,-166,-300>, a=<-17,15,22>
+p=<200,-1578,2895>, v=<26,-223,413>, a=<-4,11,-28>
+p=<-986,2686,-304>, v=<-138,378,-38>, a=<9,-26,5>
+p=<2871,-1251,358>, v=<411,-175,52>, a=<-28,17,0>
+p=<1868,319,-2475>, v=<267,45,-348>, a=<-18,-3,22>
+p=<2451,19,-1262>, v=<352,-1,-183>, a=<-25,0,12>
+p=<1585,2301,-869>, v=<231,330,-120>, a=<-10,-23,7>
+p=<2502,1759,-696>, v=<357,257,-102>, a=<-24,-19,6>
+p=<2305,537,-2463>, v=<332,77,-348>, a=<-22,-8,18>
+p=<-255,2470,-1500>, v=<-35,349,-217>, a=<6,-22,12>
+p=<-236,2477,-1290>, v=<-37,350,-184>, a=<6,-24,15>
+p=<2401,258,1682>, v=<343,36,238>, a=<-21,-2,-16>
+p=<-674,2633,130>, v=<-96,377,22>, a=<7,-32,0>
+p=<-682,-183,-2591>, v=<-95,-27,-365>, a=<6,6,22>
+p=<-153,2400,-2116>, v=<-24,340,-304>, a=<2,-25,20>
+p=<-1243,2187,1831>, v=<-177,311,261>, a=<13,-22,-18>
+p=<1115,-2968,-411>, v=<164,-423,-63>, a=<-5,31,5>
+p=<2669,-425,-1805>, v=<381,-55,-256>, a=<-26,4,19>
+p=<-1819,-1005,-1806>, v=<-259,-146,-254>, a=<13,9,22>
+p=<2727,-746,-1095>, v=<388,-107,-161>, a=<-21,7,10>
+p=<2988,-1385,-756>, v=<431,-194,-105>, a=<-31,12,9>
+p=<1892,-843,-2112>, v=<270,-120,-295>, a=<-18,8,18>
+p=<981,-1233,2354>, v=<140,-176,335>, a=<-7,11,-21>
+p=<-798,910,2557>, v=<-114,134,367>, a=<9,-9,-28>
+p=<1357,3162,599>, v=<193,457,83>, a=<-12,-31,-6>
+p=<2670,1729,-42>, v=<383,245,-2>, a=<-29,-17,2>
+p=<-1459,-1028,2060>, v=<-208,-142,297>, a=<17,8,-17>
+p=<-166,-236,2935>, v=<-20,-33,417>, a=<-2,0,-29>
+p=<3032,-500,391>, v=<440,-72,55>, a=<-35,10,1>
+p=<1867,1954,117>, v=<266,282,16>, a=<-11,-15,1>
+p=<165,1444,2170>, v=<20,206,312>, a=<-2,-10,-19>
+p=<-2105,-2100,395>, v=<-303,-300,51>, a=<23,21,-3>
+p=<-975,2566,-2097>, v=<-141,364,-304>, a=<5,-26,20>
+p=<2688,-678,-926>, v=<383,-97,-136>, a=<-28,6,9>
+p=<-331,-3031,-174>, v=<-43,-435,-21>, a=<4,33,4>
+p=<-1036,-2037,-1769>, v=<-149,-290,-254>, a=<8,27,17>
+p=<443,-1213,-2648>, v=<60,-173,-386>, a=<-8,14,26>
+p=<-2666,220,1758>, v=<-380,31,253>, a=<27,1,-16>
+p=<1168,2827,1304>, v=<169,403,184>, a=<-11,-27,-11>
+p=<1237,645,2828>, v=<176,89,403>, a=<-11,-3,-27>
+p=<-194,-718,2500>, v=<-26,-97,355>, a=<2,2,-25>
+p=<-1738,-1623,1459>, v=<-246,-231,207>, a=<20,18,-14>
+p=<607,-1729,-2554>, v=<87,-244,-363>, a=<-5,17,21>
+p=<-772,2981,-1709>, v=<-108,429,-248>, a=<6,-29,13>
+p=<-929,-935,2559>, v=<-131,-133,366>, a=<8,9,-27>
+p=<1889,-2222,2>, v=<273,-315,-4>, a=<-23,24,2>
+p=<2252,-1177,-1148>, v=<317,-163,-169>, a=<-22,7,14>
+p=<898,1129,1677>, v=<128,160,240>, a=<-8,-11,-18>
+p=<585,1776,-1605>, v=<86,257,-232>, a=<-3,-11,11>
+p=<1329,-702,2447>, v=<188,-99,350>, a=<-20,5,-24>
+p=<-740,-1556,-2238>, v=<-104,-219,-317>, a=<9,19,22>
+p=<1221,2376,-501>, v=<176,343,-70>, a=<-13,-23,2>
+p=<-18,-582,-2939>, v=<-1,-83,-416>, a=<0,11,31>
+p=<328,-1362,2407>, v=<47,-192,345>, a=<-1,11,-24>
+p=<2254,-795,-2176>, v=<319,-115,-306>, a=<-17,7,20>
+p=<1945,2178,374>, v=<273,308,54>, a=<-22,-23,-3>
+p=<-1255,1542,-2209>, v=<-182,220,-315>, a=<11,-15,23>
+p=<-1029,1657,2328>, v=<-148,234,331>, a=<16,-16,-27>
+p=<299,2821,-1374>, v=<44,402,-193>, a=<-7,-25,13>
+p=<-2317,106,-1824>, v=<-331,20,-262>, a=<23,-1,13>
+p=<784,-2450,-1388>, v=<116,-346,-195>, a=<-11,26,14>
+p=<2738,-544,-356>, v=<393,-77,-49>, a=<-26,10,-3>
+p=<1355,1483,2334>, v=<195,211,331>, a=<-12,-19,-17>
+p=<2570,-849,-414>, v=<369,-117,-60>, a=<-21,9,9>
+p=<313,-1203,-2974>, v=<41,-173,-422>, a=<-4,16,26>
+p=<133,-3658,193>, v=<22,-524,27>, a=<-4,42,2>
+p=<1293,-1644,2714>, v=<179,-232,383>, a=<-12,15,-33>
+p=<152,1845,1804>, v=<24,263,261>, a=<-1,-14,-18>
+p=<1059,2077,-1799>, v=<154,296,-251>, a=<-7,-19,13>
+p=<-2954,-985,167>, v=<-418,-140,23>, a=<29,7,-3>
diff --git a/2017/d20/ex2/ex2.py b/2017/d20/ex2/ex2.py
new file mode 100755
index 0000000..d451315
--- /dev/null
+++ b/2017/d20/ex2/ex2.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+    z: int
+
+
+class Particle(NamedTuple):
+    pos: Point
+    vel: Point
+    acc: Point
+
+    @classmethod
+    def from_str(cls, input: str) -> "Particle":
+        p, v, a = input.split(", ")
+        return cls(
+            Point(*map(int, p[3:-1].split(","))),
+            Point(*map(int, v[3:-1].split(","))),
+            Point(*map(int, a[3:-1].split(","))),
+        )
+
+    def tick(self) -> "Particle":
+        pos, vel, acc = self
+        vel = Point(*((v + a) for v, a in zip(vel, acc)))
+        pos = Point(*((p + v) for p, v in zip(pos, vel)))
+        return Particle(pos, vel, acc)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Particle]:
+        return [Particle.from_str(line) for line in input.splitlines()]
+
+    def tick(particles: list[Particle]) -> list[Particle]:
+        particles = [p.tick() for p in particles]
+        positions = collections.Counter(p.pos for p in particles)
+        return [p for p in particles if positions[p.pos] == 1]
+
+    particles = parse(input)
+    # Guesstimate that 1000 iterations is enough to process all colisions
+    for _ in range(1000):
+        particles = tick(particles)
+    return len(particles)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d20/ex2/input b/2017/d20/ex2/input
new file mode 100644
index 0000000..d30ed99
--- /dev/null
+++ b/2017/d20/ex2/input
@@ -0,0 +1,1000 @@
+p=<1500,413,-535>, v=<-119,22,36>, a=<-5,-12,3>
