diff --git a/2021/d02/ex1/ex1.py b/2021/d02/ex1/ex1.py
new file mode 100755
index 0000000..61c98d6
--- /dev/null
+++ b/2021/d02/ex1/ex1.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List
+
+
+def solve(input: List[str]) -> int:
+    x, y = 0, 0
+
+    for instruction in input:
+        dir, length = instruction.split(" ")
+        length = int(length)
+        if dir == "forward":
+            x += length
+        elif dir == "down":
+            y += length
+        elif dir == "up":
+            y -= length
+        else:
+            assert False
+
+    return x * y
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d02/ex1/input b/2021/d02/ex1/input
new file mode 100644
index 0000000..2652d35
--- /dev/null
+++ b/2021/d02/ex1/input
@@ -0,0 +1,1000 @@
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diff --git a/2021/d02/ex2/ex2.py b/2021/d02/ex2/ex2.py
new file mode 100755
index 0000000..a5a5f3d
--- /dev/null
+++ b/2021/d02/ex2/ex2.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List
+
+
+def solve(input: List[str]) -> int:
+    x, y, aim = 0, 0, 0
+
+    for instruction in input:
+        dir, length = instruction.split(" ")
+        length = int(length)
+        if dir == "forward":
+            x += length
+            y += length * aim
+        elif dir == "down":
+            aim += length
+        elif dir == "up":
+            aim -= length
+        else:
+            assert False
+
+    return x * y
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d02/ex2/input b/2021/d02/ex2/input
new file mode 100644
index 0000000..2652d35
--- /dev/null
+++ b/2021/d02/ex2/input
@@ -0,0 +1,1000 @@
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diff --git a/2021/d03/ex1/ex1.py b/2021/d03/ex1/ex1.py
new file mode 100755
index 0000000..ed2eeb7
--- /dev/null
+++ b/2021/d03/ex1/ex1.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List
+
+
+def solve(input: List[int]) -> int:
+    gamma, epsilon = 0, 0
+    bit = 1
+
+    while any(map(bool, input)):
+        num_bits = sum(n % 2 for n in input)
+        if num_bits >= len(input) / 2:
+            gamma += bit
+        else:
+            epsilon += bit
+        input = [n // 2 for n in input]
+        bit *= 2
+
+    return gamma * epsilon
+
+
+def main() -> None:
+    input = [int(line, 2) for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d03/ex1/input b/2021/d03/ex1/input
new file mode 100644
index 0000000..929c455
--- /dev/null
+++ b/2021/d03/ex1/input
@@ -0,0 +1,1000 @@
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diff --git a/2021/d03/ex2/ex2.py b/2021/d03/ex2/ex2.py
new file mode 100755
index 0000000..9c6515b
--- /dev/null
+++ b/2021/d03/ex2/ex2.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from copy import deepcopy
+from typing import List
+
+
+def solve(input: List[int]) -> int:
+    def highest_pow2(n: int) -> int:
+        return len(bin(n)) - 2 - 1  # '0b' prefix, and off-by-one
+
+    def count_bits_at(input: List[int], bit: int) -> int:
+        return sum((n & pow(2, bit)) != 0 for n in input)
+
+    def filter_by_bit_value(input: List[int], bit: int, value: int) -> List[int]:
+        # Simplify the filter by mapping the value to the actual power of 2
+        if value != 0:
+            value = pow(2, bit)
+        return list(filter(lambda n: (n & pow(2, bit)) == value, input))
+
+    def filter_oxygen(input: List[int], bit: int) -> List[int]:
+        # No further processing needed
+        if len(input) <= 1:
+            return input
+
+        num_bits = count_bits_at(input, bit)
+        # Keep 1s on equality
+        if num_bits >= len(input) / 2:
+            return filter_by_bit_value(input, bit, 1)
+        else:
+            return filter_by_bit_value(input, bit, 0)
+
+    def filter_co2(input: List[int], bit: int) -> List[int]:
+        # No further processing needed
+        if len(input) <= 1:
+            return input
+
+        num_bits = count_bits_at(input, bit)
+        # Keep 0s on equality
+        if num_bits < len(input) / 2:
+            return filter_by_bit_value(input, bit, 1)
+        else:
+            return filter_by_bit_value(input, bit, 0)
+
+    oxygen, co2 = 0, 0
+    max_bit = max(highest_pow2(n) for n in input)
+    oxygen_input, co2_input = deepcopy(input), deepcopy(input)
