2024: d19: ex2: add solution

2024/d12/ex1/ex1.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+
+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 (
+            (-1, 0),
+            (1, 0),
+            (0, -1),
+            (0, 1),
+        ):
+            yield Point(self.x + dx, self.y + dy)
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> dict[Point, str]:
+        return {
+            Point(x, y): c for x, line in enumerate(input) for y, c in enumerate(line)
+        }
+
+    def find_plots(garden: dict[Point, str]) -> list[set[Point]]:
+        res: list[set[Point]] = []
+        visited: set[Point] = set()
+
+        for p, plant in garden.items():
+            if p in visited:
+                continue
+            plot: set[Point] = set()
+            to_visit = {p}
+            while to_visit:
+                p = to_visit.pop()
+                visited.add(p)
+                plot.add(p)
+                assert garden[p] == plant  # Sanity check
+                for n in p.neighbours():
+                    if garden.get(n) != plant:
+                        continue
+                    if n in visited:
+                        continue
+                    to_visit.add(n)
+            res.append(plot)
+        return res
+
+    def fence_price(plot: set[Point]) -> int:
+        area = len(plot)
+        perimeter = sum(n not in plot for p in plot for n in p.neighbours())
+        return area * perimeter
+
+    garden = parse(input.splitlines())
+    plots = find_plots(garden)
+    return sum(map(fence_price, plots))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d12/ex2/ex2.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+
+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 (
+            (-1, 0),
+            (1, 0),
+            (0, -1),
+            (0, 1),
+        ):
+            yield Point(self.x + dx, self.y + dy)
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> dict[Point, str]:
+        return {
+            Point(x, y): c for x, line in enumerate(input) for y, c in enumerate(line)
+        }
+
+    def find_plots(garden: dict[Point, str]) -> list[set[Point]]:
+        res: list[set[Point]] = []
+        visited: set[Point] = set()
+
+        for p, plant in garden.items():
+            if p in visited:
+                continue
+            plot: set[Point] = set()
+            to_visit = {p}
+            while to_visit:
+                p = to_visit.pop()
+                visited.add(p)
+                plot.add(p)
+                assert garden[p] == plant  # Sanity check
+                for n in p.neighbours():
+                    if garden.get(n) != plant:
+                        continue
+                    if n in visited:
+                        continue
+                    to_visit.add(n)
+            res.append(plot)
+        return res
+
+    def count_corners(plot: set[Point]) -> int:
+        def corners(p: Point) -> int:
+            res = 0
+            for dx, dy in (
+                (-1, -1),
+                (1, 1),
+                (-1, 1),
+                (1, -1),
+            ):
+                diag = Point(p.x + dx, p.y + dy)
+                vert = Point(p.x + dx, p.y)
+                hori = Point(p.x, p.y + dy)
+                # Both sides are out: an outside corner
+                if vert not in plot and hori not in plot:
+                    res += 1
+                # Both sides are in, diagonal is out: an inside corner
+                if vert in plot and hori in plot and diag not in plot:
+                    res += 1
+            return res
+
+        return sum(corners(p) for p in plot)
+
+    def fence_price(plot: set[Point]) -> int:
+        area = len(plot)
+        # Number of sides is equal to number of corners
+        sides = count_corners(plot)
+        return area * sides
+
+    garden = parse(input.splitlines())
+    plots = find_plots(garden)
+    return sum(map(fence_price, plots))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d12/ex2/input

@@ -0,0 +1,140 @@
+TTTTTTTTTTTTTTDDDDDDDDDDDDAAAKKKKKKKKKKKKKKKKKKKKKKKRRRRRRRRRRRRRXXXXXXXXXXZFFFFFFFFFFOFVVVVVVQQQQQUQQQQQQQQQQQQQQQQQCCGGNNNNHHHHHHHHHHHHHHH
+TTTTTTTTTTTTTTDDDDDDDDDDDDAAAAAAKKKKKFKKKKKKKKKKKKKKRRRRRRRRRRRXXXXXXXXXXXXZFFFFFFFFFFFFFFFVMMQQQQQQQQQQQQQQQQQQQQQQQGGGGNNNNHHHHHHHHHHHHHHH
+TTTTTTTTTTTTDDDDDDDDDDDUAAAAAAAAAKKFFFKKKKKKKKKKKKKKRRRRRRRRRRXXXXXXXXMXMMFFFFFFFFFFFFFFFMMMMMNQQQQQQQQQQQQQQQQQQQQQZZGGNNNNHHHHHHHHHHHHHHHH
+TTTTTTTBTTTTDDDDDDDDDDUUUAAAAAAAKKKKFFKKKKKKKKKVLLLLLRRRRRRRRRXXXXXXXMMMMMFMMMMFFFFFFFFFXMMHMMNQQQQQQQIQQQQQQQQQQQQQQQGGNNNNVVVHHHHHHHHHHHHH
+TTTTBTBBTTTTDDDDDDDDDDUUUAAAAAAAKKKFFKKKKKKKKKNLLLLLLRRRRRRRRRXXXXXXXMMMMMMMMMFFFFFFFFHXXXMHHNNQQQQQQQIIIQQQQQQQQQQQQQGGVVVVVOHHHHHRRRHRHHHD
+TBBBBBBBTTTTDDDDDDDDUDUUUAAAFAAAKKKFFKFFFKKKKKKWWLLLLRRRRRROOOOOXBMMMMMMMMMMEFFMFFFFHHHHXMMHHHHQQQQQQQQIIQQQQQQQQQQQGGGGGVVVVVVZHHXRRRRRHDHD
+BBBBBBBBBTTTDDDDDDDUUUUUUGUFFFFKKKKKKFFFKKKKKKKWLLLLLLRRRROOOEOOOMMMMMMMMMMMMMUMMFFFFFHHHHHHHHHQQQQQIIIIIIQQIQQIIQQQUGGGGVVZVZZZZZRRRRRRDDHH
+BBBBBBBBTTTTDDDDDDXUUUUUUUUFFFFKKKKKKFIFKKKKKKKKLLLLLLRRLLOOOOOOOOMMMMMMMMMMMMMMFFFFFFHHHHHHHHHHHZZIIIIIIIQIIQQIIQQQGGGGGGGZZZZZZZRRRRMMHHHH
+BBBBBBBBTTTTDDXXXXXUUUUXUUFFFKKKKKKKKFEEKKKKKKKKKFLLLLLLLOOOOOOOOOMMMMMMMMMMMMMMFFFFFFFHHHHHHHHHHIIIIIIIIIIIIIIIINQQGGGGGGGZGZZZZZRRRRRRHHHH
+BBBBBBBBBBDDDDXXXXUUUUUUSFFFFKKKKKKEEEEEEKKKKKKKKFKKKLLLLLTOOOOOOOOOMMMMMMMMSWSFFFFFFFFHIIIIHHHHHMMIWIIIIIIIIIIGGGGGGGGGGGGGGGZZZZRRRRRRNHHH
+BBBBBBBBBBBDXDXXXXXXOOOOOOOOOOKKKKEEEEEKKKKKKKKKKKKKKLLLLLOOOOOOOOOOOOMMMMMMSSSSSFFFFFHIIIIIHHHHHIIIIIIIIIIIIIWGGGGGGGGGGGZGGZZZZZZRRNNNNHHN
+BBBBBBBBBBBDXXXXXXXGOOOOOOOOOOXKKKKEEEEEKKBKKKNKKKKKKKKLLLLOOOOOOOOOOOMMLLMMSSSSSSFFFFHIIIIIHHHHHIIIIIIIIIIIIIIIGGGGGGGGGGZZZZZZZZZRRRRRNHHN
+BBBBBBBBBBBBXXXXXXXXOOOOOOOOOOKKKKKKXEEEEEENKNNNKKLLKKKKLLLLLOOOOLOOLLLLLLLSSSSSSSFFFHHIIIIIHBHHHIIIIIIIIIIIIIIGGGGGGGGGGGZZZZZZZZZRZRRNNNNN
+BBBBBBBBBBBBBXXXXXXXOOOOOOOOOOXKXKKKKEEEEEENNNNNNLLLLKKKLLLLLOOOLLLLLLLLLLLSSSSSSSFFFFFIIIHBBBHHHIIIIIIIIIIIICCGGGGGGGGGGGZZZZZZZZZZZRRNNNNN
+BBBBBBBBBBBBCXXXXOOOOOOOOOOOOOXKXKKKKESSSSSSNNNLLLLLLKOOLLLLLOLLLLLLLLLLLAAASSSSSSSFFFFIIIBBBBBBIIIBIIIIIIIICCCGMGGGGGGGGZZZZZZZZZZZNNRNNNNN
+BBBBBBJBBBBXXXXXXOOOOOOOOOOOOOXXXKKKXESSSSSSSSSSSLLLLLLOOLOLLLLLLLLLLLAAAAAASSSSSSSFFFFIIIVBBBBBBIBBBIIIIIIIICGGGGGGGGGGGZZZZZZZZZZZNNNNNNNN