+p=<65,1223,-530>, v=<-14,-136,52>, a=<2,2,0>
+p=<260,-387,800>, v=<49,14,-103>, a=<-13,4,4>
+p=<429,726,462>, v=<-36,-36,-19>, a=<0,-6,-4>
+p=<1705,-165,1331>, v=<-134,9,-104>, a=<-3,0,-3>
+p=<341,693,-473>, v=<-28,9,-18>, a=<0,-13,10>
+p=<2816,-2250,1464>, v=<-91,41,149>, a=<-4,6,-20>
+p=<-1237,-1704,-531>, v=<47,125,35>, a=<1,-4,-1>
+p=<-4828,-171,-447>, v=<86,8,-24>, a=<13,0,4>
+p=<2553,3286,-5524>, v=<-128,45,41>, a=<3,-9,8>
+p=<1065,8038,-3700>, v=<1,-87,17>, a=<-2,-10,6>
+p=<1081,-4698,860>, v=<50,113,-43>, a=<-5,2,1>
+p=<-4103,102,-7540>, v=<47,-37,137>, a=<5,2,6>
+p=<2985,-3162,1516>, v=<40,65,-47>, a=<-8,2,0>
+p=<8089,4886,-2404>, v=<-4,28,26>, a=<-15,-11,3>
+p=<-188,492,143>, v=<29,78,-27>, a=<-2,-13,2>
+p=<1556,2084,1247>, v=<-97,-115,-45>, a=<0,-2,-4>
+p=<220,-404,-1241>, v=<-39,-2,0>, a=<3,3,9>
+p=<-948,908,751>, v=<102,-16,-99>, a=<-5,-5,6>
+p=<676,-2628,-1641>, v=<-8,52,59>, a=<-4,13,5>
+p=<-1636,-204,2167>, v=<77,11,-77>, a=<3,0,-7>
+p=<-92,-212,615>, v=<23,-65,37>, a=<-2,9,-9>
+p=<660,1700,-1217>, v=<-75,-40,41>, a=<4,-8,4>
+p=<2428,-284,1007>, v=<-143,-35,-30>, a=<-1,6,-4>
+p=<2516,-3412,-577>, v=<-4,101,1>, a=<-18,13,4>
+p=<-1551,-1873,-3487>, v=<29,-15,-125>, a=<1,4,13>
+p=<-276,3805,-2229>, v=<-61,98,13>, a=<4,-12,3>
+p=<-752,5811,1239>, v=<-12,-66,-19>, a=<2,-6,-1>
+p=<-6736,1782,-13636>, v=<24,70,156>, a=<10,-7,14>
+p=<1169,-819,2123>, v=<124,-81,-45>, a=<-9,6,-1>
+p=<31,-1310,-640>, v=<-8,167,15>, a=<0,-9,6>
+p=<-1895,-1544,878>, v=<68,76,-53>, a=<13,8,-3>
+p=<2382,126,1908>, v=<-112,-6,8>, a=<1,0,-7>
+p=<18,-3462,288>, v=<-1,81,13>, a=<0,5,-2>
+p=<-1958,317,-1998>, v=<173,40,64>, a=<-7,-6,4>
+p=<-818,507,-136>, v=<13,140,-14>, a=<3,-17,2>
+p=<3362,-640,-138>, v=<-32,44,18>, a=<-16,-1,-1>
+p=<50,-1351,303>, v=<-19,17,22>, a=<2,6,-4>
+p=<896,-244,-2424>, v=<-123,-16,31>, a=<8,3,11>
+p=<50,197,726>, v=<0,-12,8>, a=<0,0,-5>
+p=<698,-2431,2949>, v=<2,77,-144>, a=<-4,6,-2>
+p=<-202,-226,-21>, v=<14,97,-17>, a=<0,-9,2>
+p=<-1363,998,168>, v=<50,-47,1>, a=<3,-1,-1>
+p=<2039,476,1554>, v=<-101,115,0>, a=<-1,-15,-9>
+p=<-2992,1664,-2190>, v=<150,-27,113>, a=<2,-7,1>
+p=<-4132,2004,373>, v=<47,-37,18>, a=<11,-4,-3>
+p=<-1694,2004,-2433>, v=<37,-97,68>, a=<3,1,3>
+p=<-1326,-2320,-1835>, v=<33,103,78>, a=<2,0,0>
+p=<-1027,1682,1247>, v=<-40,-47,-116>, a=<7,-2,5>
+p=<-337,2234,534>, v=<14,-47,-1>, a=<0,-4,-2>
+p=<2745,3016,-202>, v=<-24,-81,-29>, a=<-8,-4,3>
+p=<-1343,-3402,1983>, v=<99,84,-43>, a=<-2,13,-8>
+p=<-272,1460,1303>, v=<-72,-31,-111>, a=<10,-6,4>
+p=<1377,-2348,130>, v=<-52,67,21>, a=<-3,8,-3>
+p=<2482,1409,1371>, v=<-135,-100,-7>, a=<-1,2,-8>
+p=<136,-3334,-2879>, v=<-15,134,108>, a=<1,7,7>
+p=<-2754,-614,-873>, v=<74,1,-55>, a=<10,4,12>
+p=<136,950,-431>, v=<-6,17,27>, a=<0,-8,0>
+p=<272,-1940,-1502>, v=<-5,142,45>, a=<-1,-3,5>
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+p=<-32,-2568,1670>, v=<-4,-370,242>, a=<3,25,-14>
+p=<1565,1932,454>, v=<223,277,66>, a=<-15,-19,-3>
+p=<-1345,2918,-69>, v=<-192,416,-11>, a=<10,-25,1>
+p=<-2085,-271,-1874>, v=<-297,-38,-263>, a=<20,4,23>
+p=<2111,-2280,-74>, v=<305,-322,-6>, a=<-22,24,-4>
+p=<12,-488,3282>, v=<6,-69,462>, a=<-4,6,-35>
+p=<-829,-937,2551>, v=<-116,-137,367>, a=<3,12,-23>
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+p=<666,553,-3136>, v=<94,80,-448>, a=<-5,-5,28>
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+p=<1104,-320,2444>, v=<158,-44,354>, a=<-11,2,-23>
+p=<-187,-1095,2647>, v=<-26,-156,376>, a=<-1,12,-21>
+p=<-1421,-2357,200>, v=<-201,-333,33>, a=<15,21,2>
+p=<1877,90,2147>, v=<273,12,309>, a=<-16,0,-21>
+p=<-1880,419,-2597>, v=<-271,63,-374>, a=<18,-4,25>
+p=<-1609,414,-2417>, v=<-229,59,-351>, a=<10,-1,24>
+p=<-1480,2235,-210>, v=<-210,316,-30>, a=<12,-20,0>
+p=<-1941,743,2365>, v=<-277,110,337>, a=<15,-7,-25>
+p=<1495,-2896,1065>, v=<214,-412,152>, a=<-11,26,-10>
+p=<-2038,541,1731>, v=<-286,80,245>, a=<15,-6,-13>
+p=<1316,175,-2635>, v=<187,26,-378>, a=<-10,-1,27>
+p=<1778,1932,-399>, v=<254,274,-57>, a=<-16,-20,3>
+p=<-2497,84,472>, v=<-355,12,70>, a=<24,0,-6>
+p=<566,-1984,-1067>, v=<77,-285,-155>, a=<-2,22,11>
+p=<-1138,420,-3082>, v=<-157,62,-440>, a=<15,-1,34>
+p=<789,-2022,2212>, v=<115,-290,317>, a=<-10,16,-25>
+p=<354,-2402,-1538>, v=<50,-343,-214>, a=<-2,22,15>
+p=<-1233,-3403,-289>, v=<-181,-482,-40>, a=<14,28,2>
+p=<-2416,-1448,462>, v=<-346,-204,70>, a=<24,12,-3>
+p=<676,-2408,-1515>, v=<88,-343,-221>, a=<-6,23,14>
+p=<795,420,-2555>, v=<106,57,-366>, a=<-6,-5,24>
+p=<951,-2678,-2019>, v=<133,-382,-289>, a=<-7,23,20>
+p=<384,1486,2761>, v=<54,207,394>, a=<-4,-11,-26>
+p=<-2164,1308,-2362>, v=<-308,186,-343>, a=<23,-12,23>
+p=<1636,-2395,-677>, v=<233,-344,-102>, a=<-17,19,7>
+p=<-836,2716,802>, v=<-116,390,114>, a=<5,-26,-8>
+p=<-1017,2318,-1502>, v=<-148,331,-212>, a=<14,-22,14>
+p=<-8,2290,-2327>, v=<-1,326,-336>, a=<0,-26,23>
+p=<957,-475,-2503>, v=<135,-71,-363>, a=<-7,4,21>
+p=<-1802,1695,-2518>, v=<-262,242,-356>, a=<17,-16,22>
+p=<-1918,1084,978>, v=<-273,152,140>, a=<19,-8,-9>
+p=<-2718,-511,267>, v=<-390,-70,38>, a=<22,0,-5>
+p=<-931,741,-2861>, v=<-135,107,-409>, a=<4,-8,27>
+p=<2919,720,-429>, v=<418,105,-59>, a=<-30,-11,4>
+p=<-127,-208,-2528>, v=<-17,-29,-361>, a=<-2,2,24>
+p=<2588,-1533,325>, v=<369,-224,46>, a=<-25,15,-5>
+p=<2240,755,1445>, v=<321,110,206>, a=<-20,-8,-11>