+
+    for bit in range(max_bit, -1, -1):
+        oxygen_input = filter_oxygen(oxygen_input, bit)
+        co2_input = filter_co2(co2_input, bit)
+
+        if len(oxygen_input) == 1:
+            oxygen = oxygen_input[0]
+        if len(co2_input) == 1:
+            co2 = co2_input[0]
+
+    return oxygen * co2
+
+
+def main() -> None:
+    input = [int(line, 2) for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d03/ex2/input b/2021/d03/ex2/input
new file mode 100644
index 0000000..929c455
--- /dev/null
+++ b/2021/d03/ex2/input
@@ -0,0 +1,1000 @@
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diff --git a/2021/d04/ex1/ex1.py b/2021/d04/ex1/ex1.py
new file mode 100755
index 0000000..9cfc0c2
--- /dev/null
+++ b/2021/d04/ex1/ex1.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List, Tuple
+
+Board = List[List[int]]
+
+
+def solve(input: List[str]) -> int:
+    def parse_input() -> Tuple[List[int], List[Board]]:
+        def listify(line: str, delim: str = " ") -> List[int]:
+            return [int(n) for n in line.split(delim) if n != ""]
+
+        draw_order = listify(input[0], delim=",")
+        boards: List[Board] = []
+        for l in input[1:]:
+            if l == "":
+                boards.append([])
+                continue
+            boards[-1].append(listify(l))
+
+        return draw_order, boards
+
+    def bingo(board: Board, draw: List[int]) -> bool:
+        assert len(board) == len(board[0])
+
+        def line(l: int) -> bool:
+            return all(n in draw for n in board[l])
+
+        def row(r: int) -> bool:
+            return all(board[i][r] in draw for i in range(len(board)))
+
+        lines = [line(i) for i in range(len(board))]
+        rows = [row(i) for i in range(len(board[0]))]
+
+        return any(itertools.chain(lines, rows))
+
+    draw_order, boards = parse_input()
+
+    draw = []
+    for d in draw_order:
+        draw.append(d)
+        for b in boards:
+            if not bingo(b, draw):
+                continue
+            return d * sum(n for n in itertools.chain.from_iterable(b) if n not in draw)
+
+    # Sanity check
+    assert False
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d04/ex1/input b/2021/d04/ex1/input
new file mode 100644
index 0000000..dc5dffc
--- /dev/null
+++ b/2021/d04/ex1/input
@@ -0,0 +1,601 @@
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diff --git a/2021/d04/ex2/ex2.py b/2021/d04/ex2/ex2.py
new file mode 100755
index 0000000..9928698
--- /dev/null
+++ b/2021/d04/ex2/ex2.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List, Tuple
+
+Board = List[List[int]]
+
+
+def solve(input: List[str]) -> int:
+    def parse_input() -> Tuple[List[int], List[Board]]:
+        def listify(line: str, delim: str = " ") -> List[int]:
+            return [int(n) for n in line.split(delim) if n != ""]
+
+        draw_order = listify(input[0], delim=",")
+        boards: List[Board] = []
+        for l in input[1:]:
+            if l == "":
+                boards.append([])
+                continue
+            boards[-1].append(listify(l))
+
+        return draw_order, boards
+
+    def bingo(board: Board, draw: List[int]) -> bool:
+        assert len(board) == len(board[0])
+
+        def line(l: int) -> bool:
+            return all(n in draw for n in board[l])
+
+        def row(r: int) -> bool:
+            return all(board[i][r] in draw for i in range(len(board)))
+
+        lines = [line(i) for i in range(len(board))]
+        rows = [row(i) for i in range(len(board[0]))]
+
+        return any(itertools.chain(lines, rows))
+
+    draw_order, boards = parse_input()
+
+    draw = []
+    losers = set(range(len(boards)))
+
+    for d in draw_order:
+        draw.append(d)
+        for i, b in enumerate(boards):
+            # Stop early if we already know this board wins
+            if i not in losers:
+                continue
+            if not bingo(b, draw):
+                continue
+            # Discard winners until the last one
+            if len(losers) != 1:
+                losers.discard(i)
+                continue
+            # At thid point, we must be looking at the last winning board
+            return d * sum(n for n in itertools.chain.from_iterable(b) if n not in draw)
+
+    # Sanity check