+BBBBBBBBBBXXXXXXXOOOOOOOOOOOOOXXXXNKXXSSSSSSSSSSSLLLLLOOOOOLLLLLLLLLLAAAAAAASSSSSSSSZFFFBBBBBBBBBBBBBBIIIIIIICCXXXGGGGGGGGGIZZZZZZZNNNNNNNNN
+FBBAABABBBFXXXXOOOOOOOOOOOOOOOXXXXNKXSSSSSSSSSSSSLLLLLLOOOOLLLLLLLLLEWAAAAAASSSSSSDDZFFFBBBBBBBBBBBBBBBIIIIICCCCCXGGGGGGGIIIZIIIZNZNNNNNNNNN
+FBBAAAAAAAXXXXXOOOOOOOOGGGVVVXXXXXXXXSSSSSSSSSSSSLLLLLLOOOOOOLOOOLLLEEEEAAASSSESSSDDZFFFBBBBBBBBBBBBBBBIBBIIIIIIIIXGXXGGIIIIIIIIINNNNNNNNNNI
+FBFAAAAAAAAAXXXOOOOOOOOGGGVVVXXXXXXXXSSSSSSSSSSSSLLLLLLOOOOOOOOOOLLEEEEAAAATSSSSDDDZZFZZSSSBBBBBBBBBBBBBBBIIIIIIIIXXXXIIIIIIIIIIINNNNNNNNNNI
+FFFFGAAAAAAAXLXOOOOOOOOGGGVVVXXXXXXXXSSSSSSSSSSSSLLLLLOOOOOOOOOOLLLEEEEAAAAASDDDDDZZZZZSSTTBBBBBOOBBBBBBBBIIIIIIIIXXIIIIIIIIIIIIIINNNNNNNNII
+FFGGGAAAAAAAXAAOOOOOOOOGGGGVVXXXXXXXXSSSSSSSNNNNLLLLLOOOOOOOOOOOLLLLEEELXDADDDDDDDZZZZZSZZTBBBBBOOOBBBBBBBIIIIIIIIXXXIIIIIIIIIIINNNNNNNNNNII
+FFFGGGGAAAAAAAAOOOOOOOOGVVGVVVVXXXXXXSSSSSSSNNLLLLBLLOOOOOOOOOOOLLLEEXXXXDDDDDDDDDZZZZZZZTTTTBBOOOBBBBBBBIIIIIIIIIXXIIIIIIIIIIINNNNNVNNVNNNI
+FFGGGPGALAAAOOOOOOOOOOOGVVVVVVVVXXXXXSSSSSSSNDDLLLLLLOOOOOOOOOOOOLLEEXXXXXDDDDDDDZZZZZZZZTTTBBOOOOOOBBBIIIIIIIIIIIIIIIIIIIIIIINNNNVVVVNVFNII
+GGGGGPGGLLAAOOOOOOOOOOOVVVVVVVXXXXXXXXXXDDDDDDDDLDDOOOOOOOOOOOOOTXXXXXXXXXXDDDDDZZZZZZZZZTTTTBBIOOOOBBBIIIIIIIIIIIXXXIIIIIIIINNNVVVVVVVVFJII
+GGGGGGGGGGGIOOOOOOOOOOOEVVVVVVXXXXXXXXXXDDDDDDDWWWWOOOOOMOOOOOOOXXXVXXXXXXXXDDDDZZZZZZZZZZTTTTLIIIIOOOOIIIIIIIIIIIXXXXIIIIIIINNNNVVVVVVVJJJI
+GGGGGGGGGGGIOOOOOOOOOOEEEEVVVVVXXXXXXXXXDDDDDDDWWWWWWWWWWOOHHOOXXXXXXXXXXXXDDDDDZZZZZZZZZZZZZZLIIIIIIIOIIIIIIIIIIIXXXXIIIIIIINNNNVVVVVVVJJJJ
+GGGGGGGGSGSMOOOOOOOOOOEEEVVVVVVVXXBXXDXDDDDDDDDWWWWWWWWWWHHHHOKGGGXXXXXXXXXDDDDDZZZZZZZZZNNNNIIIIIIIIOOIIIIIIIIIIXXXXIIIIIIINNNNNNNVVVVVVJJJ
+GGGGGGGWWWWWWWOOOOOOOOLLLLVVVSVVXXBBDDDDDDDDDDDWWWWWWWWWWHHHHGGGGGXXXXXXXXDDDDDVCZZZZZZZNNNNNIIIIIIIIIIIIIIIIIIIIXXXXIIIIIIIINNNNNTVVVVJVJJJ
+GGGGGGGWWWWWWWOOOOOOOOLLLLLLSSSXXXBDDDDDDDDDDDDWWWWWWWWWWHHHHGGGGGGXXXXXXXXDDDVVCCCZZZZIIIINNIIIIIIIIIIIIIHHHHXHHXXXXIIIIIINNNNNNNNLLLLJJJJJ
+GGGGGGGWWWWWWWOOOOOOOOLLLLLLSSSSSDDDDDDDDDDDDDDWWWWWWWWWWHHHHGNNGGGGGXXXXXXVVVYVVCVZZZIIIIINIIIIIIIIIIIIIIHHHHHHHXXXXIIJIIINNNNNNNNNLLLJJJJJ
+GGGGGGGWWWWWWWOOOOOOOOLLLLLLSSSSDDDDDDDDDPPDDDDWWWWWWWWWWHHHGGGGGGGGGXXXXXXVXVVVVVVVFZZIIIIIIIIIIIIIIIIIIIHHHHHHHXXXGGIIYNNNNNNNNNNQLLLJJJJJ
+GGGGGGGWWWWWWWOOOOOOOOLLLLLLSSSSSSSDSSSDDDPDDDDWWWWTHHTHHHHHHGYGGGGGGSXXXXXXXVVVVVVVFIIIIIIIIIIIIIIIIIIIIIHHHHHHHXXXGGYYYNNNNNYNNNNLLLLLLJJJ
+GGGGGGTWWWWWWWSOOOOOOOLLLLLVVSSVSSSDSSDDDDDDDDDWWWWTTHTTHHHHHGYGHGGGGGXXXXXXVVVVVVFFFIFFFIIIIIIIIIIIIIBHHHHHHHHHHHHGGGGYYNYYYYYNLLLLLLLLLJJJ
+GBBBBBBWWWWWWWSOOOOOOOLLLLVVVVVVVSSSSSSSDDDMDDDDDDDTTTTTHHHHHGYGHHHHGHHHSXXXXVVXXVFFFFFFFIIIIIIIIIIMIBBBBHHHHHHHHHHGGGYYYYYYYYYYLLLLLLLLLJJJ
+WBBBBBBWWWWWWWSSSSLLLLLLLLLVVVVVVVSSSSSDDDDMMMDDDDDTTTTTTTTTHGGGGHHHHHHSSSSXXVVVXXXFFFFFFFIIIIIIIIIIIBZZBBHHHHHHHHHGGGYYYYYYYYYXLLLLLLLLLLJJ
+GBBBBBBWWWWWWWSSSLLLLLLLLLLVVVVVVVSSSSSDDDDDMMMMMMTTTTTTTZZHHZZHHHHHHHSSSGSXXXXXXXFFFFFFIIIIIIIIZIZZZZZZBHHHHHHHHHGGGGGGYYYYYYYXXLLLLLLLLJJJ
+GBBBBBBBBJJJJJSSSSSLLLLLLLLVVVVVVVVVSSSDSSSMMMMMTTTTTTTTTTZZZZZZHHHHSSSSSSSSSSSSXFFFFFFFFIIIIIIZZZZZZZZZBHHTTTHHHGGGGGGGYYYYXXXXXXXLLLLLJJJJ
+LBBBBBBBBJJJJSSSSSSSHLLLLLLOOVVVVVVVVVSSSSSMMMMMMMTTTTTTTTZZZZZZZZZSSSSSSSSSSSSSFFFFFFFFFIIIZIZZZZZZZZZZZZTTTHHHHGGGGGGGGYYXXXXXXXXXLLJLJJJJ
+VBBBBBBBBJJJSSSSSSSSWLBLLLOOOVVVVVVVOZZSZSMMWMMMMTTTTTTTTTZZZZZZZZZCSSSSSSSSSSJJJJJFFFFFFFFZZZZZZZYYYYYYYYYYTTHGGGGGGGGGYYXXXXXXXXXXXLJJJJJJ
+VBBBBBBBBJJSSSSSSSSSWWLLLLOOOOVVVVVOOZZZZMVMMMMMMTTTTTTTTZZZZZZZZZZZSSSSSSSSSSSSSJFFFFFFFFLLNZZZZZYYYYYYYYYYTTGGGGGGGGGGYYYXXXXXXXXXXLJJJJJJ
+VBBBBBBBBJSSSSSSSSSSWLLLLLLOOOOOOOOOOZZZZMMMMMMMMMTTTTTTTYZZZZZZZZZZZZSSSSSSSSSSSFFFFFFFFFLLZZZZZZYYYYYYYYYYTTGGGGGGGGGGYYYXXXXXXXXXXJJJJJJJ
+VJJJJBBBBJLSSSSSSSSWWWLLWLOOOOOOOOLOZZZZZZMMMMMMMVTTTTTTTZZZZZZZZZZZSSSSSSSSSSSSSSFFFFFLLLLLZZZZZZYYYYYYYYYYTTTFFGGGFGGQQQYXCCXXXXXXXXJJJJJJ
+VVVJJBBBBLLLSSSSSSSWWWWWWWWOOOWWOLLLZZZZZZNNMMMMQTTTTTTTMMMMZZZZZZEZZSSSSSSSSSSSSLFLLFFLLLLLLZZZZKYYYYYYYYYYTFFFFGFFFGQQYYYPKCKXXXXVJJJJJJJJ
+VVVJJBBBBLLLLSSSSSSWWWWWWWWWOWWWLLLLLLZZZZZNNMMQQTTTTTTMMMMMZZZZZZESSSSSSSSSSSLSSLLLFFFLLLLLLLLLZLYYYYYYYYYYFFFFFFFFFQQQYYYPKKKKKBBJJLJJJJJJ
+BBBBJPPJLLLLLSQQLWSWWWWWWWWWOWWWLLLLLLZZZNNNNMMMTTTTTTMMMMMZZYZYYYESSSKKKSSSSLLLLLLLFLLLLLLLLLLLLLYYYYYYYYYYTFFFFFFFFQQQPPPPPKKKKBBLILJJLJJJ
+LLLLLPPJFLLLLLLLLWWWWWWWWWWWWWWWLLLLLLLLLMNMMMMTTTTTTMMMMMMMHYYYYYYYSSKKKSSSSSSSLLLLLLLLLLLLLLLLLLYYYYYYYYYYTFFFFFTTTQQTPPPXPKTKKBBLLLLLLLLJ
+LLLLLLLFFFLLLLLLLWWWWWWWWWWWAAAAZZZLLLLLMMMMMMMMMMTTTTMMMMMMMMMYYYYYYYKKKSSSSSSSLLLLLLLTTTLLYYYYYYYYYYYYYYYYFFFFFFFTQQQTPPXXTKTKPLLLLLLLLLLL
+LLLLLLLFFLLLLLLLLLWWWWWWWWWWAAAAZZZZZLLLMMMMMMMMMMMMMMMMMMMMMMYYYYYYYYYKTTTTTSSTTTTLLTLLTLLLYYYYYYYYYYYTTAAAAAFFFFZTTQTTXXXXTTTTTLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLBOOOWWWWWWAAAAZZZZZLZLLMMMMMMMMMMMMMMMMMMMMMYYYYYYYYYKKTTTTTTTTTLLTTTTTTRRYYYYYYYYYYYTTAAAAAZZZZZTTQTTTXXTTTTTTTLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLOOOOWWWWWWWWAZZZZZZZZZLLJPPMMMMMMMMMFFFFFMMYYYYYYYYYTTTTTTTTTTTLLTTTTTTTTRYYYYYYYYYYYOOOAAAAAZZZZZTTTTTTTTTTTTTTLLLLLLLLLL
+LLLLLLLLLLLLLLLLOLOOOOOWWWWWWAAZZZZZZZZZLJJPPPMLMMMMMMFCFFFMMYYYYYYYYTTTTTTTTTTTTTLLTTTTTTRRYYYYYYYYYYYOOAAAAAZZZZZZTTTTTTTTTTTTULLLLLLLLLLL
+LLLLLLLLLLLLLLLOOOOOOOOWWWWLLLAAAZZZZZZZLLJJPPMLMLLMFFFFFFFFMYYYYYYYYYYTTTTTTTTTTTTTTTTTTRRRYYYYYYYYYYYAAAAAAAZZZZZZZTTTTTTTTTTTTLLLLLLLLLLL
+LLLLLLLLLLLWLLLLOOOOOOOOWWBLLLALAAZZZZLLLLJJPPLLLLLMFFFFFFFFFFYYYYYYYYYTTTTTTTTQTTTTTTTTRRRAYYYYYYYYYYAXXXAAAAAAAAZZTTTTTTTTTTTTFFFWLLLLLLLL
+LLLLLLLLLLLLLLLLZOOOOOBBBBBLLLLLZZZZLLLLLIJJPLLLLLLMFFFFFFFFFFYYYYYYYYYYYYTTTTTTWTTTTTTRRRRRYYYYYYYYYYAACCCQQAAAAFCZTTTTTTTTTTTTTFWWLLLLLLLL
+LLLLLLLLLLLLLLLLLSOSSSBBBBBLLLLLLZLLLLILIILLPLLLLLLLFFFFFFFFFFFYYYYYYYYYTTTTTTTWWTTTTTTRRRRRAAAAAAAAAAAACCCCCAAAAFCTTTTTLLLLLLLLWFWWLLLLLLLL
+LLLLLLLLLLVLLLYLSSSSSSSSBBLLLLLLLLLLLLIIIIILLLLLLLCCCCCCCCFFFFFFYYYYYYYYTTTTWTTWWWTTTWTTTRRRRRAAAAAAAAACCCCCCCAAACCCCRTTLLLLLLLLWWWWWLLLLLLL
+LLLLLLLLLLLWLSSSSSSSSSSBBBLLLLLLLLLLLIIIIICCCCCCCCCCCCCCCCFFFFFFFYYYYYYYTTTTTTWWWWWTWWTRRRRRYAAAAAAAAAACCCCCCCCCCCCCCTTTLLLLLLLLWWWWWWLLLLLL
+LLLLLLLLLLLWWWSSSSSSSSBBBBLLLLLLLLLLLIICCCCCCCCCCCCCCCCCCCFFFFFFYYYYYYXYTGTTTTWWWWWWWRTRRRRRRAAAAAAAAAACCCCCCCCCCCCCCCCTLLLLLLLLWWWWWWWLLLLL
+LLLLLLALLLLLWWSSSSSSSSBBBLLLLLLLLLLLLIICCCCCCCCCCCCCCCCCCCPPPFFPYYYYYYXXXGTTTTXWWWWWWRRRRRRRRAAAAAAACCCCCCCCCCCCCCCCMMMMLLLLLLLLWWWWWWLLLLLL
+ALLLLLAAAWWWWSSSSZSSSSSBBLLLLLLLLLLLCCCCCCCCCCCCCCCCCCCCCCFPPPPPPYYYYXXXXXXXXXXXXWWWRRRRRRRRRAAAAAACCCCCCCCCCCCCCCCCCCMMLLLLLLLLWWMMMMVLLLLL