+p=<-1025,-2658,396>, v=<-144,-381,56>, a=<9,22,4>
+p=<-1591,-1577,-2200>, v=<-227,-229,-312>, a=<17,13,22>
+p=<2320,-2390,453>, v=<328,-346,65>, a=<-19,26,-3>
+p=<-2665,277,577>, v=<-379,37,82>, a=<25,1,-5>
+p=<-244,-314,2533>, v=<-36,-49,359>, a=<-2,4,-24>
+p=<1363,1901,-1003>, v=<198,268,-143>, a=<-15,-20,10>
+p=<-1982,-2008,-666>, v=<-279,-286,-93>, a=<15,21,6>
+p=<404,1110,-2724>, v=<57,152,-390>, a=<-5,-11,25>
+p=<1106,-29,2811>, v=<157,-5,397>, a=<-4,-1,-29>
+p=<1279,-1327,-2438>, v=<176,-186,-347>, a=<-16,13,23>
+p=<-2442,-1060,-1808>, v=<-348,-152,-261>, a=<25,9,17>
+p=<-2764,706,766>, v=<-392,99,116>, a=<26,-4,-11>
+p=<398,-961,-2682>, v=<51,-137,-388>, a=<-2,9,30>
+p=<1783,-461,-1623>, v=<258,-68,-234>, a=<-19,5,13>
+p=<164,-766,-3613>, v=<24,-107,-517>, a=<2,9,39>
+p=<-2002,-2461,-920>, v=<-287,-349,-131>, a=<24,21,4>
+p=<770,493,3153>, v=<112,71,450>, a=<-4,-1,-35>
+p=<-864,477,-3078>, v=<-120,73,-439>, a=<7,-6,29>
+p=<1315,2948,-955>, v=<185,418,-134>, a=<-12,-27,10>
+p=<1168,2186,-1475>, v=<165,308,-215>, a=<-11,-16,14>
+p=<1883,1702,1906>, v=<270,252,273>, a=<-20,-13,-18>
+p=<-2462,-1690,-48>, v=<-353,-241,-8>, a=<24,15,2>
+p=<-1016,1706,2368>, v=<-144,242,341>, a=<7,-21,-20>
+p=<2752,1230,178>, v=<394,178,26>, a=<-23,-16,-1>
+p=<-3139,492,-93>, v=<-446,70,-14>, a=<31,-6,0>
+p=<-232,-669,3400>, v=<-35,-95,487>, a=<-1,3,-29>
+p=<521,-4,2511>, v=<73,0,361>, a=<-8,3,-33>
+p=<-1580,-2272,-2040>, v=<-224,-323,-292>, a=<15,20,20>
+p=<2936,10,680>, v=<419,1,100>, a=<-33,1,-7>
+p=<3134,29,491>, v=<450,8,66>, a=<-31,4,0>
+p=<2028,-2215,730>, v=<286,-317,101>, a=<-17,17,-6>
+p=<-942,2508,227>, v=<-132,360,34>, a=<6,-18,-2>
+p=<-2074,-337,-2307>, v=<-292,-51,-325>, a=<17,9,25>
+p=<3138,-829,906>, v=<448,-116,129>, a=<-27,8,-3>
+p=<417,-1567,2520>, v=<60,-223,357>, a=<-7,8,-29>
+p=<-591,2981,-253>, v=<-79,425,-35>, a=<9,-29,2>
+p=<-428,2571,-2295>, v=<-65,372,-326>, a=<-1,-25,23>
+p=<-1147,-2613,-1664>, v=<-163,-373,-239>, a=<10,32,17>
+p=<-682,2368,720>, v=<-96,338,106>, a=<10,-27,-10>
+p=<414,2028,-1676>, v=<65,286,-239>, a=<-6,-20,16>
+p=<80,2771,-1315>, v=<8,395,-188>, a=<0,-25,13>
+p=<-571,765,-2510>, v=<-80,110,-354>, a=<1,-10,31>
+p=<1755,-2364,-196>, v=<251,-339,-30>, a=<-16,25,-1>
+p=<-995,-2303,54>, v=<-141,-327,13>, a=<6,21,3>
+p=<987,-1899,-2046>, v=<141,-272,-292>, a=<-9,18,25>
+p=<-230,-841,-2371>, v=<-31,-118,-337>, a=<2,5,23>
+p=<2201,-1834,1184>, v=<312,-262,169>, a=<-22,20,-7>
+p=<2301,277,-1316>, v=<331,41,-186>, a=<-22,3,11>
+p=<-2248,1705,39>, v=<-320,240,10>, a=<19,-15,1>
+p=<-1825,2384,950>, v=<-264,341,136>, a=<20,-23,-4>
+p=<2159,583,-2049>, v=<306,85,-291>, a=<-17,2,20>
+p=<752,-306,-2743>, v=<110,-44,-391>, a=<-7,3,28>
+p=<-1600,733,2474>, v=<-228,102,353>, a=<16,-4,-29>
+p=<-1931,-2210,-1867>, v=<-276,-309,-267>, a=<18,24,14>
+p=<-1295,-2031,1686>, v=<-184,-292,239>, a=<12,21,-15>
+p=<478,-2672,-94>, v=<69,-381,-17>, a=<-2,23,0>
+p=<1317,662,2146>, v=<184,91,301>, a=<-16,-4,-19>
+p=<761,-2068,1675>, v=<109,-295,240>, a=<-5,20,-13>
+p=<3126,878,1183>, v=<444,125,167>, a=<-29,-5,-8>
+p=<1005,-2563,-549>, v=<146,-368,-80>, a=<-15,25,4>
+p=<2042,-1193,-2128>, v=<290,-166,-300>, a=<-17,15,22>
+p=<200,-1578,2895>, v=<26,-223,413>, a=<-4,11,-28>
+p=<-986,2686,-304>, v=<-138,378,-38>, a=<9,-26,5>
+p=<2871,-1251,358>, v=<411,-175,52>, a=<-28,17,0>
+p=<1868,319,-2475>, v=<267,45,-348>, a=<-18,-3,22>
+p=<2451,19,-1262>, v=<352,-1,-183>, a=<-25,0,12>
+p=<1585,2301,-869>, v=<231,330,-120>, a=<-10,-23,7>
+p=<2502,1759,-696>, v=<357,257,-102>, a=<-24,-19,6>
+p=<2305,537,-2463>, v=<332,77,-348>, a=<-22,-8,18>
+p=<-255,2470,-1500>, v=<-35,349,-217>, a=<6,-22,12>
+p=<-236,2477,-1290>, v=<-37,350,-184>, a=<6,-24,15>
+p=<2401,258,1682>, v=<343,36,238>, a=<-21,-2,-16>
+p=<-674,2633,130>, v=<-96,377,22>, a=<7,-32,0>
+p=<-682,-183,-2591>, v=<-95,-27,-365>, a=<6,6,22>
+p=<-153,2400,-2116>, v=<-24,340,-304>, a=<2,-25,20>
+p=<-1243,2187,1831>, v=<-177,311,261>, a=<13,-22,-18>
+p=<1115,-2968,-411>, v=<164,-423,-63>, a=<-5,31,5>
+p=<2669,-425,-1805>, v=<381,-55,-256>, a=<-26,4,19>
+p=<-1819,-1005,-1806>, v=<-259,-146,-254>, a=<13,9,22>
+p=<2727,-746,-1095>, v=<388,-107,-161>, a=<-21,7,10>
+p=<2988,-1385,-756>, v=<431,-194,-105>, a=<-31,12,9>
+p=<1892,-843,-2112>, v=<270,-120,-295>, a=<-18,8,18>
+p=<981,-1233,2354>, v=<140,-176,335>, a=<-7,11,-21>
+p=<-798,910,2557>, v=<-114,134,367>, a=<9,-9,-28>
+p=<1357,3162,599>, v=<193,457,83>, a=<-12,-31,-6>
+p=<2670,1729,-42>, v=<383,245,-2>, a=<-29,-17,2>
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+p=<-166,-236,2935>, v=<-20,-33,417>, a=<-2,0,-29>
+p=<3032,-500,391>, v=<440,-72,55>, a=<-35,10,1>
+p=<1867,1954,117>, v=<266,282,16>, a=<-11,-15,1>
+p=<165,1444,2170>, v=<20,206,312>, a=<-2,-10,-19>
+p=<-2105,-2100,395>, v=<-303,-300,51>, a=<23,21,-3>
+p=<-975,2566,-2097>, v=<-141,364,-304>, a=<5,-26,20>
+p=<2688,-678,-926>, v=<383,-97,-136>, a=<-28,6,9>
+p=<-331,-3031,-174>, v=<-43,-435,-21>, a=<4,33,4>
+p=<-1036,-2037,-1769>, v=<-149,-290,-254>, a=<8,27,17>
+p=<443,-1213,-2648>, v=<60,-173,-386>, a=<-8,14,26>
+p=<-2666,220,1758>, v=<-380,31,253>, a=<27,1,-16>
+p=<1168,2827,1304>, v=<169,403,184>, a=<-11,-27,-11>
+p=<1237,645,2828>, v=<176,89,403>, a=<-11,-3,-27>
+p=<-194,-718,2500>, v=<-26,-97,355>, a=<2,2,-25>