+    assert False
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d04/ex2/input b/2021/d04/ex2/input
new file mode 100644
index 0000000..dc5dffc
--- /dev/null
+++ b/2021/d04/ex2/input
@@ -0,0 +1,601 @@
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+
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diff --git a/2021/d05/ex1/ex1.py b/2021/d05/ex1/ex1.py
new file mode 100755
index 0000000..1281378
--- /dev/null
+++ b/2021/d05/ex1/ex1.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections import Counter
+from dataclasses import dataclass
+from typing import Iterable, List, Tuple
+
+
+@dataclass
+class Point:
+    x: int
+    y: int
+
+
+Line = Tuple[Point, Point]
+
+
+def solve(input: List[str]) -> int:
+    def parse_line(line: str) -> Line:
+        def parse_point(point: str) -> Point:
+            x, y = map(int, point.split(","))
+            return Point(x, y)
+
+        p1, p2 = map(parse_point, line.split(" -> "))
+        return (p1, p2)
+
+    def is_of_interest(line: Line) -> bool:
+        p1, p2 = line
+        return p1.x == p2.x or p1.y == p2.y
+
+    def line_to_points(line: Line) -> Iterable[Point]:
+        def inclusive_range_any_order(a: int, b: int) -> Iterable[int]:
+            if a < b:
+                yield from range(a, b + 1)
+            else:
+                yield from range(a, b - 1, -1)
+
+        p1, p2 = line
+
+        if p1.x == p2.x:
+            for y in inclusive_range_any_order(p1.y, p2.y):
+                yield (p1.x, y)
+            return
+
+        if p1.y == p2.y:
+            for x in inclusive_range_any_order(p1.x, p2.x):
+                yield (x, p1.y)
+            return
+
+        assert False  # Sanity check
+
+    lines = list(filter(is_of_interest, map(parse_line, input)))
+    counts = Counter(itertools.chain.from_iterable(line_to_points(l) for l in lines))
+
+    return sum(counts[p] > 1 for p in counts)
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d05/ex1/input b/2021/d05/ex1/input
new file mode 100644
index 0000000..abdeeb9
--- /dev/null
+++ b/2021/d05/ex1/input
@@ -0,0 +1,500 @@
+284,294 -> 733,743
+625,347 -> 653,375
+561,848 -> 561,181
+836,102 -> 836,339
+946,941 -> 22,17
+18,954 -> 956,16
+370,142 -> 370,700
+990,966 -> 677,966
+366,603 -> 366,465
+728,942 -> 57,271
+615,493 -> 847,493
+584,281 -> 301,281
+125,356 -> 301,180
+941,569 -> 555,183
+151,116 -> 509,116
+41,18 -> 841,818
+627,670 -> 627,630
+965,472 -> 965,100
+93,404 -> 330,641
+475,963 -> 475,514
+389,389 -> 389,326
+842,565 -> 842,576
+454,700 -> 650,700
+73,810 -> 73,319
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+527,329 -> 527,292
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+639,730 -> 176,730
+46,964 -> 46,458
+727,422 -> 435,714
+28,552 -> 404,552
+33,108 -> 33,21
+227,249 -> 327,249
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+201,745 -> 410,745
+408,713 -> 408,847
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+199,780 -> 670,780
+877,947 -> 340,410
+163,202 -> 163,91
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+582,749 -> 582,12
+80,40 -> 80,704
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+557,927 -> 557,938
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+567,816 -> 567,956
+323,773 -> 323,364
+864,980 -> 864,12
+611,699 -> 611,886
+613,392 -> 901,104
+528,905 -> 156,905
+632,206 -> 798,40
+338,237 -> 919,818
+256,889 -> 11,644
+835,52 -> 55,832
+464,144 -> 322,144
+254,747 -> 254,509
+866,892 -> 866,916
+827,946 -> 30,149
+899,84 -> 177,806
+134,634 -> 357,634
+781,492 -> 244,492
+817,762 -> 817,976
+818,749 -> 818,860
+262,480 -> 263,480
+409,576 -> 409,698
+242,151 -> 981,890
+149,519 -> 149,557
+42,990 -> 42,930
+687,974 -> 50,337
+758,382 -> 465,382
+760,861 -> 760,934
+17,835 -> 17,915
+645,923 -> 645,648
+702,116 -> 72,746
+153,162 -> 955,964
+185,101 -> 918,834
+554,179 -> 554,353
+879,673 -> 879,949
+368,13 -> 368,512
+582,105 -> 591,114
+146,291 -> 600,745
+609,538 -> 930,538
+320,604 -> 320,146
+566,698 -> 443,575
+167,708 -> 844,31
+712,630 -> 712,421
+912,930 -> 64,82
+980,931 -> 87,38
+23,893 -> 888,28
+640,435 -> 676,435
+701,516 -> 190,516
+684,145 -> 62,767
+127,471 -> 91,435
+685,197 -> 78,197
+103,493 -> 103,522
+309,986 -> 309,850
+938,270 -> 938,300
+295,72 -> 354,72
+948,889 -> 948,455