+AAAAAAAAWWWWWWWSZZSSSOOBBLLLLLLLLLLLCCCCCCCCCCCCCCCCCCCCCCPPPPPPPYYYYVXXXXXXXXXXWWRRRRRRRRRAAAAAAAAYYCCCCCCCCCCCCCCCCMMMLLLLLLMMWWMMMMVVVVLL
+AAAAAAAAWWWWWWWWWOSSSZOOBLLLLLLLLLLICCCCCCCCCCCCCCCCCCCCCCPPPPPPPYYYYYXXXXXXXXXXWWRRRRRRRRRRAAAAAAAYYYYCCCCCCCCCCCCCCMWWLLLLLLMMWMMMMMMVVVVV
+AAAAAAAAIWDDWWWWOOSSSOOLLLLLLLLLLLLLCCCCCCCCCCCCCCCCCCCCCCPPPPPPPPPPPXXXXXXXXXXXWWRRRRRRRRAAAAAAAAAAYYYCCCCCCCCCCCCCCHWWLLLLLLMMMMMMMMMVVVVN
+AAAVAAAKBBDDWWWOOOOOOOOOLLLLLLLLLLLUCCCCCCCCCCCCCCCCCCCCCCPPPPPPPPPPXXXXXXXXXXXXWWRRRRRRRRAAAAAAAAAAYYYYYCCCCYYYYOHHHHWMLLLLLLMMMMMMMMMVVVVV
+AAAVAAAKBBIIIOOOOOOOOVVOOVVVZZZLLLUUUUUUUUUUUIIICCCCCCCCCCPPPPPPFPPFFFHXXXXXXXXPAAARRRRAARRAAAAAAAAAYYYYYYYYYYYYYYHHHHWWLLLLLLMMMMMMMVVVVVVV
+AAAVVAAKBBIRIOOOOOOOOOVVVVVVVZLLLLUBUUUUUUUUUIIICCCCCCCCCCPPPPPPFFPFFFXXXXXXXXNAAAABRRAAAAAAAAAAAAAAAYYYYYYYYYYYYYHYYWWMLLLLLLNMMVMVVVVVVVVV
+AAAVVVBBBBRRIOOOOOOOOOVVVVVVVZSSLLLUUUUUUUUUUIIACCCCCCCCCCPPPPPPFFFFFFXXXXUXXNNAAABBRRKKAAAAAAAAAAAAAYSYYYYYYYYYYYYYYWWWLLLLLLNNMVVVVVVVVVVV
+AAAAAVBBBBRRIOOORROOOOOVVVVVVSSLLLUUUUUUUUUUCCCAAAPPPPPPPPPPPPPPPPFFFXXXXXXNNNNAAAAAAKKKKKKAAAAAAAAAAYSSYYYYYYYYYYYYYYWWLLLLLLNVVVVVVVVVVVVV
+AAAAABBPRRRRROGRROOOOOOVVVVJJSSSLLLUUUUUUUUUUCCAAAAPPPPPPPPPPFFFFFFFFXXXXXXXXNNAAAAAAKKKKKKAAAAAAAAAAYSZSYYYYYYYYYYYYYNNNNNNNNVVOOVVVVVVVVVV
+AAAAAPPPRRRRRBRRRROOOOOVVSFSSHSSSSLLUUUUUUUUUUMMMMMPPPPPLIIPPPFFFFFFFXXXXXXXXNNAAAAAKKKKLLAAAAAAAAAAAASSSZYYYYYYYYYYYYNNNNNNNNVVNOVVVVVVVVVV
+AAGGAPPRRRRRRRRRRROOOOOBVSFSSSSSSSLUUUUUUUUUUMMMMMMPPPPMIIIIIINNFFIFXXXXXXXXXNNAAAAAALLLLLGAAAAAAAAAAASSSZSSYYYYYYYYYNNNNNNNNNNNNVVVVVVVVVVV
+AAGGRPRRRRRRRRRRRGOOOOOOOSSSSSSSSSLLUUUUUUUUMMMMMMMPPPMMIIIIIIIIFFIIXXXXXXXXAOAAAAAAALLLLLLLAAAAAAASSSSSSSSSYDYYYYYYYYNNNNNNNNNOOOVVVVVVVVVV
+GGGGRRRRRRRRRRRRRRBBBBOOOSSSSSSSSSSLULUUUUUUUMMMMMMPPPMMMIIIIIIIIIIHOOOOOOOOOOXAAAAAAALLLLLCASADSASSSSSSIISSYDDDDDYYYYNNNNNNNNNOOOOOVVVVVVVV
+GGTTRRURRRRRRRRRRVVBBBAKSSSSSSSSSSLLLLUUUUUMMMMMMMMMPPMMIIIIIIIIIIIIOOOOOOOOOAAAAAAAAAALLLLAASSSSAASSSSSSSSSYDDDDNNMMYYNNNNNNNNNNOOOVVVVVVVV
+OOFTTTRRRRRRRRRRRVVBBBASSSSSSSSSSSSLSLUUUUUMMMMMMMMMMPMIIIIIIIOOOOOOOOOOOOOOOAAAAAAAAALLLLLTASSSSASSSSSSSSSUDDDDDNNNNNNNNNNNNNNNNOOOVOVVVVVV
+OOOTTTRRRRRRRRRRRVVVBBAAASSSSSSSSSSSSLLLUUUMMMMMMMMMMMMIIIIIIIOOOOOOOJJJJJOOOOAAAAALLLLLLLLTSSSSSSSSSSSSSSSUDDDDDDDDNNNNNNNNNNNNNNOOOOOOOVNN
+OOOOTRRRRRRRRRRRRVVVBBAAASSSSSSSSSSSSLLLUUMMMMMMMMMMMMMMMIIIIIOOOOOOOJJJJJOOOOOAAAAIIILLLLTTTTSDSSSSSSSSSSSDDDDDDDDDINDNNNNNONOOOOOOOOOOOVNN
+OOOORRRRRRRRRRRRRRVVAAAAASSSSSSSSSSSLLLLMMMMFMMOOMMMMMMMMIIOOOOOOOOOOJJJJJOOOZOAAAAIIILLLLLLTSSSSSSSSSSSSSSDDDDDDDDDDLNNQNNOOOOOOOOOOOOOOOOO
+OOORRRRRRRRRVVVRRVVVAAAAAAHSSSSSSSSSLLLLLMMMMMMOOOMMMMMMIIIOOOOOOOOOJJJJJJJZZZAAAAIIQLLLLLLLLLSSSSSSSSSSSSSDDDDDDDDLLLNNQQNOOOOOOOOOOOOOOOOO
+OORRRRRVRRRRVVVVVVVAAAAAAAASSSSSSSSSLLLLLLMMMMOOOOOOMMCCIIIOOOOOOOOOOOJJJJJJZAAAAAIQQLLLLLLLLOSSNNSSNNNSSSSDDDDDDDDLLLLNQQNLOOOOOOOOOOOOOOOH
+OORRMMVVRRRRVVVVVVVAAAAAAAASSSSSSSSSLLLLLLLLMLOOOOOOOMCCOIIOOOOOOOOOOOJJJJJZZAAAAAAAQLLLLLLLLOSSONSSNNNSSSSGGDDDDDLLGGGQQQOOOOOOOOOOOOOOOOHH
+RRRMMMMVVVVVVVVVVAAAAAAAAAASSSSKKHHHHKLLLLLLLLOOOOOOOMCCCCIOOOOOOOOOOOJJJJJJAAAAAAAAQQLLLLLLLOOOONNNNRRNONSSGDDDDDLLGGQQQQCOOOOOOOOOOOOOHHHH
+MMMMMMMMVVVVVVVVVVAAAAAAAAAAASSKKHHJJKLLLLLLLLOOOOOOOOCCCCKOOOOOOOOOOOJZZZJJJAAAAAAQQLLLLLLLLLOONNNNNNNNNNGGGDDDDGGGGGQQQCCCCOOOYOOOOOFHHHHH
+SSMMMMMMVVVVVVVVVAAAAAAAAAAASSSKKKHHKKLLLLLLOLOOOOOOOCCCCCCOOOOOOOOOOOZZZZZZFZZZZZZQQLLLLLLLLLOOONNNNNNNNGGGGGGDGGGGGGQQCCCCCOOOOOOOOFFHHHHH
+SMMMMMMMMMMVVVVVAAAAAAAAAAFAAKKKKKHKKKKKLLLOOOOOOOOOAACCCCCOOOOOOOOOJJJZZZZZZZZZZZZZQLLLLLLLLOOOONNNNNNNNGGGGGGDDGGGGGGCCCCCCCZZZOOOOFFFFHHH
+SSSMMMMMMMVVVVVVAAAAAAAAAAFIYIKKKKKKKKKKKKKOOOOOOOOOOACCCCCJJJJJJJJJJJZZZZZZZZZZZZZZLLLLLLLLLOOOONNNNNGGGGGGGGGGGGGGGGGGCCCCCZZHHOOFEFFFFFFF
+VSVVMMMMMMMVVVVVAAIAAIAIIIIIIIIKKKKKKKKKKKSSOOOOOOOOOACCCCJJMJJJJJJJJZZZZZZZZZZZZZZZSSSSSSSULOOOONNNNNGGGGGGGGGGGGGGGGGGCCCCCZHHHHFFFFFFFFVV
+VVVVMMMMMMMVVVVVAVIIIIIIIIIIIIKKKKKKKKKKKKSSOOKKKKOQUACCCJJJJJJJJJJJZZKZZZZZZZZZZZZSSSSSSSSOOOOOGGNNGGGGGGGGGGGGGGGGGGGCCCCHHZHHHHHFFFFFFFFV
+VVMMMMMMVVVVVVVVVVIIIIIIIIIIIKKKKKKKKKKKKKDDDDDKKUOUUUULLJJJJJJJJRRRRZZZZZZZZZZZZZZSSSSSSSSOOOOOGGNNGGGGGGGGGGGGGGGGGGCCCCCHHZHHHHHYHFFFFFFF
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2024/d13/ex1/ex1.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+
+import dataclasses
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+@dataclasses.dataclass
+class ClawMachine:
+    a_delta: Point
+    b_delta: Point
+    prize: Point
+
+
+def solve(input: str) -> int:
+    def parse_button(input: str) -> Point:
+        deltas = input.split(": ")[1].strip()
+        x, y = map(lambda delta: int(delta.split("+")[1]), deltas.split(", "))
+        return Point(x, y)
+
+    def parse_prize(input: str) -> Point:
+        coords = input.split(": ")[1].strip()
+        x, y = map(lambda delta: int(delta.split("=")[1]), coords.split(", "))
+        return Point(x, y)
+
+    def parse_claw_machine(input: list[str]) -> ClawMachine:
+        assert len(input) == 3  # Sanity check
+        return ClawMachine(
+            parse_button(input[0]),
+            parse_button(input[1]),
+            parse_prize(input[2]),
+        )
+
+    def parse(input: str) -> list[ClawMachine]:
+        return [parse_claw_machine(group.splitlines()) for group in input.split("\n\n")]
+
+    def play_machine(machine: ClawMachine) -> int | None:
+        def found_prize(row: list[tuple[int, Point]]) -> int | None:
+            for tokens, p in row:
+                if p == machine.prize:
+                    return tokens
+            return None
+
+        row = [
+            (3 * i, Point(machine.a_delta.x * i, machine.a_delta.y * i))
+            for i in range(101)
+        ]
+        res = found_prize(row)
+        for _ in range(100):
+            row = [
+                (tokens + 1, Point(p.x + machine.b_delta.x, p.y + machine.b_delta.y))
+                for tokens, p in row
+            ]
+            tmp = found_prize(row)
+            if tmp is None:
+                continue
+            if res is None:
+                res = tmp
+            res = min(res, tmp)
+        return res
+
+    claw_machines = parse(input)
+    return sum(
+        tokens for tokens in map(play_machine, claw_machines) if tokens is not None
+    )
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d13/ex2/ex2.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+