+p=<-1738,-1623,1459>, v=<-246,-231,207>, a=<20,18,-14>
+p=<607,-1729,-2554>, v=<87,-244,-363>, a=<-5,17,21>
+p=<-772,2981,-1709>, v=<-108,429,-248>, a=<6,-29,13>
+p=<-929,-935,2559>, v=<-131,-133,366>, a=<8,9,-27>
+p=<1889,-2222,2>, v=<273,-315,-4>, a=<-23,24,2>
+p=<2252,-1177,-1148>, v=<317,-163,-169>, a=<-22,7,14>
+p=<898,1129,1677>, v=<128,160,240>, a=<-8,-11,-18>
+p=<585,1776,-1605>, v=<86,257,-232>, a=<-3,-11,11>
+p=<1329,-702,2447>, v=<188,-99,350>, a=<-20,5,-24>
+p=<-740,-1556,-2238>, v=<-104,-219,-317>, a=<9,19,22>
+p=<1221,2376,-501>, v=<176,343,-70>, a=<-13,-23,2>
+p=<-18,-582,-2939>, v=<-1,-83,-416>, a=<0,11,31>
+p=<328,-1362,2407>, v=<47,-192,345>, a=<-1,11,-24>
+p=<2254,-795,-2176>, v=<319,-115,-306>, a=<-17,7,20>
+p=<1945,2178,374>, v=<273,308,54>, a=<-22,-23,-3>
+p=<-1255,1542,-2209>, v=<-182,220,-315>, a=<11,-15,23>
+p=<-1029,1657,2328>, v=<-148,234,331>, a=<16,-16,-27>
+p=<299,2821,-1374>, v=<44,402,-193>, a=<-7,-25,13>
+p=<-2317,106,-1824>, v=<-331,20,-262>, a=<23,-1,13>
+p=<784,-2450,-1388>, v=<116,-346,-195>, a=<-11,26,14>
+p=<2738,-544,-356>, v=<393,-77,-49>, a=<-26,10,-3>
+p=<1355,1483,2334>, v=<195,211,331>, a=<-12,-19,-17>
+p=<2570,-849,-414>, v=<369,-117,-60>, a=<-21,9,9>
+p=<313,-1203,-2974>, v=<41,-173,-422>, a=<-4,16,26>
+p=<133,-3658,193>, v=<22,-524,27>, a=<-4,42,2>
+p=<1293,-1644,2714>, v=<179,-232,383>, a=<-12,15,-33>
+p=<152,1845,1804>, v=<24,263,261>, a=<-1,-14,-18>
+p=<1059,2077,-1799>, v=<154,296,-251>, a=<-7,-19,13>
+p=<-2954,-985,167>, v=<-418,-140,23>, a=<29,7,-3>
diff --git a/2017/d21/ex1/ex1.py b/2017/d21/ex1/ex1.py
new file mode 100755
index 0000000..b5bda88
--- /dev/null
+++ b/2017/d21/ex1/ex1.py
@@ -0,0 +1,88 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections.abc import Iterator
+
+# 2x2 *and* 3x3 grid
+Grid = tuple[tuple[bool, ...], ...]
+START = ".#./..#/###"
+
+
+def solve(input: str) -> int:
+    def parse_pattern(input: str) -> Grid:
+        return tuple(tuple(c == "#" for c in line) for line in input.split("/"))
+
+    def parse(input: str) -> dict[Grid, Grid]:
+        return {
+            start: end
+            for start, end in (
+                map(parse_pattern, line.split(" => ")) for line in input.splitlines()
+            )
+        }
+
+    def permutations(grid: Grid) -> set[Grid]:
+        def iter_rotated(grid: Grid) -> Iterator[Grid]:
+            for _ in range(4):
+                yield grid
+                grid = tuple(
+                    tuple(grid[len(grid) - y - 1][x] for y in range(len(grid[0])))
+                    for x in range(len(grid))
+                )
+
+        def iter_flipped(grid: Grid) -> Iterator[Grid]:
+            yield grid
+            yield grid[::-1]
+            yield tuple(line[::-1] for line in grid)
+
+        return {
+            flip for rotated in iter_rotated(grid) for flip in iter_flipped(rotated)
+        }
+
+    def normalize_rules(raw_rules: dict[Grid, Grid]) -> dict[Grid, Grid]:
+        res: dict[Grid, Grid] = {}
+        for pattern, grid in raw_rules.items():
+            for perm in permutations(pattern):
+                res[perm] = grid
+        return res
+
+    def enhance(rules: dict[Grid, Grid], rounds: int) -> list[list[bool]]:
+        def step(grid: list[list[bool]]) -> list[list[bool]]:
+            is_even = len(grid) % 2 == 0
+            step_size = 2 if is_even else 3
+            next_size = len(grid) * (step_size + 1) // step_size
+            res = [[False for _ in range(next_size)] for _ in range(next_size)]
+
+            for x, y in itertools.product(range(len(grid) // step_size), repeat=2):
+                elem = tuple(
+                    tuple(
+                        grid[x * step_size + dx][y * step_size + dy]
+                        for dy in range(step_size)
+                    )
+                    for dx in range(step_size)
+                )
+                new_grid = rules[elem]
+                for dx, line in enumerate(new_grid):
+                    for dy, p in enumerate(line):
+                        res[x * len(new_grid) + dx][y * len(line) + dy] = p
+
+            return res
+
+        grid = [[p for p in line] for line in parse_pattern(START)]
+        for _ in range(rounds):
+            grid = step(grid)
+        return grid
+
+    raw_rules = parse(input)
+    norm_rules = normalize_rules(raw_rules)
+    art = enhance(norm_rules, 5)
+    return sum(itertools.chain.from_iterable(art))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d21/ex1/input b/2017/d21/ex1/input
new file mode 100644
index 0000000..4f409b0
--- /dev/null
+++ b/2017/d21/ex1/input
@@ -0,0 +1,108 @@
+../.. => #.#/#../...
+#./.. => #.#/#.#/.#.
+##/.. => #../.##/##.
+.#/#. => ..#/..#/..#
+##/#. => ##./.#./#..
+##/## => .../.#./.#.
+.../.../... => ..#./##.#/#.##/##.#
+#../.../... => #.##/..../##../###.
+.#./.../... => ##.#/###./#.##/#.#.
+##./.../... => ##.#/#.##/.#../##.#
+#.#/.../... => ...#/..#./.#.#/.###
+###/.../... => ..../#..#/#.##/##..
+.#./#../... => .#../.#.#/..#./.###
+##./#../... => ..##/#.##/#.../#.#.
+..#/#../... => .##./#.##/.#../##..
+#.#/#../... => #.../.##./...#/###.
+.##/#../... => #.##/..##/.#.#/##..
+###/#../... => #..#/...#/..#./...#
+.../.#./... => .###/.#../..#./####
+#../.#./... => ####/#.../.###/##..