+254,733 -> 254,175
+95,329 -> 942,329
+19,672 -> 19,445
+206,807 -> 206,934
+886,961 -> 886,690
+117,386 -> 117,292
+199,59 -> 668,528
+299,263 -> 299,878
+28,295 -> 638,905
+10,140 -> 276,406
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+514,261 -> 10,765
+691,673 -> 776,758
+131,430 -> 152,430
+858,85 -> 62,85
+394,846 -> 270,970
+827,913 -> 827,376
+634,669 -> 910,669
+12,53 -> 945,986
+782,467 -> 782,421
+159,832 -> 109,832
+793,807 -> 79,93
+120,584 -> 356,584
+645,16 -> 645,355
+526,685 -> 217,376
+296,305 -> 296,929
+954,144 -> 954,839
+748,88 -> 103,733
+523,804 -> 473,754
+524,316 -> 524,756
+696,183 -> 912,183
+288,564 -> 55,797
+568,103 -> 568,348
+468,626 -> 682,412
+163,163 -> 961,961
+762,824 -> 27,89
+623,625 -> 32,34
+865,343 -> 490,718
+259,458 -> 259,33
+944,660 -> 944,176
+781,804 -> 826,759
+15,702 -> 15,553
+403,310 -> 918,825
+438,734 -> 835,734
+825,13 -> 825,245
+129,611 -> 370,611
+49,939 -> 172,939
+687,906 -> 687,532
+629,482 -> 273,126
+727,218 -> 424,218
+447,451 -> 233,451
+142,779 -> 813,779
+527,27 -> 527,804
+482,55 -> 482,200
+39,264 -> 806,264
+884,636 -> 458,636
+467,121 -> 199,389
+856,925 -> 856,666
+666,359 -> 378,359
+11,946 -> 705,946
+491,281 -> 940,730
+86,112 -> 918,944
+974,807 -> 974,707
+445,67 -> 914,536
+953,394 -> 953,822
+468,398 -> 157,87
+231,620 -> 231,646
+979,869 -> 979,911
+450,330 -> 450,79
+675,659 -> 617,659
+66,181 -> 66,723
+181,406 -> 181,192
+908,334 -> 908,526
+254,891 -> 282,891
+777,791 -> 127,141
+469,58 -> 694,58
+954,957 -> 566,569
+957,957 -> 123,123
+741,359 -> 741,986
+763,526 -> 763,101
+857,427 -> 600,170
+527,756 -> 490,719
+625,249 -> 397,249
+798,702 -> 712,702
+868,75 -> 868,853
+332,296 -> 332,629
+211,829 -> 100,940
+12,139 -> 12,218
+655,978 -> 655,242
+99,852 -> 855,96
+486,267 -> 486,855
+474,90 -> 474,244
+948,491 -> 186,491
+896,59 -> 278,677
+295,732 -> 629,732
+860,936 -> 860,556
+143,790 -> 143,26
+371,847 -> 395,847
+739,301 -> 739,44
+384,716 -> 748,716
+848,423 -> 848,923
+855,23 -> 218,660
+381,805 -> 381,438
+451,610 -> 91,610
+906,957 -> 191,957
+118,675 -> 169,675
+836,818 -> 95,818
+368,945 -> 825,488
+165,299 -> 899,299
+392,327 -> 926,861
+663,16 -> 131,548
+630,302 -> 888,302
+206,869 -> 206,331
+979,413 -> 979,204
+894,860 -> 62,28
+444,897 -> 962,379
+550,158 -> 550,885
+845,736 -> 811,736
+846,857 -> 12,857
+981,730 -> 981,154
+694,835 -> 88,835
+21,101 -> 21,385
+19,960 -> 964,15
+283,721 -> 450,721
+59,136 -> 758,835
+287,313 -> 719,313
+471,252 -> 849,630
+682,189 -> 168,189
+10,921 -> 774,157
+884,598 -> 884,540
+207,615 -> 207,443
+627,408 -> 67,408
+285,36 -> 285,792
+116,585 -> 254,585
+183,86 -> 183,702
+220,138 -> 868,138
+833,68 -> 286,615
+367,534 -> 766,534
+907,514 -> 621,228
+133,593 -> 133,581
+164,727 -> 768,123
+566,227 -> 566,555
+983,988 -> 105,110
+620,177 -> 620,821
+612,413 -> 612,176
+168,889 -> 168,210
+871,487 -> 559,175
+399,870 -> 761,870
+236,976 -> 582,630
+699,216 -> 699,887
+153,745 -> 790,745
+444,749 -> 444,257
+808,165 -> 939,165
+546,525 -> 95,976
+583,179 -> 373,389
+235,816 -> 840,816
+744,89 -> 832,89
+425,317 -> 465,357
+267,235 -> 114,82
+887,59 -> 572,374
+808,237 -> 808,626
+431,352 -> 400,383
+815,376 -> 815,905
+249,218 -> 989,958
+120,435 -> 357,198
+807,551 -> 490,234
+910,524 -> 910,725
+802,304 -> 447,659
+789,228 -> 678,339
+229,322 -> 52,322
+658,393 -> 506,393
+378,438 -> 378,569
+163,981 -> 473,671
+537,984 -> 935,586
+58,945 -> 966,37
+132,696 -> 565,263
+136,813 -> 136,284
+606,656 -> 298,348
+533,572 -> 673,712
+872,912 -> 301,341
+16,287 -> 16,613
+571,541 -> 980,950
+117,495 -> 35,495
+85,79 -> 682,676
+425,431 -> 117,739
+982,984 -> 10,12
+28,75 -> 431,478
+259,529 -> 259,436
+762,267 -> 170,859
+323,135 -> 929,741
+81,238 -> 561,718
+128,213 -> 876,961
+649,466 -> 649,540
+715,863 -> 119,863
+830,624 -> 794,660
+123,968 -> 977,114
+489,466 -> 489,811
+27,10 -> 980,963
+255,732 -> 255,484
+574,829 -> 431,829
+548,743 -> 22,217
+903,297 -> 903,763
+684,774 -> 64,154
+260,823 -> 683,823
+422,211 -> 422,826
+10,196 -> 988,196
+108,802 -> 15,802
+104,70 -> 104,452
+885,59 -> 885,36
+68,854 -> 68,774
+731,935 -> 731,718
+657,986 -> 617,986
+732,292 -> 732,32
+841,56 -> 841,83
+74,108 -> 862,896
+654,895 -> 323,895
+374,952 -> 374,217
+90,723 -> 750,63