+import dataclasses
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+@dataclasses.dataclass
+class ClawMachine:
+    a_delta: Point
+    b_delta: Point
+    prize: Point
+
+
+def solve(input: str) -> int:
+    def parse_button(input: str) -> Point:
+        deltas = input.split(": ")[1].strip()
+        x, y = map(lambda delta: int(delta.split("+")[1]), deltas.split(", "))
+        return Point(x, y)
+
+    def parse_prize(input: str) -> Point:
+        coords = input.split(": ")[1].strip()
+        x, y = map(lambda delta: int(delta.split("=")[1]), coords.split(", "))
+        return Point(10000000000000 + x, 10000000000000 + y)
+
+    def parse_claw_machine(input: list[str]) -> ClawMachine:
+        assert len(input) == 3  # Sanity check
+        return ClawMachine(
+            parse_button(input[0]),
+            parse_button(input[1]),
+            parse_prize(input[2]),
+        )
+
+    def parse(input: str) -> list[ClawMachine]:
+        return [parse_claw_machine(group.splitlines()) for group in input.split("\n\n")]
+
+    def play_machine(machine: ClawMachine) -> int | None:
+        a_dx, a_dy = machine.a_delta
+        b_dx, b_dy = machine.b_delta
+        px, py = machine.prize
+
+        a = (px * b_dy - py * b_dx) // (b_dy * a_dx - b_dx * a_dy)
+        b = (px * a_dy - py * a_dx) // (a_dy * b_dx - a_dx * b_dy)
+
+        if a * a_dx + b * b_dx != px:
+            return None
+        if a * a_dy + b * b_dy != py:
+            return None
+
+        return 3 * a + b
+
+    claw_machines = parse(input)
+    return sum(
+        tokens for tokens in map(play_machine, claw_machines) if tokens is not None
+    )
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d14/ex1/ex1.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+import dataclasses
+import functools
+import operator
+import sys
+from collections import Counter
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+@dataclasses.dataclass
+class Robot:
+    pos: Point
+    vel: Point
+
+    def step(self, dims: Point, delta: int = 1) -> "Robot":
+        x, y = self.pos.x + self.vel.x * delta, self.pos.y + self.vel.y * delta
+        return Robot(
+            Point(x % dims.x, y % dims.y),
+            self.vel,
+        )
+
+
+def solve(input: str) -> int:
+    def parse_robot(input: str) -> Robot:
+        pos, vel = map(lambda s: s.split("=")[1], input.split(" "))
+        return Robot(
+            Point(*map(int, pos.split(","))),
+            Point(*map(int, vel.split(","))),
+        )
+
+    def parse(input: list[str]) -> list[Robot]:
+        return [parse_robot(line) for line in input]
+
+    def compute_safety(robots: list[Robot], dims: Point) -> int:
+        mid_x, mid_y = dims.x // 2, dims.y // 2
+        counts: Counter[tuple[bool, bool]] = Counter()
+        for x, y in map(lambda robot: robot.pos, robots):
+            if x == mid_x or y == mid_y:
+                continue
+            counts[(x < mid_x, y < mid_y)] += 1
+        return functools.reduce(operator.mul, counts.values())
+
+    robots = parse(input.splitlines())
+    dims = Point(101, 103)
+    robots = [robot.step(dims, 100) for robot in robots]
+    return compute_safety(robots, dims)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d14/ex1/input

@@ -0,0 +1,500 @@
+p=62,20 v=85,-14
+p=88,18 v=-70,97
+p=51,21 v=35,-22
+p=19,56 v=2,45
+p=93,11 v=-87,26
+p=90,67 v=44,-13
+p=99,34 v=82,57
+p=55,42 v=82,22
+p=61,22 v=-24,-95
+p=100,7 v=18,-29
+p=92,56 v=-56,66
+p=66,15 v=-6,77
+p=62,21 v=68,39
+p=8,80 v=-72,-90
+p=33,40 v=89,-46
+p=28,10 v=-4,-64
+p=4,78 v=-55,1
+p=87,23 v=-32,-10
+p=1,76 v=85,6
+p=15,51 v=-35,-75
+p=58,98 v=-41,80
+p=34,17 v=-25,-47
+p=66,81 v=23,50
+p=48,97 v=-53,88
+p=99,69 v=-97,83
+p=25,23 v=-38,31
+p=16,54 v=91,37
+p=12,65 v=-85,-41
+p=13,62 v=51,64
+p=54,16 v=-91,-30
+p=99,92 v=34,30
+p=44,21 v=-50,-9
+p=0,55 v=15,-46
+p=68,23 v=-53,-51
+p=29,51 v=24,-55
+p=42,10 v=-98,28
+p=76,50 v=-55,-54
+p=83,24 v=65,-70
+p=13,15 v=-85,64
+p=2,53 v=-43,-59
+p=8,88 v=-24,34
+p=100,50 v=33,-20
+p=24,83 v=17,54
+p=18,71 v=52,38
+p=93,21 v=-33,-18
+p=8,78 v=-19,-7
+p=23,31 v=61,-46
+p=76,60 v=47,46
+p=51,26 v=-53,32
+p=32,54 v=-76,33
+p=66,65 v=-42,62
+p=19,3 v=78,-23
+p=96,46 v=88,-76
+p=53,44 v=12,-13
+p=64,56 v=-30,64
+p=41,52 v=35,-24
+p=49,9 v=-28,35
+p=77,18 v=9,-43
+p=57,3 v=97,-97
+p=81,57 v=-23,27
+p=13,73 v=-22,-90
+p=97,76 v=-46,-49
+p=63,43 v=-80,99
+p=90,96 v=-37,-92
+p=89,33 v=82,-42
+p=79,64 v=-19,-58
+p=64,65 v=59,-90
+p=84,54 v=17,24
+p=95,42 v=18,-13
+p=90,43 v=-36,-62
+p=83,2 v=32,-97
+p=34,69 v=-38,-78
+p=91,17 v=18,31
+p=42,82 v=74,-94
+p=1,33 v=-72,-42
+p=97,82 v=-20,-94
+p=83,83 v=-23,40
+p=56,22 v=85,-22
+p=50,42 v=25,-70
+p=32,1 v=88,-60
+p=63,71 v=-3,-33
+p=49,85 v=-67,59
+p=18,8 v=-23,39
+p=24,60 v=-76,-87
+p=34,100 v=-88,-85
+p=84,84 v=44,79
+p=16,101 v=53,-64
+p=44,33 v=88,-25
+p=52,22 v=-43,-35
+p=30,63 v=-23,-86
+p=14,40 v=65,-50
+p=56,98 v=-41,88
+p=42,11 v=-14,-72
+p=72,9 v=-4,-72
+p=26,71 v=-47,-62
+p=92,18 v=-71,15
+p=81,40 v=59,7
+p=79,69 v=16,64
+p=4,40 v=24,-83
+p=17,78 v=65,-32
+p=87,85 v=81,-36
+p=98,27 v=42,42
+p=100,55 v=72,95
+p=94,12 v=-80,61
+p=73,34 v=96,-38
+p=32,30 v=-63,-38
+p=45,37 v=-27,-75
+p=6,0 v=-72,-68
+p=24,58 v=39,41
+p=25,74 v=-26,-15
+p=99,82 v=80,64
+p=88,54 v=-94,-21
+p=100,81 v=29,-28
+p=84,87 v=56,6
+p=71,17 v=-95,-96
+p=37,89 v=-9,-18
+p=42,30 v=-78,-59
+p=92,17 v=-68,14
+p=31,55 v=88,66
+p=28,10 v=-13,-62
+p=30,30 v=29,60
+p=89,80 v=8,-42
+p=23,75 v=41,-44
+p=65,78 v=-55,42
+p=1,80 v=-9,19
+p=54,78 v=36,83
+p=10,40 v=66,-95
+p=67,71 v=8,58
+p=23,17 v=12,69
+p=36,70 v=76,21
+p=7,63 v=-60,-65
+p=39,96 v=87,41
+p=8,56 v=-34,-90
+p=64,66 v=9,79
+p=2,61 v=4,17
+p=64,51 v=28,-6
+p=91,25 v=-41,69
+p=92,3 v=-85,47
+p=61,41 v=-90,57
+p=86,61 v=-69,70
+p=82,45 v=7,-13
+p=23,39 v=-78,-40
+p=58,3 v=-30,15
+p=87,30 v=87,-25
+p=21,84 v=39,34
+p=36,26 v=89,-59
+p=90,51 v=-83,-91
+p=5,39 v=79,-87
+p=5,63 v=66,-74
+p=71,45 v=21,-21
+p=49,40 v=-68,-66
+p=68,93 v=96,96
+p=67,96 v=46,51
+p=72,44 v=-32,82
+p=15,90 v=15,2
+p=26,78 v=28,-44
+p=7,3 v=-87,-39
+p=74,101 v=94,-76
+p=90,20 v=-6,-46
+p=22,17 v=-68,-63
+p=12,81 v=-37,14
+p=37,84 v=-15,22
+p=75,31 v=83,-63
+p=48,2 v=-90,-27
+p=44,94 v=-63,31
+p=73,71 v=-50,22
+p=22,101 v=39,51
+p=49,94 v=-90,26
+p=93,67 v=5,-12
+p=57,83 v=-68,80