+.#./.#./... => ####/#..#/####/#..#
+##./.#./... => .#../..##/..##/#..#
+#.#/.#./... => .#.#/#.##/#.#./.#.#
+###/.#./... => #.##/#.../###./#..#
+.#./##./... => ###./#.../..../.###
+##./##./... => #.##/###./...#/###.
+..#/##./... => .#.#/###./..#./#...
+#.#/##./... => #.#./##../##../..##
+.##/##./... => ..../..#./.##./.#.#
+###/##./... => #.../.#../#.#./#..#
+.../#.#/... => ##../#.##/.##./.##.
+#../#.#/... => #.#./##.#/.###/.###
+.#./#.#/... => ..../####/####/.#.#
+##./#.#/... => #.##/.###/##../#...
+#.#/#.#/... => ###./..##/#.#./####
+###/#.#/... => .##./..../###./....
+.../###/... => ###./.##./##../.###
+#../###/... => .#../#.../###./...#
+.#./###/... => #.#./#.#./####/###.
+##./###/... => ...#/##../###./#.#.
+#.#/###/... => .#.#/#.#./..#./.##.
+###/###/... => ..../#.##/...#/##..
+..#/.../#.. => ...#/#.##/#..#/..##
+#.#/.../#.. => ..#./##.#/.#.#/..##
+.##/.../#.. => ..##/##../#.#./#.##
+###/.../#.. => #.##/###./...#/.##.
+.##/#../#.. => ##../#.##/##.#/##..
+###/#../#.. => #.##/##../.##./.#.#
+..#/.#./#.. => #..#/##../.###/#.#.
+#.#/.#./#.. => .###/#.##/#.#./####
+.##/.#./#.. => #.#./#.../#.##/...#
+###/.#./#.. => .##./.#.#/#.#./.#.#
+.##/##./#.. => .###/.#.#/...#/#.#.
+###/##./#.. => .###/#.##/#.##/#.#.
+#../..#/#.. => #.../##../.##./###.
+.#./..#/#.. => #.../#.##/#.../###.
+##./..#/#.. => ####/..../##.#/.###
+#.#/..#/#.. => ..##/##.#/#.##/#..#
+.##/..#/#.. => ..#./##.#/#.#./..##
+###/..#/#.. => ..##/...#/#..#/#..#
+#../#.#/#.. => #.../..../#.../#.##
+.#./#.#/#.. => ##../####/.#.#/##..
+##./#.#/#.. => .#../..../#.../.##.
+..#/#.#/#.. => .#../.#.#/.#.#/..#.
+#.#/#.#/#.. => ..#./#.##/#.#./..##
+.##/#.#/#.. => #.##/..##/...#/####
+###/#.#/#.. => .##./.#.#/###./#..#
+#../.##/#.. => ..##/.###/.#../##.#
+.#./.##/#.. => #.##/.##./.##./.###
+##./.##/#.. => .##./.#../..../..##
+#.#/.##/#.. => ..../#.#./##.#/###.
+.##/.##/#.. => #..#/..../##.#/..#.
+###/.##/#.. => ####/##.#/#..#/##..
+#../###/#.. => #.#./###./.###/#...
+.#./###/#.. => ##.#/#..#/#.##/..#.
+##./###/#.. => ..#./...#/..##/...#
+..#/###/#.. => .#.#/..../..##/..##
+#.#/###/#.. => #..#/..#./.#../..#.
+.##/###/#.. => .#.#/..../#..#/...#
+###/###/#.. => #.##/##../.#../....
+.#./#.#/.#. => ..../####/.###/.#.#
+##./#.#/.#. => #.##/...#/####/####
+#.#/#.#/.#. => ..#./##../..../#...
+###/#.#/.#. => ####/#.##/###./...#
+.#./###/.#. => ...#/..#./...#/..#.
+##./###/.#. => .##./#.../.#.#/.###
+#.#/###/.#. => ..../..../.#.#/#.##
+###/###/.#. => ..#./###./##.#/....
+#.#/..#/##. => .###/.#../..#./####
+###/..#/##. => #.##/..#./#..#/....
+.##/#.#/##. => #.../##../####/.##.
+###/#.#/##. => ###./..#./..#./##..
+#.#/.##/##. => #.../##../##.#/#.##
+###/.##/##. => ..#./#..#/#.##/####
+.##/###/##. => .#.#/.###/...#/.#..
+###/###/##. => ####/..../.#.#/...#
+#.#/.../#.# => ##.#/#..#/.##./...#
+###/.../#.# => #.#./.#../...#/...#
+###/#../#.# => .#.#/.#../##../##..
+#.#/.#./#.# => ###./#.../####/.#.#
+###/.#./#.# => ##../#.#./..##/##.#
+###/##./#.# => ####/..../###./.##.
+#.#/#.#/#.# => ...#/.##./##../.###
+###/#.#/#.# => ..#./.##./##.#/.#..
+#.#/###/#.# => ...#/..../..#./...#
+###/###/#.# => #.#./#.#./##../....
+###/#.#/### => #.../##.#/.#../..#.
+###/###/### => ##../..#./##../..#.
diff --git a/2017/d21/ex2/ex2.py b/2017/d21/ex2/ex2.py
new file mode 100755
index 0000000..321a032
--- /dev/null
+++ b/2017/d21/ex2/ex2.py
@@ -0,0 +1,88 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections.abc import Iterator
+
+# 2x2 *and* 3x3 grid
+Grid = tuple[tuple[bool, ...], ...]
+START = ".#./..#/###"
+
+
+def solve(input: str) -> int:
+    def parse_pattern(input: str) -> Grid:
+        return tuple(tuple(c == "#" for c in line) for line in input.split("/"))
+
+    def parse(input: str) -> dict[Grid, Grid]:
+        return {
+            start: end
+            for start, end in (
+                map(parse_pattern, line.split(" => ")) for line in input.splitlines()
+            )
+        }
+
+    def permutations(grid: Grid) -> set[Grid]:
+        def iter_rotated(grid: Grid) -> Iterator[Grid]:
+            for _ in range(4):
+                yield grid
+                grid = tuple(
+                    tuple(grid[len(grid) - y - 1][x] for y in range(len(grid[0])))
+                    for x in range(len(grid))
+                )
+
+        def iter_flipped(grid: Grid) -> Iterator[Grid]:
+            yield grid
+            yield grid[::-1]
+            yield tuple(line[::-1] for line in grid)
+
+        return {
+            flip for rotated in iter_rotated(grid) for flip in iter_flipped(rotated)
+        }
+
+    def normalize_rules(raw_rules: dict[Grid, Grid]) -> dict[Grid, Grid]:
+        res: dict[Grid, Grid] = {}
+        for pattern, grid in raw_rules.items():
+            for perm in permutations(pattern):
+                res[perm] = grid
+        return res
+
+    def enhance(rules: dict[Grid, Grid], rounds: int) -> list[list[bool]]:
+        def step(grid: list[list[bool]]) -> list[list[bool]]:
+            is_even = len(grid) % 2 == 0
+            step_size = 2 if is_even else 3
+            next_size = len(grid) * (step_size + 1) // step_size
+            res = [[False for _ in range(next_size)] for _ in range(next_size)]
+
+            for x, y in itertools.product(range(len(grid) // step_size), repeat=2):
+                elem = tuple(
+                    tuple(
+                        grid[x * step_size + dx][y * step_size + dy]
+                        for dy in range(step_size)
+                    )
+                    for dx in range(step_size)
+                )
+                new_grid = rules[elem]
+                for dx, line in enumerate(new_grid):
+                    for dy, p in enumerate(line):
+                        res[x * len(new_grid) + dx][y * len(line) + dy] = p
+
+            return res
+
+        grid = [[p for p in line] for line in parse_pattern(START)]
+        for _ in range(rounds):
+            grid = step(grid)
+        return grid
+
+    raw_rules = parse(input)
+    norm_rules = normalize_rules(raw_rules)
+    art = enhance(norm_rules, 18)
+    return sum(itertools.chain.from_iterable(art))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d21/ex2/input b/2017/d21/ex2/input
new file mode 100644
index 0000000..4f409b0
--- /dev/null
+++ b/2017/d21/ex2/input
@@ -0,0 +1,108 @@
+../.. => #.#/#../...
+#./.. => #.#/#.#/.#.
+##/.. => #../.##/##.