+246,89 -> 911,754
+453,301 -> 755,301
+983,988 -> 23,28
+81,705 -> 133,757
+752,743 -> 752,397
+53,243 -> 449,639
+451,811 -> 451,187
+26,672 -> 26,699
+254,861 -> 943,861
+643,740 -> 643,966
+486,655 -> 149,318
+375,146 -> 375,973
+76,293 -> 103,293
+246,398 -> 246,248
+324,392 -> 595,121
+130,577 -> 131,577
+380,623 -> 549,454
+224,181 -> 985,942
+310,223 -> 310,594
+23,982 -> 23,738
+19,858 -> 832,858
+726,531 -> 726,578
+730,433 -> 196,433
+606,599 -> 242,599
+444,832 -> 444,238
+198,870 -> 47,870
+944,473 -> 795,473
+737,386 -> 178,945
+328,902 -> 328,644
+422,851 -> 567,851
+674,781 -> 215,781
+920,757 -> 302,757
+225,932 -> 640,517
+359,337 -> 791,337
+935,430 -> 935,262
+772,850 -> 280,358
+175,829 -> 175,451
+938,204 -> 234,908
+253,749 -> 308,749
+704,458 -> 468,458
+222,95 -> 743,616
+968,840 -> 123,840
+491,619 -> 491,889
+979,580 -> 979,459
+901,193 -> 171,923
+246,155 -> 246,680
+711,755 -> 247,755
+671,734 -> 475,734
+803,783 -> 129,109
+145,890 -> 920,115
+463,521 -> 463,700
+782,99 -> 782,311
+547,467 -> 630,467
+14,88 -> 795,869
+653,899 -> 653,90
+488,874 -> 488,570
+93,879 -> 645,327
+320,658 -> 40,938
+611,246 -> 611,22
+258,935 -> 258,829
+931,436 -> 931,263
+252,460 -> 252,461
+490,382 -> 965,382
+242,89 -> 242,617
+271,111 -> 595,435
+462,706 -> 242,486
+557,328 -> 747,328
+486,99 -> 486,333
+156,40 -> 488,372
+323,482 -> 138,297
+595,539 -> 812,756
+923,861 -> 377,315
+934,952 -> 256,274
+314,777 -> 314,12
+508,47 -> 508,144
+888,807 -> 701,807
+745,774 -> 878,907
+740,716 -> 740,215
+62,43 -> 62,12
+571,196 -> 454,196
+568,107 -> 408,107
+549,676 -> 404,676
+595,573 -> 595,970
+148,168 -> 193,123
+763,71 -> 759,71
+797,64 -> 307,64
+959,984 -> 32,57
+457,562 -> 634,562
+127,521 -> 601,47
+112,296 -> 112,120
+148,755 -> 451,755
+636,494 -> 870,494
+910,242 -> 945,277
+912,911 -> 912,892
+759,815 -> 759,314
+391,285 -> 391,959
+455,460 -> 182,460
+112,78 -> 112,385
+842,179 -> 842,592
+236,424 -> 421,424
+508,907 -> 30,907
+637,219 -> 34,822
+503,375 -> 503,205
+570,533 -> 626,533
+658,11 -> 658,94
+179,286 -> 326,433
+918,214 -> 200,932
+339,887 -> 81,887
+794,91 -> 50,835
+225,356 -> 225,261
+80,160 -> 80,335
+148,64 -> 847,763
+595,393 -> 941,393
diff --git a/2021/d05/ex2/ex2.py b/2021/d05/ex2/ex2.py
new file mode 100755
index 0000000..9a63990
--- /dev/null
+++ b/2021/d05/ex2/ex2.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections import Counter
+from dataclasses import dataclass
+from typing import Iterable, List, Tuple
+
+
+@dataclass
+class Point:
+    x: int
+    y: int
+
+
+Line = Tuple[Point, Point]
+
+
+def solve(input: List[str]) -> int:
+    def parse_line(line: str) -> Line:
+        def parse_point(point: str) -> Point:
+            x, y = map(int, point.split(","))
+            return Point(x, y)
+
+        p1, p2 = map(parse_point, line.split(" -> "))
+        return (p1, p2)
+
+    def line_to_points(line: Line) -> Iterable[Point]:
+        def inclusive_range_any_order(a: int, b: int) -> Iterable[int]:
+            if a < b:
+                yield from range(a, b + 1)
+            else:
+                yield from range(a, b - 1, -1)
+
+        p1, p2 = line
+
+        xs = inclusive_range_any_order(p1.x, p2.x)
+        ys = inclusive_range_any_order(p1.y, p2.y)
+
+        if p1.x == p2.x:
+            xs = itertools.repeat(p1.x)
+
+        if p1.y == p2.y:
+            ys = itertools.repeat(p1.y)
+
+        yield from zip(xs, ys)
+
+    lines = list(map(parse_line, input))
+    counts = Counter(itertools.chain.from_iterable(line_to_points(l) for l in lines))
+
+    return sum(counts[p] > 1 for p in counts)
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d05/ex2/input b/2021/d05/ex2/input
new file mode 100644
index 0000000..abdeeb9
--- /dev/null
+++ b/2021/d05/ex2/input
@@ -0,0 +1,500 @@
+284,294 -> 733,743
+625,347 -> 653,375
+561,848 -> 561,181
+836,102 -> 836,339
+946,941 -> 22,17
+18,954 -> 956,16
+370,142 -> 370,700
+990,966 -> 677,966
+366,603 -> 366,465
+728,942 -> 57,271
+615,493 -> 847,493
+584,281 -> 301,281
+125,356 -> 301,180
+941,569 -> 555,183
+151,116 -> 509,116
+41,18 -> 841,818
+627,670 -> 627,630
+965,472 -> 965,100
+93,404 -> 330,641
+475,963 -> 475,514
+389,389 -> 389,326
+842,565 -> 842,576
+454,700 -> 650,700
+73,810 -> 73,319
+450,212 -> 450,284