+p=86,82 v=44,-32
+p=3,64 v=87,-62
+p=43,87 v=-20,-57
+p=40,18 v=-8,-56
+p=80,46 v=-89,57
+p=79,26 v=-18,27
+p=3,27 v=-98,77
+p=99,44 v=42,-99
+p=25,27 v=-72,23
+p=98,24 v=43,85
+p=54,93 v=-28,-60
+p=29,4 v=86,80
+p=42,96 v=-75,14
+p=75,77 v=54,81
+p=96,63 v=-46,-33
+p=51,94 v=88,-69
+p=31,88 v=51,39
+p=75,15 v=-43,-84
+p=8,18 v=93,63
+p=20,65 v=99,30
+p=71,5 v=72,-98
+p=31,95 v=63,-19
+p=87,70 v=-68,71
+p=11,55 v=15,37
+p=63,36 v=10,36
+p=41,98 v=37,10
+p=27,78 v=26,-36
+p=53,93 v=30,18
+p=78,25 v=-58,-80
+p=21,100 v=-73,66
+p=36,33 v=25,11
+p=65,3 v=-92,-68
+p=46,22 v=-64,48
+p=49,87 v=-91,38
+p=82,37 v=6,16
+p=24,94 v=-30,-3
+p=14,94 v=94,37
+p=28,32 v=39,-1
+p=35,19 v=-68,-25
+p=3,51 v=-47,70
+p=12,6 v=-29,-28
+p=28,19 v=15,2
+p=75,45 v=95,-67
+p=76,4 v=7,-93
+p=45,29 v=-63,-37
+p=41,22 v=-64,93
+p=67,45 v=10,-36
+p=51,1 v=21,-74
+p=25,84 v=1,-81
+p=15,36 v=-47,-29
+p=44,98 v=24,-81
+p=79,30 v=45,94
+p=45,57 v=12,-57
+p=12,23 v=65,78
+p=65,76 v=-68,17
+p=100,100 v=79,23
+p=75,22 v=58,-84
+p=82,65 v=69,-74
+p=76,6 v=-61,-61
+p=61,38 v=27,53
+p=68,94 v=86,37
+p=64,71 v=6,-88
+p=21,93 v=-53,-65
+p=32,86 v=64,-98
+p=11,11 v=-95,-95
+p=36,32 v=-38,65
+p=23,95 v=91,-65
+p=31,33 v=12,-34
+p=12,5 v=-99,-72
+p=50,3 v=-91,-93
+p=74,66 v=33,13
+p=22,7 v=-12,-97
+p=11,6 v=41,-43
+p=14,16 v=-21,60
+p=95,76 v=81,-61
+p=3,55 v=79,99
+p=43,97 v=-1,-60
+p=73,66 v=31,-33
+p=60,33 v=73,-57
+p=63,57 v=71,-95
+p=86,11 v=-20,-80
+p=50,28 v=86,-34
+p=66,5 v=-80,45
+p=96,87 v=67,6
+p=52,16 v=-53,40
+p=31,31 v=38,32
+p=96,23 v=-34,-72
+p=46,64 v=-91,45
+p=14,19 v=-73,60
+p=31,85 v=12,-32
+p=19,36 v=-36,-46
+p=39,21 v=-52,15
+p=98,34 v=-10,81
+p=96,65 v=-9,1
+p=97,75 v=-21,34
+p=22,0 v=64,2
+p=8,15 v=-24,36
+p=67,1 v=61,-89
+p=64,76 v=70,34
+p=22,29 v=-74,-54
+p=73,48 v=-41,-75
+p=83,7 v=-82,-72
+p=57,6 v=-66,-93
+p=31,21 v=-50,81
+p=90,21 v=-56,-35
+p=79,73 v=54,77
+p=62,64 v=60,29
+p=51,70 v=-96,-6
+p=35,71 v=75,-33
+p=9,56 v=53,-58
+p=63,48 v=-94,49
+p=61,72 v=82,55
+p=51,79 v=-66,5
+p=2,62 v=46,-46
+p=56,2 v=10,-64
+p=42,74 v=-64,75
+p=0,83 v=17,-61
+p=3,59 v=-97,33
+p=40,82 v=-15,47
+p=89,8 v=94,19
+p=76,26 v=-95,-23
+p=4,86 v=79,76
+p=4,32 v=-77,31
+p=35,38 v=-9,-59
+p=78,87 v=72,-57
+p=72,72 v=-72,67
+p=94,33 v=-2,-93
+p=59,96 v=37,-19
+p=90,24 v=-83,-1
+p=88,61 v=69,50
+p=67,28 v=35,-66
+p=40,63 v=75,29
+p=84,27 v=-42,-91
+p=40,21 v=-31,-30
+p=1,50 v=-34,-95
+p=87,59 v=96,-94
+p=36,19 v=-78,-68
+p=5,43 v=-78,91
+p=27,49 v=91,-99
+p=61,85 v=11,14
+p=89,61 v=-83,-97
+p=31,78 v=-86,81
+p=76,69 v=33,-82
+p=74,28 v=-43,-71
+p=23,27 v=-35,86
+p=80,74 v=-33,-86
+p=99,10 v=43,-10
+p=59,55 v=-41,-95
+p=89,94 v=58,43
+p=72,87 v=7,67
+p=68,73 v=-29,-57
+p=1,46 v=80,41
+p=45,33 v=36,-38
+p=24,4 v=46,21
+p=18,94 v=-35,5
+p=82,45 v=53,74
+p=93,75 v=-83,-86
+p=14,3 v=51,-80
+p=74,30 v=-30,-96
+p=70,38 v=-29,-34
+p=55,76 v=-94,-13
+p=11,82 v=-10,38
+p=11,55 v=-35,-4
+p=93,76 v=6,-57
+p=17,57 v=-80,-42
+p=47,82 v=18,94
+p=84,70 v=-84,1
+p=48,94 v=-90,6
+p=95,41 v=-51,57
+p=18,53 v=55,-84
+p=100,20 v=-20,-56
+p=49,26 v=-17,34
+p=31,62 v=92,-86
+p=69,2 v=-81,82
+p=76,43 v=-71,97
+p=23,15 v=-62,97
+p=26,23 v=-87,40
+p=67,48 v=34,16
+p=64,11 v=-54,85
+p=85,58 v=8,-49
+p=80,25 v=57,-6
+p=45,35 v=49,-9
+p=96,65 v=-20,-25
+p=91,49 v=68,16
+p=8,62 v=29,33
+p=97,50 v=69,-85
+p=52,53 v=-2,70
+p=70,68 v=44,83
+p=65,7 v=-17,39
+p=45,14 v=-87,-34
+p=94,47 v=-93,-46
+p=29,84 v=70,11
+p=70,73 v=-23,-6
+p=100,51 v=45,18
+p=21,2 v=-13,-19
+p=67,32 v=-95,-82
+p=61,2 v=-54,64
+p=17,12 v=65,35
+p=67,54 v=-74,-89
+p=2,6 v=5,-92
+p=26,77 v=-12,-28
+p=39,77 v=12,-86
+p=70,57 v=84,-83
+p=8,88 v=-60,13
+p=19,37 v=-38,-89
+p=0,14 v=6,-2
+p=24,59 v=-24,-82
+p=5,13 v=-11,-47
+p=21,27 v=88,23
+p=89,75 v=-20,83
+p=68,66 v=19,1
+p=34,72 v=-74,25
+p=27,70 v=14,-90
+p=89,9 v=-44,2
+p=5,67 v=-61,-36
+p=52,13 v=-53,-84
+p=50,21 v=-90,-9
+p=21,16 v=2,64
+p=69,21 v=-18,-88
+p=64,85 v=-80,34
+p=31,70 v=50,95
+p=15,8 v=-23,52
+p=97,52 v=28,41
+p=85,6 v=8,-15
+p=9,33 v=-74,52
+p=46,59 v=90,96
+p=71,50 v=-93,98
+p=15,74 v=-24,-82
+p=54,87 v=-15,-36
+p=37,25 v=-15,7
+p=92,13 v=86,78
+p=90,14 v=20,-68
+p=68,37 v=-5,4
+p=58,56 v=48,-99
+p=27,16 v=-36,-32
+p=4,49 v=-58,65
+p=5,50 v=-60,98
+p=13,31 v=-48,-91
+p=58,75 v=46,8
+p=66,88 v=-6,-98
+p=95,16 v=32,23
+p=86,21 v=-57,-55
+p=19,65 v=-32,-98
+p=83,57 v=-46,-95
+p=37,10 v=38,64
+p=87,33 v=46,8
+p=45,54 v=-53,-58
+p=35,95 v=-39,-7
+p=89,65 v=58,-45
+p=82,80 v=-82,-65
+p=35,7 v=25,76
+p=66,92 v=-16,-44
+p=75,89 v=-92,66
+p=48,84 v=98,42
+p=70,84 v=-30,-44
+p=49,51 v=-92,28
+p=27,85 v=62,-36
+p=31,21 v=3,-64
+p=61,101 v=-15,88
+p=56,44 v=90,68
+p=83,49 v=-95,-83
+p=69,38 v=8,-92
+p=34,13 v=-32,43
+p=0,51 v=-75,25
+p=39,36 v=76,69
+p=66,59 v=70,-96
+p=78,42 v=-31,-62
+p=5,5 v=-33,-22
+p=54,74 v=-12,44
+p=25,26 v=25,85
+p=74,88 v=-39,56
+p=65,83 v=33,-28
+p=87,90 v=95,30
+p=71,20 v=-29,93
+p=66,9 v=83,-96
+p=38,51 v=50,41
+p=66,87 v=44,46
+p=30,31 v=-49,-14
+p=70,32 v=73,28
+p=0,94 v=95,26
+p=87,80 v=-83,46
+p=92,70 v=-58,99
+p=48,67 v=-1,41
+p=43,74 v=49,34
+p=87,51 v=43,8
+p=23,63 v=39,-86
+p=2,77 v=48,7
+p=32,60 v=-63,-37
+p=99,3 v=-21,31
+p=82,55 v=57,8
+p=5,68 v=-46,-41
+p=32,77 v=-38,88
+p=84,0 v=6,-64
+p=20,95 v=52,26
+p=29,98 v=-16,83
+p=44,81 v=-27,-73
+p=43,40 v=-41,-42
+p=24,73 v=-88,-49
+p=99,45 v=-97,8
+p=37,9 v=-31,-57
+p=70,11 v=8,-39
+p=0,11 v=96,57
+p=83,70 v=70,75
+p=65,71 v=-40,-65
+p=82,66 v=73,-80
+p=31,41 v=52,-96
+p=19,72 v=65,75
+p=24,4 v=-86,54
+p=75,85 v=85,30
+p=2,83 v=17,-7
+p=9,87 v=-22,59
+p=24,3 v=-12,21
+p=5,74 v=-34,46
+p=22,90 v=-37,-11
+p=20,84 v=4,95
+p=95,10 v=-96,-55
+p=52,9 v=23,-14
+p=20,51 v=-63,-75
+p=64,27 v=24,48
+p=50,2 v=-90,-68
+p=54,47 v=23,70
+p=26,22 v=51,-51
+p=4,49 v=-72,-54
+p=53,47 v=2,-86
+p=21,29 v=-37,13
+p=37,70 v=38,-40
+p=6,41 v=43,-20
+p=88,23 v=-38,-68
+p=67,20 v=79,-71
+p=37,7 v=24,25

2024/d14/ex2/ex2.py

@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+
+import dataclasses
+import functools
+import itertools
+import sys
+from typing import Literal, NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+@dataclasses.dataclass
+class Robot:
+    pos: Point
+    vel: Point
+
+    def step(self, dims: Point, delta: int = 1) -> "Robot":
+        x, y = self.pos.x + self.vel.x * delta, self.pos.y + self.vel.y * delta
+        return Robot(
+            Point(x % dims.x, y % dims.y),
+            self.vel,