+.#/#. => ..#/..#/..#
+##/#. => ##./.#./#..
+##/## => .../.#./.#.
+.../.../... => ..#./##.#/#.##/##.#
+#../.../... => #.##/..../##../###.
+.#./.../... => ##.#/###./#.##/#.#.
+##./.../... => ##.#/#.##/.#../##.#
+#.#/.../... => ...#/..#./.#.#/.###
+###/.../... => ..../#..#/#.##/##..
+.#./#../... => .#../.#.#/..#./.###
+##./#../... => ..##/#.##/#.../#.#.
+..#/#../... => .##./#.##/.#../##..
+#.#/#../... => #.../.##./...#/###.
+.##/#../... => #.##/..##/.#.#/##..
+###/#../... => #..#/...#/..#./...#
+.../.#./... => .###/.#../..#./####
+#../.#./... => ####/#.../.###/##..
+.#./.#./... => ####/#..#/####/#..#
+##./.#./... => .#../..##/..##/#..#
+#.#/.#./... => .#.#/#.##/#.#./.#.#
+###/.#./... => #.##/#.../###./#..#
+.#./##./... => ###./#.../..../.###
+##./##./... => #.##/###./...#/###.
+..#/##./... => .#.#/###./..#./#...
+#.#/##./... => #.#./##../##../..##
+.##/##./... => ..../..#./.##./.#.#
+###/##./... => #.../.#../#.#./#..#
+.../#.#/... => ##../#.##/.##./.##.
+#../#.#/... => #.#./##.#/.###/.###
+.#./#.#/... => ..../####/####/.#.#
+##./#.#/... => #.##/.###/##../#...
+#.#/#.#/... => ###./..##/#.#./####
+###/#.#/... => .##./..../###./....
+.../###/... => ###./.##./##../.###
+#../###/... => .#../#.../###./...#
+.#./###/... => #.#./#.#./####/###.
+##./###/... => ...#/##../###./#.#.
+#.#/###/... => .#.#/#.#./..#./.##.
+###/###/... => ..../#.##/...#/##..
+..#/.../#.. => ...#/#.##/#..#/..##
+#.#/.../#.. => ..#./##.#/.#.#/..##
+.##/.../#.. => ..##/##../#.#./#.##
+###/.../#.. => #.##/###./...#/.##.
+.##/#../#.. => ##../#.##/##.#/##..
+###/#../#.. => #.##/##../.##./.#.#
+..#/.#./#.. => #..#/##../.###/#.#.
+#.#/.#./#.. => .###/#.##/#.#./####
+.##/.#./#.. => #.#./#.../#.##/...#
+###/.#./#.. => .##./.#.#/#.#./.#.#
+.##/##./#.. => .###/.#.#/...#/#.#.
+###/##./#.. => .###/#.##/#.##/#.#.
+#../..#/#.. => #.../##../.##./###.
+.#./..#/#.. => #.../#.##/#.../###.
+##./..#/#.. => ####/..../##.#/.###
+#.#/..#/#.. => ..##/##.#/#.##/#..#
+.##/..#/#.. => ..#./##.#/#.#./..##
+###/..#/#.. => ..##/...#/#..#/#..#
+#../#.#/#.. => #.../..../#.../#.##
+.#./#.#/#.. => ##../####/.#.#/##..
+##./#.#/#.. => .#../..../#.../.##.
+..#/#.#/#.. => .#../.#.#/.#.#/..#.
+#.#/#.#/#.. => ..#./#.##/#.#./..##
+.##/#.#/#.. => #.##/..##/...#/####
+###/#.#/#.. => .##./.#.#/###./#..#
+#../.##/#.. => ..##/.###/.#../##.#
+.#./.##/#.. => #.##/.##./.##./.###
+##./.##/#.. => .##./.#../..../..##
+#.#/.##/#.. => ..../#.#./##.#/###.
+.##/.##/#.. => #..#/..../##.#/..#.
+###/.##/#.. => ####/##.#/#..#/##..
+#../###/#.. => #.#./###./.###/#...
+.#./###/#.. => ##.#/#..#/#.##/..#.
+##./###/#.. => ..#./...#/..##/...#
+..#/###/#.. => .#.#/..../..##/..##
+#.#/###/#.. => #..#/..#./.#../..#.
+.##/###/#.. => .#.#/..../#..#/...#
+###/###/#.. => #.##/##../.#../....
+.#./#.#/.#. => ..../####/.###/.#.#
+##./#.#/.#. => #.##/...#/####/####
+#.#/#.#/.#. => ..#./##../..../#...
+###/#.#/.#. => ####/#.##/###./...#
+.#./###/.#. => ...#/..#./...#/..#.
+##./###/.#. => .##./#.../.#.#/.###
+#.#/###/.#. => ..../..../.#.#/#.##
+###/###/.#. => ..#./###./##.#/....
+#.#/..#/##. => .###/.#../..#./####
+###/..#/##. => #.##/..#./#..#/....
+.##/#.#/##. => #.../##../####/.##.
+###/#.#/##. => ###./..#./..#./##..
+#.#/.##/##. => #.../##../##.#/#.##
+###/.##/##. => ..#./#..#/#.##/####
+.##/###/##. => .#.#/.###/...#/.#..
+###/###/##. => ####/..../.#.#/...#
+#.#/.../#.# => ##.#/#..#/.##./...#
+###/.../#.# => #.#./.#../...#/...#
+###/#../#.# => .#.#/.#../##../##..
+#.#/.#./#.# => ###./#.../####/.#.#
+###/.#./#.# => ##../#.#./..##/##.#
+###/##./#.# => ####/..../###./.##.
+#.#/#.#/#.# => ...#/.##./##../.###
+###/#.#/#.# => ..#./.##./##.#/.#..
+#.#/###/#.# => ...#/..../..#./...#
+###/###/#.# => #.#./#.#./##../....
+###/#.#/### => #.../##.#/.#../..#.
+###/###/### => ##../..#./##../..#.
diff --git a/2017/d22/ex1/ex1.py b/2017/d22/ex1/ex1.py
new file mode 100755
index 0000000..3aab299
--- /dev/null
+++ b/2017/d22/ex1/ex1.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python
+
+import dataclasses
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.Enum):
+    UP = Point(-1, 0)
+    DOWN = Point(1, 0)
+    LEFT = Point(0, -1)
+    RIGHT = Point(0, 1)
+
+    def left(self) -> "Direction":
+        x, y = self.value
+        return Direction(Point(-y, x))
+
+    def right(self) -> "Direction":
+        x, y = self.value
+        return Direction(Point(y, -x))
+
+    def apply(self, p: Point) -> Point:
+        dx, dy = self.value
+        return Point(p.x + dx, p.y + dy)
+
+
+@dataclasses.dataclass
+class Carrier:
+    pos: Point
+    dir: Direction
+
+    def burst(self, infected: set[Point]) -> bool:
+        infect = False
+        if self.pos in infected:
+            self.dir = self.dir.right()
+            infected.remove(self.pos)
+        else:
+            self.dir = self.dir.left()
+            infected.add(self.pos)
+            infect = True
+        self.pos = self.dir.apply(self.pos)
+        return infect
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> set[Point]:
+        return {
+            Point(x, y)
+            for x, line in enumerate(input.splitlines())
+            for y, c in enumerate(line)
+            if c == "#"
+        }
+
+    infected = parse(input)
+    middle = len(input.splitlines()) // 2
+    carrier = Carrier(Point(middle, middle), Direction.UP)
+    total = 0
+
+    for _ in range(10000):
+        total += carrier.burst(infected)
+    return total
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d22/ex1/input b/2017/d22/ex1/input
new file mode 100644
index 0000000..216f837
--- /dev/null
+++ b/2017/d22/ex1/input
@@ -0,0 +1,25 @@
+#..#...#.#.#..#.#...##.##
+.....##.#....#.#......#.#
+..#.###.#.#######.###.#.#
+.......#.##.###.###..##.#
+#....#...#.###....##.....
+#.....##.#########..#.#.#
+.####.##..#...###.##...#.
+#....#..#.###.##.#..##.#.
+#####.#.#..#.##..#...####
+##.#.#..#.#....###.######
+.##.#...#...##.#.##..####
+...#..##.#.....#.#..####.
+#.##.###..#######.#..#.#.
+##....##....##.#..#.##..#
+##.#.#.#.##...##.....#...
+.#####..#.#....#.#######.
+####....###.###.#.#..#..#
+.###...#.###..#..#.#####.