+316,392 -> 316,697
+915,592 -> 578,592
+622,485 -> 434,485
+109,853 -> 952,10
+305,73 -> 305,222
+27,489 -> 157,489
+191,979 -> 867,979
+527,329 -> 527,292
+301,645 -> 301,162
+639,730 -> 176,730
+46,964 -> 46,458
+727,422 -> 435,714
+28,552 -> 404,552
+33,108 -> 33,21
+227,249 -> 327,249
+414,903 -> 784,903
+69,422 -> 888,422
+422,924 -> 103,605
+793,353 -> 450,10
+714,682 -> 714,972
+201,745 -> 410,745
+408,713 -> 408,847
+174,842 -> 818,198
+863,353 -> 775,353
+199,780 -> 670,780
+877,947 -> 340,410
+163,202 -> 163,91
+955,919 -> 955,585
+836,271 -> 533,271
+258,366 -> 728,836
+582,749 -> 582,12
+80,40 -> 80,704
+287,213 -> 287,635
+390,546 -> 390,194
+837,511 -> 538,810
+473,281 -> 902,281
+851,865 -> 731,745
+918,59 -> 445,532
+796,215 -> 796,248
+875,111 -> 604,111
+660,805 -> 538,805
+507,850 -> 145,850
+585,861 -> 585,52
+426,74 -> 700,348
+206,405 -> 529,405
+418,333 -> 418,17
+368,457 -> 33,792
+186,81 -> 957,852
+505,283 -> 113,283
+20,878 -> 462,878
+750,237 -> 69,918
+15,280 -> 358,623
+798,981 -> 500,683
+965,970 -> 22,970
+950,970 -> 148,970
+660,392 -> 660,884
+862,405 -> 862,527
+801,283 -> 801,361
+71,837 -> 136,837
+651,438 -> 945,144
+524,607 -> 614,517
+348,955 -> 138,955
+957,164 -> 404,717
+531,581 -> 454,504
+710,185 -> 710,271
+822,86 -> 822,966
+745,233 -> 490,488
+350,823 -> 663,823
+824,67 -> 447,444
+846,667 -> 796,617
+666,24 -> 666,906
+640,39 -> 640,145
+654,481 -> 985,481
+581,894 -> 416,729
+443,11 -> 697,11
+318,627 -> 799,146
+113,78 -> 891,856
+181,149 -> 179,151
+451,74 -> 451,262
+458,726 -> 314,726
+218,662 -> 533,662
+965,108 -> 527,108
+782,481 -> 896,367
+557,927 -> 557,938
+506,242 -> 941,677
+948,778 -> 948,629
+567,816 -> 567,956
+323,773 -> 323,364
+864,980 -> 864,12
+611,699 -> 611,886
+613,392 -> 901,104
+528,905 -> 156,905
+632,206 -> 798,40
+338,237 -> 919,818
+256,889 -> 11,644
+835,52 -> 55,832
+464,144 -> 322,144
+254,747 -> 254,509
+866,892 -> 866,916
+827,946 -> 30,149
+899,84 -> 177,806
+134,634 -> 357,634
+781,492 -> 244,492
+817,762 -> 817,976
+818,749 -> 818,860
+262,480 -> 263,480
+409,576 -> 409,698
+242,151 -> 981,890
+149,519 -> 149,557
+42,990 -> 42,930
+687,974 -> 50,337
+758,382 -> 465,382
+760,861 -> 760,934
+17,835 -> 17,915
+645,923 -> 645,648
+702,116 -> 72,746
+153,162 -> 955,964
+185,101 -> 918,834
+554,179 -> 554,353
+879,673 -> 879,949
+368,13 -> 368,512
+582,105 -> 591,114
+146,291 -> 600,745
+609,538 -> 930,538
+320,604 -> 320,146
+566,698 -> 443,575
+167,708 -> 844,31
+712,630 -> 712,421
+912,930 -> 64,82
+980,931 -> 87,38
+23,893 -> 888,28
+640,435 -> 676,435
+701,516 -> 190,516
+684,145 -> 62,767
+127,471 -> 91,435
+685,197 -> 78,197
+103,493 -> 103,522
+309,986 -> 309,850
+938,270 -> 938,300
+295,72 -> 354,72
+948,889 -> 948,455
+254,733 -> 254,175
+95,329 -> 942,329
+19,672 -> 19,445
+206,807 -> 206,934
+886,961 -> 886,690
+117,386 -> 117,292
+199,59 -> 668,528
+299,263 -> 299,878
+28,295 -> 638,905
+10,140 -> 276,406
+279,526 -> 921,526
+485,128 -> 856,499
+418,398 -> 186,398
+296,577 -> 296,521
+514,261 -> 10,765
+691,673 -> 776,758
+131,430 -> 152,430
+858,85 -> 62,85
+394,846 -> 270,970
+827,913 -> 827,376
+634,669 -> 910,669
+12,53 -> 945,986
+782,467 -> 782,421
+159,832 -> 109,832
+793,807 -> 79,93
+120,584 -> 356,584
+645,16 -> 645,355
+526,685 -> 217,376
+296,305 -> 296,929
+954,144 -> 954,839
+748,88 -> 103,733
+523,804 -> 473,754
+524,316 -> 524,756
+696,183 -> 912,183
+288,564 -> 55,797
+568,103 -> 568,348
+468,626 -> 682,412
+163,163 -> 961,961
+762,824 -> 27,89
+623,625 -> 32,34
+865,343 -> 490,718
+259,458 -> 259,33
+944,660 -> 944,176
+781,804 -> 826,759
+15,702 -> 15,553
+403,310 -> 918,825
+438,734 -> 835,734
+825,13 -> 825,245
+129,611 -> 370,611
+49,939 -> 172,939
+687,906 -> 687,532
+629,482 -> 273,126
+727,218 -> 424,218
+447,451 -> 233,451
+142,779 -> 813,779
+527,27 -> 527,804
+482,55 -> 482,200
+39,264 -> 806,264
+884,636 -> 458,636
+467,121 -> 199,389
+856,925 -> 856,666
+666,359 -> 378,359
+11,946 -> 705,946
+491,281 -> 940,730
+86,112 -> 918,944
+974,807 -> 974,707
+445,67 -> 914,536
+953,394 -> 953,822
+468,398 -> 157,87
+231,620 -> 231,646
+979,869 -> 979,911
+450,330 -> 450,79
+675,659 -> 617,659
+66,181 -> 66,723
+181,406 -> 181,192
+908,334 -> 908,526
+254,891 -> 282,891
+777,791 -> 127,141