+        )
+
+
+def solve(input: str) -> int:
+    def parse_robot(input: str) -> Robot:
+        pos, vel = map(lambda s: s.split("=")[1], input.split(" "))
+        return Robot(
+            Point(*map(int, pos.split(","))),
+            Point(*map(int, vel.split(","))),
+        )
+
+    def parse(input: list[str]) -> list[Robot]:
+        return [parse_robot(line) for line in input]
+
+    def find_tree(robots: list[Robot], dims: Point) -> int:
+        def compute_positions(step: int) -> list[Point]:
+            return [robot.step(dims, step).pos for robot in robots]
+
+        def compute_variance(values: list[int]) -> float:
+            avg = sum(values) / len(values)
+            variance = sum((n - avg) ** 2 for n in values) / len(values)
+            return variance
+
+        def cluster_variance(step: int, dimension: Literal["x", "y"]) -> float:
+            return compute_variance(
+                [getattr(p, dimension) for p in compute_positions(step)]
+            )
+
+        # The tree should have robots clustered together in X and Y
+        cluster_x = min(
+            range(dims.x),
+            key=functools.partial(cluster_variance, dimension="x"),
+        )
+        cluster_y = min(
+            range(dims.y),
+            key=functools.partial(cluster_variance, dimension="y"),
+        )
+
+        # And those clusers should repeat modulo each dimension
+        for i in itertools.count(cluster_x, step=dims.x):
+            if i % dims.y == cluster_y:
+                return i
+        assert False  # Sanity check
+
+    robots = parse(input.splitlines())
+    dims = Point(101, 103)
+    return find_tree(robots, dims)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d14/ex2/input

@@ -0,0 +1,500 @@
+p=62,20 v=85,-14
+p=88,18 v=-70,97
+p=51,21 v=35,-22
+p=19,56 v=2,45
+p=93,11 v=-87,26
+p=90,67 v=44,-13
+p=99,34 v=82,57
+p=55,42 v=82,22
+p=61,22 v=-24,-95
+p=100,7 v=18,-29
+p=92,56 v=-56,66
+p=66,15 v=-6,77
+p=62,21 v=68,39
+p=8,80 v=-72,-90
+p=33,40 v=89,-46
+p=28,10 v=-4,-64
+p=4,78 v=-55,1
+p=87,23 v=-32,-10
+p=1,76 v=85,6
+p=15,51 v=-35,-75
+p=58,98 v=-41,80
+p=34,17 v=-25,-47
+p=66,81 v=23,50
+p=48,97 v=-53,88
+p=99,69 v=-97,83
+p=25,23 v=-38,31
+p=16,54 v=91,37
+p=12,65 v=-85,-41
+p=13,62 v=51,64
+p=54,16 v=-91,-30
+p=99,92 v=34,30
+p=44,21 v=-50,-9
+p=0,55 v=15,-46
+p=68,23 v=-53,-51
+p=29,51 v=24,-55
+p=42,10 v=-98,28
+p=76,50 v=-55,-54
+p=83,24 v=65,-70
+p=13,15 v=-85,64
+p=2,53 v=-43,-59
+p=8,88 v=-24,34
+p=100,50 v=33,-20
+p=24,83 v=17,54
+p=18,71 v=52,38
+p=93,21 v=-33,-18
+p=8,78 v=-19,-7
+p=23,31 v=61,-46
+p=76,60 v=47,46
+p=51,26 v=-53,32
+p=32,54 v=-76,33
+p=66,65 v=-42,62
+p=19,3 v=78,-23
+p=96,46 v=88,-76
+p=53,44 v=12,-13
+p=64,56 v=-30,64
+p=41,52 v=35,-24
+p=49,9 v=-28,35
+p=77,18 v=9,-43
+p=57,3 v=97,-97
+p=81,57 v=-23,27
+p=13,73 v=-22,-90
+p=97,76 v=-46,-49
+p=63,43 v=-80,99
+p=90,96 v=-37,-92
+p=89,33 v=82,-42
+p=79,64 v=-19,-58
+p=64,65 v=59,-90
+p=84,54 v=17,24
+p=95,42 v=18,-13
+p=90,43 v=-36,-62
+p=83,2 v=32,-97
+p=34,69 v=-38,-78
+p=91,17 v=18,31
+p=42,82 v=74,-94
+p=1,33 v=-72,-42
+p=97,82 v=-20,-94
+p=83,83 v=-23,40
+p=56,22 v=85,-22
+p=50,42 v=25,-70
+p=32,1 v=88,-60
+p=63,71 v=-3,-33
+p=49,85 v=-67,59
+p=18,8 v=-23,39
+p=24,60 v=-76,-87
+p=34,100 v=-88,-85
+p=84,84 v=44,79
+p=16,101 v=53,-64
+p=44,33 v=88,-25
+p=52,22 v=-43,-35
+p=30,63 v=-23,-86
+p=14,40 v=65,-50
+p=56,98 v=-41,88
+p=42,11 v=-14,-72
+p=72,9 v=-4,-72
+p=26,71 v=-47,-62
+p=92,18 v=-71,15
+p=81,40 v=59,7
+p=79,69 v=16,64
+p=4,40 v=24,-83
+p=17,78 v=65,-32
+p=87,85 v=81,-36
+p=98,27 v=42,42
+p=100,55 v=72,95
+p=94,12 v=-80,61
+p=73,34 v=96,-38
+p=32,30 v=-63,-38
+p=45,37 v=-27,-75
+p=6,0 v=-72,-68
+p=24,58 v=39,41
+p=25,74 v=-26,-15
+p=99,82 v=80,64
+p=88,54 v=-94,-21
+p=100,81 v=29,-28
+p=84,87 v=56,6
+p=71,17 v=-95,-96
+p=37,89 v=-9,-18
+p=42,30 v=-78,-59
+p=92,17 v=-68,14
+p=31,55 v=88,66
+p=28,10 v=-13,-62
+p=30,30 v=29,60
+p=89,80 v=8,-42
+p=23,75 v=41,-44
+p=65,78 v=-55,42
+p=1,80 v=-9,19
+p=54,78 v=36,83
+p=10,40 v=66,-95
+p=67,71 v=8,58
+p=23,17 v=12,69
+p=36,70 v=76,21
+p=7,63 v=-60,-65
+p=39,96 v=87,41
+p=8,56 v=-34,-90
+p=64,66 v=9,79
+p=2,61 v=4,17
+p=64,51 v=28,-6
+p=91,25 v=-41,69
+p=92,3 v=-85,47
+p=61,41 v=-90,57
+p=86,61 v=-69,70
+p=82,45 v=7,-13
+p=23,39 v=-78,-40
+p=58,3 v=-30,15
+p=87,30 v=87,-25
+p=21,84 v=39,34
+p=36,26 v=89,-59
+p=90,51 v=-83,-91
+p=5,39 v=79,-87
+p=5,63 v=66,-74
+p=71,45 v=21,-21
+p=49,40 v=-68,-66
+p=68,93 v=96,96
+p=67,96 v=46,51
+p=72,44 v=-32,82
+p=15,90 v=15,2
+p=26,78 v=28,-44
+p=7,3 v=-87,-39
+p=74,101 v=94,-76
+p=90,20 v=-6,-46
+p=22,17 v=-68,-63
+p=12,81 v=-37,14
+p=37,84 v=-15,22
+p=75,31 v=83,-63
+p=48,2 v=-90,-27
+p=44,94 v=-63,31
+p=73,71 v=-50,22
+p=22,101 v=39,51
+p=49,94 v=-90,26
+p=93,67 v=5,-12
+p=57,83 v=-68,80
+p=86,82 v=44,-32
+p=3,64 v=87,-62
+p=43,87 v=-20,-57
+p=40,18 v=-8,-56
+p=80,46 v=-89,57
+p=79,26 v=-18,27
+p=3,27 v=-98,77
+p=99,44 v=42,-99
+p=25,27 v=-72,23
+p=98,24 v=43,85
+p=54,93 v=-28,-60
+p=29,4 v=86,80
+p=42,96 v=-75,14
+p=75,77 v=54,81
+p=96,63 v=-46,-33
+p=51,94 v=88,-69
+p=31,88 v=51,39
+p=75,15 v=-43,-84
+p=8,18 v=93,63
+p=20,65 v=99,30
+p=71,5 v=72,-98
+p=31,95 v=63,-19
+p=87,70 v=-68,71
+p=11,55 v=15,37
+p=63,36 v=10,36
+p=41,98 v=37,10
+p=27,78 v=26,-36
+p=53,93 v=30,18
+p=78,25 v=-58,-80
+p=21,100 v=-73,66
+p=36,33 v=25,11
+p=65,3 v=-92,-68
+p=46,22 v=-64,48
+p=49,87 v=-91,38
+p=82,37 v=6,16
+p=24,94 v=-30,-3
+p=14,94 v=94,37
+p=28,32 v=39,-1
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+p=61,72 v=82,55
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+p=88,61 v=69,50
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+p=61,101 v=-15,88
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+p=5,74 v=-34,46
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+p=52,9 v=23,-14
+p=20,51 v=-63,-75
+p=64,27 v=24,48
+p=50,2 v=-90,-68
+p=54,47 v=23,70
+p=26,22 v=51,-51
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+p=21,29 v=-37,13
+p=37,70 v=38,-40
+p=6,41 v=43,-20
+p=88,23 v=-38,-68
+p=67,20 v=79,-71
+p=37,7 v=24,25

2024/d15/ex1/ex1.py

@@ -0,0 +1,103 @@
+#!/usr/bin/env python
+
+import copy
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.StrEnum):
+    UP = "^"
+    RIGHT = ">"
+    DOWN = "v"
+    LEFT = "<"
+
+    def step(self, p: Point) -> Point:
+        dx: int
+        dy: int
+
+        match self:
+            case Direction.UP:
+                dx, dy = -1, 0
+            case Direction.RIGHT:
+                dx, dy = 0, 1
+            case Direction.DOWN:
+                dx, dy = 1, 0
+            case Direction.LEFT:
+                dx, dy = 0, -1
+
+        return Point(p.x + dx, p.y + dy)
+
+
+class Object(enum.StrEnum):
+    BOX = "O"
+    WALL = "#"
+
+
+Maze = dict[Point, Object]
+
+
+def solve(input: str) -> int:
+    def parse_maze(input: list[str]) -> tuple[Point, Maze]:
+        robot: Point | None = None
+        maze: Maze = {}
+        for x, line in enumerate(input):
+            for y, c in enumerate(line):
+                if c == ".":
+                    continue
+                if c == "@":
+                    robot = Point(x, y)
+                    continue
+                maze[Point(x, y)] = Object(c)
+
+        assert robot is not None  # Sanity check
+        return robot, maze
+
+    def parse_directions(input: str) -> list[Direction]:
+        return [Direction(c) for c in input if c in Direction]
+
+    def parse(input: str) -> tuple[Point, Maze, list[Direction]]:
+        maze_input, directions_input = input.split("\n\n")
+        robot, maze = parse_maze(maze_input.splitlines())
+        directions = parse_directions(directions_input)
+        return robot, maze, directions
+
+    def step(robot: Point, maze: Maze, d: Direction) -> tuple[Point, Maze]:
+        # Maze a tentative step
+        new_robot = d.step(robot)
+        new_maze = copy.copy(maze)
+        # Try to move boxes along
+        if (blocker := new_robot) in new_maze:
+            # Try to move boxes up
+            while blocker in new_maze:
+                # We hit a wall, abort the movement
+                if new_maze[blocker] == Object.WALL:
+                    return robot, maze
+                # Otherwise look at the next space along
+                blocker = d.step(blocker)
+            # Out of the loop, we must have found an empty space, so do the push
+            new_maze[blocker] = new_maze.pop(new_robot)
+        # Robot moved without hitting a wall
+        return new_robot, new_maze
+
+    def compute_coordinates(maze: Maze) -> int:
+        return sum(100 * p.x + p.y for p, obj in maze.items() if obj == Object.BOX)
+
+    robot, maze, directions = parse(input)
+    for d in directions:
+        robot, maze = step(robot, maze, d)
+    return compute_coordinates(maze)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d15/ex1/input

@@ -0,0 +1,71 @@
+##################################################
+#......O.O..O......O......O..OO...O..O.O.O..O..O.#
+#....O.O..#.O....O#.#.#......O.O#O.O#O#..O.O.....#
+#.........O..#O......O...OO..O..O..O#....O.......#
+#.O.O......O#.#..#.#.........O...OOO.O..O..O....O#
+#..O......O.......O..O.#O......OO.O.O#..O.OO..O..#
+#O.O.....O.O......O....O..OO...#.#...O##OO#O.....#
+#O..O....OOOO...#.O.O.O#.....##.....O#.##..O.....#
+#O..O.O....O.#..O.O.OO#O.#..#.O....O..O.#.....O..#
+##..OOOO..O..#O.#.O....O...............OO.....O..#
+#O.O#.........OO..O..#..O.....O..O...O#.....O....#
+#..#O#O#...#....O...OOOO..O.....#O.......O.......#
+#..........O...O.....#OOOO#O..#..O..#O.........O.#
+##..O.OO.O......#...#OOO.OO..O.O.O.OO#.#OO..O.OO.#
+#....O.O..OO.O.OOO..OO...O...O..O.O.O....O...O...#
+#O..#OO.........O#......OOO....O.....O.OO.#.O.##.#
+#.O.OOO.....O....O...#O.O.O.#.O.O..........O...OO#
+#.OO.OO...O...O..#........O.O...O.O...#OO.O....O.#
+#OO...O.OO.#O.....OOO.#O#.O.#......OO.....OO#..O.#
+#..O......O.....#...#O.....O.....OOO.....O.#OO...#
+#.....#O..O..#...OOO.#O.O..O.O#...#OO.O......O..##
+#..OO.OOO#.O.....OO..#.OO......OO.O....O...O.....#
+#.O.OO..............#..O.....O.O...OO.....#.O#...#
+#......OO.....OOO.O..O#OO...OO..O#..O..O.OO......#
+#.#O....O....O..#O..O..O@..#..#...#......O.......#
+#.#..O.O.OO...O.O#....O..#..O...OOOOO...#.OOO#...#
+##O..O.O....#O....OO#O.#O......O.....O..O...#O...#
+#...O...........O.#O..O.#...#.O.O.O...........#.##
+#O#O.......O..O.....OO.#O.O.#OOOO#.O.O.O.O.......#
+##O.O..OO...#.O..#.O.O..OOO.O.O#.....O.O..#.O.O.O#
+#..OO...O..#O.O.#.OOO.....OO........#..OO.#...O.##
+#O.#.#..#.O.O...O..O.#O..O.O.OO......O.OO.O...O.##
+#.O.OO...OO.........#....O.OO.OO..O#O.#O........##
+#.......O.......OO#...#....#.OOO#.#........#.O...#
+#...O.O.#.O.O.........OOO.O.O...O....O....#...O#.#
+#....O.O.......#.......#..O##.O.O.....O...O.O...O#
+#.O.O.O..O#.O.O...##O#O...O.....#OO#O.O....O..O..#
+#O.O.O.#..O...O.O.......#.OO..#..........O...O.O.#
+#...O...O.....O....##......#..OO....##.O..OO.....#
+#..OO..O..O..OOO.....#O..OO.O.OOOO.#.O...O.#.....#
+#...O...O.O.O...O.#O.#.O...O#.#......O..OO..O.##O#
+#...O.O#......OO.#.O.....OO..O.......#...#.O...#.#
+##OO..#O.....OO..............#...O#..O#......OOO.#
+##OOOO..O.#..O.O....O....O..O#.O#....O....O.O....#
+#.....#......O...OOO.O........O....#O.OO.....OO.O#
+#O.#....OO#....OO.O....#O#........#.#.OO.#.O...OO#
+#.O.....O.OO.....OO...#O..OOO.O...OO....O.O##O...#
+##O..OO.OO..#..O.O.O.##O......O..#....OOO....OO..#
+#O..O....O.........OO#.#......OO...##.O.......O..#
+##################################################
+
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+vv^<^^v>^<<^v>vvv<v<v^v^><<<v>^>^vvv>v>>>^<>^vvvvvvvv^<<>^>><v^^>v><v<>v^v><>>>>v><vv>^v<><vvv^vv^><>vv><<>>>v<v<<>vv>^v^>>^vv>vv^><^<><v^^v<v>v>^^>v>>>>v>v>^v^<>v>>v^><>>^<<>v><^^v>^^^vv^<^>^>>v^<^v>^v><>^<^^^^<>vv^^v^^^>^^><vv^^vv>^vv^<>>^<<>^v<v<<^vv<<>^^<^><>v<>^^v^^>vv<<v<>^<v>^<^^<>^><vv<><<>vv^^v^><>vv<<^^>>v>vv>^vv<v<<v<v>>^<^^<v^<^>^><>v>v>v>>>^v<>^^<^>v<v>>^v>>^v>>^^^v>^vvv^^v<>^<>^<^v<^<v>vv^<^<<^v><^vv><^^>vvvv<<<<>^>^>>^v>>><>><<v^^vv^^vv^<><>^>v^>^<^><<v^v<<^>><vv<><v>v^<vv^><^^^>v^><^^^<v<v>v^<>><<v>^<<^>v^<v^>^>>^vvv>>>v^v^<v>^<v<><<<>^v^^<v^vvv^^^>vv^v<^<v>v<vv^>^<<^^v^v^<v>vv><<>>v^<<vv>>>v^<>v^<>v<v<>^<>^v<>>^>>^<^v^>v^>^v<^^v<<v>>><>v>v<v^v>^^v^<^v^<>^^>>>v><>v<<<<^v>v>>^^<^>^<^<v<^<^>>^^>^<>v^><<^^v^<vv^><><><<^v<>v<><><vv^<>>^><>>vvv^<^^^^>^v<>v<^v<v><v><>><^<<<><>^^<>>^vv>>>v><^<^>><v^^>v><<><^><v<^v><>vv^v^^^^<^v<v>>^>>vv>v>>^^v<vvv^>^>v^>^<>v^vvv^^^<^vv^v^v>>vv^><^<^>>vv<^<vvv^>v^<<v><v<>^^vvvv>v>^^v^>>vv^^^<^>v<<<>^>v<>v^vv^><v^^>vv<>v>v^v>><^<><>v>>v>>^><v<^<