+#.###..#.#######.#.#####.
+.##.#.###.##.##.#.#...#..
+######.###.#.#.##.####..#
+##..####.##..##.#...##...
+...##.##...#..#..##.####.
+#.....##.##.#..##.##....#
+#.#..####.....#....#.###.
diff --git a/2017/d22/ex2/ex2.py b/2017/d22/ex2/ex2.py
new file mode 100755
index 0000000..b4e6a62
--- /dev/null
+++ b/2017/d22/ex2/ex2.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+
+import collections
+import dataclasses
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.Enum):
+    UP = Point(-1, 0)
+    DOWN = Point(1, 0)
+    LEFT = Point(0, -1)
+    RIGHT = Point(0, 1)
+
+    def left(self) -> "Direction":
+        x, y = self.value
+        return Direction(Point(-y, x))
+
+    def right(self) -> "Direction":
+        x, y = self.value
+        return Direction(Point(y, -x))
+
+    def flip(self) -> "Direction":
+        x, y = self.value
+        return Direction(Point(-x, -y))
+
+    def apply(self, p: Point) -> Point:
+        dx, dy = self.value
+        return Point(p.x + dx, p.y + dy)
+
+
+class State(enum.StrEnum):
+    CLEAN = "."
+    WEAKENED = "W"
+    FLAGGED = "F"
+    INFECTED = "#"
+
+
+@dataclasses.dataclass
+class Carrier:
+    pos: Point
+    dir: Direction
+
+    def burst(self, infected: dict[Point, State]) -> bool:
+        infect = False
+        match infected[self.pos]:
+            case State.CLEAN:
+                self.dir = self.dir.left()
+                infected[self.pos] = State.WEAKENED
+            case State.WEAKENED:
+                infected[self.pos] = State.INFECTED
+                infect = True
+            case State.FLAGGED:
+                self.dir = self.dir.flip()
+                infected[self.pos] = State.CLEAN
+            case State.INFECTED:
+                self.dir = self.dir.right()
+                infected[self.pos] = State.FLAGGED
+        self.pos = self.dir.apply(self.pos)
+        return infect
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> set[Point]:
+        return {
+            Point(x, y)
+            for x, line in enumerate(input.splitlines())
+            for y, c in enumerate(line)
+            if c == "#"
+        }
+
+    infected: dict[Point, State] = collections.defaultdict(lambda: State.CLEAN)
+    for p in parse(input):
+        infected[p] = State.INFECTED
+    middle = len(input.splitlines()) // 2
+    carrier = Carrier(Point(middle, middle), Direction.UP)
+    total = 0
+
+    for _ in range(10000000):
+        total += carrier.burst(infected)
+    return total
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d22/ex2/input b/2017/d22/ex2/input
new file mode 100644
index 0000000..216f837
--- /dev/null
+++ b/2017/d22/ex2/input
@@ -0,0 +1,25 @@
+#..#...#.#.#..#.#...##.##
+.....##.#....#.#......#.#
+..#.###.#.#######.###.#.#
+.......#.##.###.###..##.#
+#....#...#.###....##.....
+#.....##.#########..#.#.#
+.####.##..#...###.##...#.
+#....#..#.###.##.#..##.#.
+#####.#.#..#.##..#...####
+##.#.#..#.#....###.######
+.##.#...#...##.#.##..####
+...#..##.#.....#.#..####.
+#.##.###..#######.#..#.#.
+##....##....##.#..#.##..#
+##.#.#.#.##...##.....#...
+.#####..#.#....#.#######.
+####....###.###.#.#..#..#
+.###...#.###..#..#.#####.
+#.###..#.#######.#.#####.
+.##.#.###.##.##.#.#...#..
+######.###.#.#.##.####..#
+##..####.##..##.#...##...
+...##.##...#..#..##.####.
+#.....##.##.#..##.##....#
+#.#..####.....#....#.###.
diff --git a/2017/d23/ex1/ex1.py b/2017/d23/ex1/ex1.py
new file mode 100755
index 0000000..1e87b46
--- /dev/null
+++ b/2017/d23/ex1/ex1.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Op(enum.StrEnum):
+    SET = "set"
+    SUB = "sub"
+    MUL = "mul"
+    JNZ = "jnz"
+
+
+class Instruction(NamedTuple):
+    op: Op
+    x: str
+    y: str
+
+    @classmethod
+    def from_str(cls, input: str) -> "Instruction":
+        op, *rest = input.split()
+        return cls(Op(op), *rest)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Instruction]:
+        return [Instruction.from_str(line) for line in input.splitlines()]
+
+    def resolve(y: str | None, registers: dict[str, int]) -> int:
+        assert y is not None  # Sanity check
+        try:
+            return int(y)
+        except ValueError:
+            return registers[y]
+
+    instructions = parse(input)
+    registers = {chr(ord("a") + i): 0 for i in range(8)}
+
+    ip = 0
+    total_muls = 0
+    while True:
+        if ip < 0 or ip >= len(instructions):
+            break
+        instr = instructions[ip]
+        ip += 1
+        match instr.op:
+            case Op.SET:
+                registers[instr.x] = resolve(instr.y, registers)
+            case Op.SUB:
+                registers[instr.x] -= resolve(instr.y, registers)
+            case Op.MUL:
+                registers[instr.x] *= resolve(instr.y, registers)
+                total_muls += 1
+            case Op.JNZ:
+                if resolve(instr.x, registers) != 0:
+                    ip += resolve(instr.y, registers) - 1  # Account auto-increment
+    return total_muls
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d23/ex1/input b/2017/d23/ex1/input
new file mode 100644
index 0000000..30fb446
--- /dev/null
+++ b/2017/d23/ex1/input
@@ -0,0 +1,32 @@
+set b 81
+set c b
+jnz a 2
+jnz 1 5
+mul b 100
+sub b -100000
+set c b
+sub c -17000
+set f 1
+set d 2
+set e 2
+set g d
+mul g e
+sub g b
+jnz g 2
+set f 0
+sub e -1
+set g e
+sub g b
+jnz g -8
+sub d -1
+set g d
+sub g b
+jnz g -13
+jnz f 2
+sub h -1
+set g b
+sub g c
+jnz g 2
+jnz 1 3
+sub b -17
+jnz 1 -23
diff --git a/2017/d23/ex2/ex2.py b/2017/d23/ex2/ex2.py
new file mode 100755
index 0000000..cf18a89
--- /dev/null
+++ b/2017/d23/ex2/ex2.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+import enum
+import math
+import sys
+from typing import NamedTuple
+
+
+class Op(enum.StrEnum):
+    SET = "set"
+    SUB = "sub"
+    MUL = "mul"
+    JNZ = "jnz"
+
+
+class Instruction(NamedTuple):
+    op: Op
+    x: str
+    y: str
+
+    @classmethod
+    def from_str(cls, input: str) -> "Instruction":
+        op, *rest = input.split()
+        return cls(Op(op), *rest)
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Instruction]:
+        return [Instruction.from_str(line) for line in input.splitlines()]
+
+    def is_prime(n: int) -> bool:
+        if n % 2 == 0:
+            return False
+        for i in range(3, math.isqrt(n), 2):
+            if n % i == 0:
+                return False
+        return True
+
+    instructions = parse(input)
+    start = int(instructions[0].y) * 100 + 100000
+    end = start + 17000
+
+    total = 0
+    for n in range(start, end + 1, 17):
+        total += not is_prime(n)
+    return total
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d23/ex2/input b/2017/d23/ex2/input
new file mode 100644
index 0000000..30fb446
--- /dev/null
+++ b/2017/d23/ex2/input
@@ -0,0 +1,32 @@
+set b 81
+set c b
+jnz a 2
+jnz 1 5
+mul b 100
+sub b -100000
+set c b
+sub c -17000
+set f 1
+set d 2
+set e 2
+set g d
+mul g e
+sub g b
+jnz g 2
+set f 0
+sub e -1
+set g e
+sub g b
+jnz g -8
+sub d -1
+set g d
+sub g b
+jnz g -13
+jnz f 2
+sub h -1
+set g b
+sub g c
+jnz g 2
+jnz 1 3
+sub b -17
+jnz 1 -23
diff --git a/2017/d24/ex1/ex1.py b/2017/d24/ex1/ex1.py
new file mode 100755
index 0000000..82509fc
--- /dev/null
+++ b/2017/d24/ex1/ex1.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+
+import functools
+import sys
+from typing import NamedTuple
+
+
+class Component(NamedTuple):
+    left: int
+    right: int
+
+    @classmethod
+    def from_str(cls, input: str) -> "Component":
+        return cls(*map(int, input.split("/")))
+
+    def remaining_port(self, connection: int) -> int:
+        if connection == self.left:
+            return self.right
+        elif connection == self.right:
+            return self.left
+        assert False  # Sanity check
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Component]:
+        return [Component.from_str(line) for line in input.splitlines()]
+
+    @functools.cache
+    def strongest_bridge(start: int, components: frozenset[Component]) -> int:
+        candidates = {c for c in components if start in c}
+        if not candidates:
+            return 0
+        return max(
+            sum(c) + strongest_bridge(c.remaining_port(start), components - {c})
+            for c in candidates
+        )
+
+    components = parse(input)
+    assert len(set(components)) == len(components)  # Sanity check
+    return strongest_bridge(0, frozenset(components))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d24/ex1/input b/2017/d24/ex1/input
new file mode 100644
index 0000000..383dcb0
--- /dev/null
+++ b/2017/d24/ex1/input
@@ -0,0 +1,57 @@
+25/13
+4/43
+42/42
+39/40
+17/18
+30/7
+12/12
+32/28
+9/28
+1/1
+16/7
+47/43
+34/16
+39/36
+6/4
+3/2
+10/49
+46/50
+18/25
+2/23
+3/21
+5/24
+46/26
+50/19
+26/41
+1/50
+47/41
+39/50
+12/14
+11/19
+28/2
+38/47
+5/5
+38/34
+39/39
+17/34
+42/16
+32/23
+13/21
+28/6
+6/20
+1/30
+44/21
+11/28
+14/17
+33/33
+17/43
+31/13
+11/21
+31/39
+0/9
+13/50
+10/14
+16/10
+3/24
+7/0
+50/50
diff --git a/2017/d24/ex2/ex2.py b/2017/d24/ex2/ex2.py
new file mode 100755
index 0000000..28540eb
--- /dev/null
+++ b/2017/d24/ex2/ex2.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Component(NamedTuple):
+    left: int
+    right: int
+
+    @classmethod
+    def from_str(cls, input: str) -> "Component":
+        return cls(*map(int, input.split("/")))
+
+    def remaining_port(self, connection: int) -> int:
+        if connection == self.left:
+            return self.right
+        elif connection == self.right:
+            return self.left
+        assert False  # Sanity check
+
+
+class Bridge(NamedTuple):
+    components: tuple[Component, ...]