+469,58 -> 694,58
+954,957 -> 566,569
+957,957 -> 123,123
+741,359 -> 741,986
+763,526 -> 763,101
+857,427 -> 600,170
+527,756 -> 490,719
+625,249 -> 397,249
+798,702 -> 712,702
+868,75 -> 868,853
+332,296 -> 332,629
+211,829 -> 100,940
+12,139 -> 12,218
+655,978 -> 655,242
+99,852 -> 855,96
+486,267 -> 486,855
+474,90 -> 474,244
+948,491 -> 186,491
+896,59 -> 278,677
+295,732 -> 629,732
+860,936 -> 860,556
+143,790 -> 143,26
+371,847 -> 395,847
+739,301 -> 739,44
+384,716 -> 748,716
+848,423 -> 848,923
+855,23 -> 218,660
+381,805 -> 381,438
+451,610 -> 91,610
+906,957 -> 191,957
+118,675 -> 169,675
+836,818 -> 95,818
+368,945 -> 825,488
+165,299 -> 899,299
+392,327 -> 926,861
+663,16 -> 131,548
+630,302 -> 888,302
+206,869 -> 206,331
+979,413 -> 979,204
+894,860 -> 62,28
+444,897 -> 962,379
+550,158 -> 550,885
+845,736 -> 811,736
+846,857 -> 12,857
+981,730 -> 981,154
+694,835 -> 88,835
+21,101 -> 21,385
+19,960 -> 964,15
+283,721 -> 450,721
+59,136 -> 758,835
+287,313 -> 719,313
+471,252 -> 849,630
+682,189 -> 168,189
+10,921 -> 774,157
+884,598 -> 884,540
+207,615 -> 207,443
+627,408 -> 67,408
+285,36 -> 285,792
+116,585 -> 254,585
+183,86 -> 183,702
+220,138 -> 868,138
+833,68 -> 286,615
+367,534 -> 766,534
+907,514 -> 621,228
+133,593 -> 133,581
+164,727 -> 768,123
+566,227 -> 566,555
+983,988 -> 105,110
+620,177 -> 620,821
+612,413 -> 612,176
+168,889 -> 168,210
+871,487 -> 559,175
+399,870 -> 761,870
+236,976 -> 582,630
+699,216 -> 699,887
+153,745 -> 790,745
+444,749 -> 444,257
+808,165 -> 939,165
+546,525 -> 95,976
+583,179 -> 373,389
+235,816 -> 840,816
+744,89 -> 832,89
+425,317 -> 465,357
+267,235 -> 114,82
+887,59 -> 572,374
+808,237 -> 808,626
+431,352 -> 400,383
+815,376 -> 815,905
+249,218 -> 989,958
+120,435 -> 357,198
+807,551 -> 490,234
+910,524 -> 910,725
+802,304 -> 447,659
+789,228 -> 678,339
+229,322 -> 52,322
+658,393 -> 506,393
+378,438 -> 378,569
+163,981 -> 473,671
+537,984 -> 935,586
+58,945 -> 966,37
+132,696 -> 565,263
+136,813 -> 136,284
+606,656 -> 298,348
+533,572 -> 673,712
+872,912 -> 301,341
+16,287 -> 16,613
+571,541 -> 980,950
+117,495 -> 35,495
+85,79 -> 682,676
+425,431 -> 117,739
+982,984 -> 10,12
+28,75 -> 431,478
+259,529 -> 259,436
+762,267 -> 170,859
+323,135 -> 929,741
+81,238 -> 561,718
+128,213 -> 876,961
+649,466 -> 649,540
+715,863 -> 119,863
+830,624 -> 794,660
+123,968 -> 977,114
+489,466 -> 489,811
+27,10 -> 980,963
+255,732 -> 255,484
+574,829 -> 431,829
+548,743 -> 22,217
+903,297 -> 903,763
+684,774 -> 64,154
+260,823 -> 683,823
+422,211 -> 422,826
+10,196 -> 988,196
+108,802 -> 15,802
+104,70 -> 104,452
+885,59 -> 885,36
+68,854 -> 68,774
+731,935 -> 731,718
+657,986 -> 617,986
+732,292 -> 732,32
+841,56 -> 841,83
+74,108 -> 862,896
+654,895 -> 323,895
+374,952 -> 374,217
+90,723 -> 750,63
+246,89 -> 911,754
+453,301 -> 755,301
+983,988 -> 23,28
+81,705 -> 133,757
+752,743 -> 752,397
+53,243 -> 449,639
+451,811 -> 451,187
+26,672 -> 26,699
+254,861 -> 943,861
+643,740 -> 643,966
+486,655 -> 149,318
+375,146 -> 375,973
+76,293 -> 103,293
+246,398 -> 246,248
+324,392 -> 595,121
+130,577 -> 131,577
+380,623 -> 549,454
+224,181 -> 985,942
+310,223 -> 310,594
+23,982 -> 23,738
+19,858 -> 832,858
+726,531 -> 726,578
+730,433 -> 196,433
+606,599 -> 242,599
+444,832 -> 444,238
+198,870 -> 47,870
+944,473 -> 795,473
+737,386 -> 178,945
+328,902 -> 328,644
+422,851 -> 567,851
+674,781 -> 215,781
+920,757 -> 302,757
+225,932 -> 640,517
+359,337 -> 791,337
+935,430 -> 935,262
+772,850 -> 280,358
+175,829 -> 175,451
+938,204 -> 234,908
+253,749 -> 308,749
+704,458 -> 468,458
+222,95 -> 743,616
+968,840 -> 123,840
+491,619 -> 491,889
+979,580 -> 979,459
+901,193 -> 171,923
+246,155 -> 246,680
+711,755 -> 247,755
+671,734 -> 475,734
+803,783 -> 129,109
+145,890 -> 920,115
+463,521 -> 463,700
+782,99 -> 782,311
+547,467 -> 630,467
+14,88 -> 795,869
+653,899 -> 653,90
+488,874 -> 488,570
+93,879 -> 645,327
+320,658 -> 40,938
+611,246 -> 611,22
+258,935 -> 258,829
+931,436 -> 931,263
+252,460 -> 252,461
+490,382 -> 965,382
+242,89 -> 242,617
+271,111 -> 595,435
+462,706 -> 242,486
+557,328 -> 747,328
+486,99 -> 486,333
+156,40 -> 488,372
+323,482 -> 138,297
+595,539 -> 812,756
+923,861 -> 377,315
+934,952 -> 256,274
+314,777 -> 314,12
+508,47 -> 508,144
+888,807 -> 701,807
+745,774 -> 878,907