+    head: int
+
+    @property
+    def length(self):
+        return len(self.components)
+
+    @property
+    def strength(self):
+        return sum(itertools.chain.from_iterable(self.components))
+
+    def add(self, c: Component) -> "Bridge":
+        assert self.head in c  # Sanity check
+        return Bridge(self.components + (c,), c.remaining_port(self.head))
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[Component]:
+        return [Component.from_str(line) for line in input.splitlines()]
+
+    def longest_bridge(components: set[Component]) -> Bridge:
+        def build_bridges(
+            bridge: Bridge, components: set[Component]
+        ) -> Iterator[Bridge]:
+            candidates = {c for c in components if bridge.head in c}
+            if not candidates:
+                yield bridge
+                return
+            for c in candidates:
+                yield from build_bridges(bridge.add(c), components - {c})
+
+        return max(
+            build_bridges(Bridge((), 0), components),
+            key=lambda b: (b.length, b.strength),
+        )
+
+    components = parse(input)
+    assert len(set(components)) == len(components)  # Sanity check
+    bridge = longest_bridge(set(components))
+    return bridge.strength
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d24/ex2/input b/2017/d24/ex2/input
new file mode 100644
index 0000000..383dcb0
--- /dev/null
+++ b/2017/d24/ex2/input
@@ -0,0 +1,57 @@
+25/13
+4/43
+42/42
+39/40
+17/18
+30/7
+12/12
+32/28
+9/28
+1/1
+16/7
+47/43
+34/16
+39/36
+6/4
+3/2
+10/49
+46/50
+18/25
+2/23
+3/21
+5/24
+46/26
+50/19
+26/41
+1/50
+47/41
+39/50
+12/14
+11/19
+28/2
+38/47
+5/5
+38/34
+39/39
+17/34
+42/16
+32/23
+13/21
+28/6
+6/20
+1/30
+44/21
+11/28
+14/17
+33/33
+17/43
+31/13
+11/21
+31/39
+0/9
+13/50
+10/14
+16/10
+3/24
+7/0
+50/50
diff --git a/2017/d25/ex1/ex1.py b/2017/d25/ex1/ex1.py
new file mode 100755
index 0000000..b57dc3f
--- /dev/null
+++ b/2017/d25/ex1/ex1.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+import collections
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Direction(enum.StrEnum):
+    LEFT = "left"
+    RIGHT = "right"
+
+    def apply(self, pos: int) -> int:
+        return pos + 1 if self == Direction.RIGHT else pos - 1
+
+
+class Rules(NamedTuple):
+    zero_write: bool
+    zero_dir: Direction
+    zero_transition: str
+
+    one_write: bool
+    one_dir: Direction
+    one_transition: str
+
+    @classmethod
+    def from_str(cls, input: str) -> "Rules":
+        lines = input.splitlines()
+        return cls(
+            zero_write=bool(int(lines[1][-2])),
+            zero_dir=Direction(lines[2][:-1].split()[-1]),
+            zero_transition=lines[3][-2],
+            one_write=bool(int(lines[5][-2])),
+            one_dir=Direction(lines[6][:-1].split()[-1]),
+            one_transition=lines[7][-2],
+        )
+
+    def apply(self, tape: dict[int, bool], pos: int) -> tuple[str, int]:
+        if tape[pos]:
+            tape[pos] = self.one_write
+            return self.one_transition, self.one_dir.apply(pos)
+        else:
+            tape[pos] = self.zero_write
+            return self.zero_transition, self.zero_dir.apply(pos)
+
+
+def solve(input: str) -> int:
+    def parse_rules(input: str) -> tuple[str, Rules]:
+        assert input.startswith("In state ")  # Sanity check
+        state, lines = input.split("\n", 1)
+        return state[-2], Rules.from_str(lines)
+
+    def parse(input: str) -> tuple[str, int, dict[str, Rules]]:
+        first, *rest = input.split("\n\n")
+        raw_state, raw_checksum = first.splitlines()
+        rules = {state: rules for state, rules in map(parse_rules, rest)}
+        return raw_state[-2], int(raw_checksum.split()[-2]), rules
+
+    state, iterations, rules = parse(input)
+    pos = 0
+    tape: dict[int, bool] = collections.defaultdict(bool)
+    for _ in range(iterations):
+        state, pos = rules[state].apply(tape, pos)
+    return sum(tape.values())
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d25/ex1/input b/2017/d25/ex1/input
new file mode 100644
index 0000000..199164f
--- /dev/null
+++ b/2017/d25/ex1/input
@@ -0,0 +1,62 @@
+Begin in state A.
+Perform a diagnostic checksum after 12683008 steps.
+
+In state A:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state B.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state B.
+
+In state B:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state C.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state E.
+
+In state C:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state D.
+
+In state D:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+
+In state E:
+  If the current value is 0:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state F.
+
+In state F:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state A.
diff --git a/2017/d25/ex2/ex2.py b/2017/d25/ex2/ex2.py
new file mode 100755
index 0000000..918e0ec
--- /dev/null
+++ b/2017/d25/ex2/ex2.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python
+
+
+def main() -> None:
+    print("There is no part two...")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2017/d25/ex2/input b/2017/d25/ex2/input
new file mode 100644
index 0000000..199164f
--- /dev/null
+++ b/2017/d25/ex2/input
@@ -0,0 +1,62 @@
+Begin in state A.
+Perform a diagnostic checksum after 12683008 steps.
+
+In state A:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state B.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state B.
+
+In state B:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state C.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state E.
+
+In state C:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the left.
+    - Continue with state D.
+
+In state D:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the left.
+    - Continue with state A.
+
+In state E:
+  If the current value is 0:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state A.
+  If the current value is 1:
+    - Write the value 0.
+    - Move one slot to the right.
+    - Continue with state F.
+
+In state F:
+  If the current value is 0:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state E.
+  If the current value is 1:
+    - Write the value 1.
+    - Move one slot to the right.
+    - Continue with state A.