+740,716 -> 740,215
+62,43 -> 62,12
+571,196 -> 454,196
+568,107 -> 408,107
+549,676 -> 404,676
+595,573 -> 595,970
+148,168 -> 193,123
+763,71 -> 759,71
+797,64 -> 307,64
+959,984 -> 32,57
+457,562 -> 634,562
+127,521 -> 601,47
+112,296 -> 112,120
+148,755 -> 451,755
+636,494 -> 870,494
+910,242 -> 945,277
+912,911 -> 912,892
+759,815 -> 759,314
+391,285 -> 391,959
+455,460 -> 182,460
+112,78 -> 112,385
+842,179 -> 842,592
+236,424 -> 421,424
+508,907 -> 30,907
+637,219 -> 34,822
+503,375 -> 503,205
+570,533 -> 626,533
+658,11 -> 658,94
+179,286 -> 326,433
+918,214 -> 200,932
+339,887 -> 81,887
+794,91 -> 50,835
+225,356 -> 225,261
+80,160 -> 80,335
+148,64 -> 847,763
+595,393 -> 941,393
diff --git a/2021/d06/ex1/ex1.py b/2021/d06/ex1/ex1.py
new file mode 100755
index 0000000..d6c0a79
--- /dev/null
+++ b/2021/d06/ex1/ex1.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections import Counter
+from dataclasses import dataclass
+from typing import Iterator, List, Tuple
+
+
+def nth(iterable: Iterator[int], n: int) -> int:
+    return next(itertools.islice(iterable, n, None))
+
+
+def solve(input: List[str]) -> int:
+    fish = [0] * 9
+    for n, count in Counter(map(int, input[0].split(","))).items():
+        fish[n] = count
+
+    def step(fish: List[int]) -> List[int]:
+        # Count how many clones happen
+        new_fish = fish[0]
+
+        # Do the next cycle
+        fish[0:-1] = fish[1:]
+        fish[6] += new_fish
+        fish[8] = new_fish  # Override number of new fish
+
+        return fish
+
+    def iter(fish: List[int]) -> Iterator[List[int]]:
+        while True:
+            yield (fish := step(fish))
+
+    return sum(nth(iter(fish), 80 - 1))
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d06/ex1/input b/2021/d06/ex1/input
new file mode 100644
index 0000000..87141dd
--- /dev/null
+++ b/2021/d06/ex1/input
@@ -0,0 +1 @@
+3,1,4,2,1,1,1,1,1,1,1,4,1,4,1,2,1,1,2,1,3,4,5,1,1,4,1,3,3,1,1,1,1,3,3,1,3,3,1,5,5,1,1,3,1,1,2,1,1,1,3,1,4,3,2,1,4,3,3,1,1,1,1,5,1,4,1,1,1,4,1,4,4,1,5,1,1,4,5,1,1,2,1,1,1,4,1,2,1,1,1,1,1,1,5,1,3,1,1,4,4,1,1,5,1,2,1,1,1,1,5,1,3,1,1,1,2,2,1,4,1,3,1,4,1,2,1,1,1,1,1,3,2,5,4,4,1,3,2,1,4,1,3,1,1,1,2,1,1,5,1,2,1,1,1,2,1,4,3,1,1,1,4,1,1,1,1,1,2,2,1,1,5,1,1,3,1,2,5,5,1,4,1,1,1,1,1,2,1,1,1,1,4,5,1,1,1,1,1,1,1,1,1,3,4,4,1,1,4,1,3,4,1,5,4,2,5,1,2,1,1,1,1,1,1,4,3,2,1,1,3,2,5,2,5,5,1,3,1,2,1,1,1,1,1,1,1,1,1,3,1,1,1,3,1,4,1,4,2,1,3,4,1,1,1,2,3,1,1,1,4,1,2,5,1,2,1,5,1,1,2,1,2,1,1,1,1,4,3,4,1,5,5,4,1,1,5,2,1,3
diff --git a/2021/d06/ex2/ex2.py b/2021/d06/ex2/ex2.py
new file mode 100755
index 0000000..f89cd44
--- /dev/null
+++ b/2021/d06/ex2/ex2.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from collections import Counter
+from dataclasses import dataclass
+from typing import Iterator, List, Tuple
+
+
+def nth(iterable: Iterator[int], n: int) -> int:
+    return next(itertools.islice(iterable, n, None))
+
+
+def solve(input: List[str]) -> int:
+    fish = [0] * 9
+    for n, count in Counter(map(int, input[0].split(","))).items():
+        fish[n] = count
+
+    def step(fish: List[int]) -> List[int]:
+        # Count how many clones happen
+        new_fish = fish[0]
+
+        # Do the next cycle
+        fish[0:-1] = fish[1:]
+        fish[6] += new_fish
+        fish[8] = new_fish  # Override number of new fish
+
+        return fish
+
+    def iter(fish: List[int]) -> Iterator[List[int]]:
+        while True:
+            yield (fish := step(fish))
+
+    return sum(nth(iter(fish), 256 - 1))
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/2021/d06/ex2/input b/2021/d06/ex2/input
new file mode 100644
index 0000000..87141dd
--- /dev/null
+++ b/2021/d06/ex2/input
@@ -0,0 +1 @@
+3,1,4,2,1,1,1,1,1,1,1,4,1,4,1,2,1,1,2,1,3,4,5,1,1,4,1,3,3,1,1,1,1,3,3,1,3,3,1,5,5,1,1,3,1,1,2,1,1,1,3,1,4,3,2,1,4,3,3,1,1,1,1,5,1,4,1,1,1,4,1,4,4,1,5,1,1,4,5,1,1,2,1,1,1,4,1,2,1,1,1,1,1,1,5,1,3,1,1,4,4,1,1,5,1,2,1,1,1,1,5,1,3,1,1,1,2,2,1,4,1,3,1,4,1,2,1,1,1,1,1,3,2,5,4,4,1,3,2,1,4,1,3,1,1,1,2,1,1,5,1,2,1,1,1,2,1,4,3,1,1,1,4,1,1,1,1,1,2,2,1,1,5,1,1,3,1,2,5,5,1,4,1,1,1,1,1,2,1,1,1,1,4,5,1,1,1,1,1,1,1,1,1,3,4,4,1,1,4,1,3,4,1,5,4,2,5,1,2,1,1,1,1,1,1,4,3,2,1,1,3,2,5,2,5,5,1,3,1,2,1,1,1,1,1,1,1,1,1,3,1,1,1,3,1,4,1,4,2,1,3,4,1,1,1,2,3,1,1,1,4,1,2,5,1,2,1,5,1,1,2,1,2,1,1,1,1,4,3,4,1,5,5,4,1,1,5,2,1,3