+v<vvvv<^>>v^v^>^<>>><v><><>v<^^v>v<>vv>^<><>^^v><<^v<>^<^>>^<>><<v>v^<>v>^<v>v<v<v<<>^<^v>>v<>^^<^<<^v<<>vv>v<<^<v>^v><v^^v>^^<^>>>v^<v^^v<^v<<v>v<v^<^^v<vvv>^><>v>^<v<<>^<vvv<vvvv^>^v>vv^^^><^>v>v<<^vv^<^^>^^vv^v<<^<<>>^>^v^v<v><><^v>v^v^<<^<v>^^<>^<^>^><><<>^>^^v^v<<><>v<>v^v>v<^<>^vv^^^vvv<v^>>>vvv>>v^>>>^^<^^><<>^v<>>^<^v^<><><vv^>^>^<^^>v>>^^v^vv^>>vv^^v><<v>><v<<<<>v<<<>>v<v^^v^^^^v>^vv>><>^>>>>><v<>>v<v^<vv<v>><<<^v>>>vv>v^<^<<^<v^>v^<>^^^<>>v<v<v<><>v>v<><>v<<v><^<>v^><>^vv<v^^<<<>^>>vv^^>^^<^<><vv<><^^><v<^v<>^>>><>^><vvv><^<<v^<>v^v<><<<^^>><<><v^<^vvv^v>><^^^><v^vvv>^v><^<<v^>^>v<v>>vv>^<^vv<<>v^<v>>^^^>^<<<^<v^>^^v<vvv^^>^<<^>><><v^vvv><><^^<<^<>^<>^v^v<<>^>^>>vv<v>>v>>v<vv<vv<v<^<v^v<<<^^>^v<<><>v^>vv<<vv^^^<>><v>^v>v<<vv<<^v^<^^^vv><vv^^^^^^vv<<>^v^vv>>><>^<>><<>>v>v^>>v>>v<<>v>^^v^^^<^v^^v>v>^>>v>><<v><^>><^<^>^>^<v^v^<<^>^v^<>^>v<>>^<>vv>v^<v<<vv><<v^v<<><<><vv><^>>v^><^v>^><<^>>><>>^<v><v^>v>v>>>>>vv<vvv<<>v>^^>v^^>v<v>^<^^<^>>^^>v><<v<<>^><^^><v>^^>>v<><^>v<v<><<>^v>v
+>vv>>>>v><<^v>^^vvvvv><^v<>^<<>^^<^vv^>^<^^<>^vv<<^<v>^v<^<><<v><<^<v<<<v<<vv^v<v^>^v<>><<^<<><<<>^vv<v><v<>^<^><>vv>v^v<v><^v<vv>^>^^^v>^^<<^v>v>^<<^^^v<v>v^<<^<<<>>>^>^v><<>v>^<^<<^vv>><<^<^^><<>^v<^^><vv^>><v><<v^v<<<><v>^<^<vv^>v<>>^vvv^^v>^v^^v>^>^^^^<>><vv>vv>>>vv<<^vv<>>><v><<^^<><<<>>^^^v>^v>v<^<^v^^<<^<^vv<<<<<<vv<^>v^vv^>v>v^<^^<vv<>^><v^^^v^>^><<^<^>^<<^<<>><v>^<^>^^><^v^^^^v>>v<>^^<><^<^^><>vv>>><vv<^<>^v>>vv>^^><vvv>v<>^>>>>>><<<^<>>^<^>^<^<v>v^v^^v^^^>>^<<>v>>v>>>v^<<v^><v>^>v>v>^>vvv<<<>v<^<>v<>>>^<v><<^<v><v>>vv>>><^v^<<<<<^v<^^vv>^vvv<^v>v^^<^^v>>^<<<>^>>^^>^>>>>^v>v^<^^><>v<<<<^<v>v>^>^>>v><<^^^>v>><vv>^><>>^vv^^^<^<>v^^<>^v>^<>>^^v^>^^^v<><v^>>^><<>^^>>v<>>^<>vvvv>>>^vvv>^vv><><>v^v<v<^vv^v<>>v>>vv><<<>vv<^v>v>^v><v^<<^^^^v<^<>^<><v>^>v<<^v^<v<^<vv>v^^v>^<<<>^v<v<^v^<v^<^^v^^>>v>v>v>^^v<<v>^v>v^>^<v>>^^<>^>^><^<><>^>v>^>><^^^vv^<><<<<^>>>><^^^>vv><^<>>><<v><^v>v<<^v^vv>><>v<><^v>v^v>><v<^^^^>^>v>v<>^^<>vv>>v><<>v>><^<^v<<^>vvvv<<v<<^^<v<^^<>>^v<>^^v<>^^>v<<<>>^^>vvv<
+>^v^v^>>vv><<^<>v>v^v^><<<>v<<^v<v<>v^^<^>^>^vv<<>v^>>^>v<^>^v>^<>v>v^><v><>>^<v<^>>v^<v^v^^^^v<<^>>>^>>><>v^v^>^>>vv^<^>v<>>v^^>>^><<<<^>>v><<<vvv>><^v^^><>v>vv^>v<<<<^^>>>><^>^>>>>^v<<><^^v^<v><^>>>>^>>v><^<><>>>>v><v>v>>>>v^^<v>>^v<<v<<>>^<v^<>>>^<<>>v>^><>v^^>^<<><^<>>>>v<vv^^v^v>^v^v>^><^<^v^v<^v^^>^^>><v><^>^>^>>^^>>^<>vv>><>v><^>>v<<^><<^<^>v^<v>vv>v^v^^>^>>v><^<>v^><>>>^^v>v^^>>>^v<><<<<<^v^><^>>^^vv^>><^<v>v><<v^><^>^>v<^^v^vv<<^>^<>^<v><v>v^vv^<>v<vv^vv>v>^><v>>vv>>^^>^<v<<v<<^^vvv<v<v<<<<<v>^^<>^v^><v>vv>^^^v^<<>^><v<<<<>^><vv^vvv^<<^vv><v^^<<<^<>><v<<^>vv>^^>v<<v>vvvv^<<<<<v>^^>^<>v><^<>v^>^<<>v^>><>>>^^<v>^<>v^>>>^^>><^<v><^<<>^<<<v>v^><<^v<v<><v^<^<><v^^<v^vv^>v^<v<v^><><<vv<>^v<<<^vv<>v^>^^v>><<<v<><vv><<v>^<v^^<>^<>vv<<v<<<><v><<v^^<v^><>^^^^v^vv^<>v>>>>v<>>><v>v>v>^>v^v>vvv^<<<>^^v>vv<v<v<><<>>^<>v<vv>>>^<<>^<v^>><v<v^vv>^^<<^v^v<<<<<<^>^^<<>v<<><<<^v><<<v^<^<v^><v<>>><>^><^<><vvv^v>v<^v><v>>vv<<>v^v<<^<^>^>^v<v<<v<v>><v^<^<^v>v<<<>^>^<>^<v^<v^v^v>^^^v^vv^v>^>vv><^<<>>
+^v><>v<^^^<>>>><>>>^v<vv<<^^<><<^<^>v>>^<<v>><v<<>><^>>v^v^^>v^>v^><^<vv^>><v<>v>vvv<<>v><^vvv>^^vv^<^>><v<>^vvv>^^^>^v^^vv^v^<>^^<>^<v>^^<<v>><<^^<<^<<<>^>v<v^<>>^>^v^^<>^><vvv^<vv<>v<^<vv><^^v<<<vv>^^^>v^^<v^^>v>><<<^<<><<<><><vv^v>>^^>^<<>>><<^>vv><v>^vv^<>^>><>^^<><><<><>^^<><^<>v>^^<<v>v^<<>>v>^>^^>vv^^v<^vv><<vv^^^^^<<<<v<^<<>v^^v^<v>v><<<<<>>v^>^>><<>^^><>v>>v^<^^^^>>v><<v>>^v<<v><vv>>v^<<^>>><^<^v<>vvv<<vv<^<v^v>v<v<<v^^v><<>v<v<>^<>><^>^^^>^v^<<>v^v^^>>v>^v>v<><<^>v^<><<<v^>>>>>vvv^v<>^^>^^^<vvv<vv^^>v<v><v<vv^><^v>>v<v^^>^vvv^^>>vvvv^><^vv^^vvv<<>>^>v^v^v><^^^^vv^^><^<<><<<<v><<^v<^<>>^^vv<><^^><v^<^><^>v^^^<^^>>vv^^>><v<<^<>>><v<^<<v<v>v>>^>>>>><v>v<><^^>^<v<^^vv><<<^<><v^<^v^^v<<<v<<<vvv>><>>>vvvv^<^^v<v^v^vv^v^<v^<<>v>><^^^v><^v^<v^^><vv^<><^^<^<<<<vvv<v><>>>v^<v>v>vvv>><vv>^>^<^><^v>vvv^v><><>>><^<v<v<<<>v<v<<v^>^<v^v<vvvvv>>^><v>>v>>>>vv^<vvv^v^v>>v>v^><<>v^vv^><^>^<vv^v<<v><vv<<^v<>^><v^<^>v>vv^<^vv<v^>^<vv<v^><^>vvv<v^<^<>^v<v^^>><^^<vv^>>vv><^>>^><>>v><>><<<^>>v>^^<<^
+>>^vv>^>^><>>>v>^><^<><>><<<<><<^<^<v^v^v>>>><><vv>>^<>v<v^>v<<^>>v^v>^>^>v<^v>>v<vv^vvv<<^^^<^v<vv<>>^^><<><<^v><^^v>><v>^<v<><^>>v><v^v<^<v^>>v>>>^v<^v><<>v>^<^^^<^vv><<<><>^v^v^^>^v>>v<v<^<<v^^><<^vv>v>^vv<^>v<><<^<<^<^^v^<vv>^<>vv<^>>^^^<^v><>vv^>vv^^vvvv^>v>^v>^<><v^^>v<><vv^><>^>v<>><v<<>^^>^<>vv<>^vvv>><^^v<>>^<v<v^>>v^>>>vvv<<vv^^^^>>^^<<>vv<<>>>v<>v>v^^v<vvv<><><<<^v^>^v^^^v>>v^>v>^v<>v^><>^><v^vv<^<^v^^v<><vv<<^^><v>>^<>^<v>v<<v^^v<v><<>^><>>><><><<>^^<^>vvvv<<v<^<^v><^<<>>vvv^^vvvv>vv<<v<>^^<><<><>^<^v<^v>^^<><>>v><^>><v<v>v>>vv<<v<v<vv>^v^<>>^v^<><<<vv^^>v^<<v^v<^v^>><vv><>^^>><<^>><<v>^<>^>v<^^^vv^<<<<^vv>><vv^><^><^<^^<><v<<^>^^><v>^>^vv><vv><^v>v<vv>^><v^<vv>>vv^v>v>><v^^><^<vvv<v^^<<v^>^<^^^vvv<^>^>^><^^<v^<>v^vvv>^<<v<^^v>v>>>><>vv<>^v<<v>>^<^<<<<^v>^^>>vv>>v>v<vv^><^^v<<<v<<<<^>v^<^v<^^^><^v>^><v^^<^<>>>v^^<^v^<v<^^>vvv>^<<^v<>>^v<<^^v^<v<v<<v^v^<<>v>^^^<v>>^>>^^>>v^>v><>vv^<v<vv^v<vv^^vv>^^>>v<^>>v>v^<>>v^^v>>>v<<>vvvvv>><><>^^<<v>^<>v^^^<><^>><^^v^v^^<^<v><><<<v><<>
+vv>>^v<v<^v<<<<^v<>v<<^v^<vv><>>v<<><v<<><<^vvvv<<^<<v<>v<v>>^^>^<<^v<^v<^<>v><<vv^<vv<v^>v><<>vv^v><vv<<<>><^<v<<><<>v>>v><>>^^<>>>^<>v><><>v^<v>v>>^v>v>^<>><>^^<<^v><>^<^><^>>v^^<^<v^<>^^v>>v<^v><v^>^>vvv>v<<vvv^<v<v>v>v>^^vv<<>v>><^v^v^^v<^vv<<><>>>^^^v>v^^^>v^<><^<>^><v>><<>v^>^>v>><v>v>><^v^v<<>^v<>>v^v^v^^v^^>>v>^<^>>><^v^<<^>^>^>>v>>^>vvvv>>>^^^<<vv>^v<v<^^<v<<>^v>^<^>>v<><<v>v><v>v^<><^<<^v^<^<<^^v>^<v<<>v>v^<><^v^^>><>^<^^><<v^^^v^>>>v>vv^v^v<<<>^v<>^^vv<>^v><^vv<^vv^<<<^<<^^><<><<>^v^<v>v<vv^^^^>vv^^>^<<v<><^>^<<<v<><vv><^v<<>>v>>>><^^>^>^>>>>^<vv>^^v^^>v<^^<^vv>>^^^^vv<^>v<><vv<^^v><<><><^v^><^^>>^^>vv><v^<>v^v>v>^<<v><<^v^v>v>^<v^>><v^<<^<>>^^>>><vv<vv<<>>v<<^<^>><v<v>v><>v^<v^v>^vv>>><^^>>v^^>^>^<^>^v<v<^^>v>v<<vv>>^<>v>v^<v^<<vvv>^^<>vv>>^^>>><<^v<<v>vvv><v>^>v^vvvv^>>^<^<>v<vv>^<v^><<<v^v^>vv><>^<<vv^>>^>>^^v<><v<v^>>v^^v^><^><v^>^^v<^>^v^>^<>>^^>vv^vv<^^v<<<<^<vv<<<^vv>^^<vv^<v<v^><^>v>v^<<>^<^^^^^v>^^>^>vv>>v><^v^^>v<^>v^>><v<<v^>^>>^^v><>>^><<v<>v<><^^v>^v>^>v<v<^v<>^
+>^vv>^<vvvv>v<><<vv>><vv<>v^<<>>v>v<^><>^v<><>>^<<<v>^>vvvvv^>vv^^<>><^<>v>^^><v<>^<>>vv^vv^^v^>vv^<v>v^>>vv>>v^><<<>>^<<^>vv>v>^<>>>^^<v^^>><v^v<v^><<v>^v<>>^vv<>v<vv>^^>>><^<^^>>>vvv><><vv<v>v^<^^<^><>>^<<><<>>v>v^^^><^>v<<>^^<<vv<>>>v>>v^v<<><<^v^^<<vvv^v^^<>v><<^v>>^v<>^^^^v>^>>^>>v^>^>>v>>><^><<^v><>><><v^<v<<>><^v<^>vv<v^<>v^<<^><<<^^>>v<^>>v>>v>>>^<v^v<v<<>v>^><<vv>vv><^>v>^v<v^v><^<^vv^<vv<^^v>^^v^v<v<>>>>>^v>>^>^>v<>^>^<v^<>>^^v>v<>^<><^^<v<v^><<^v>v><>v>^>^<>><>>^>v^<v>v<<<>^><^v<><v>^^^^v<><^^v^^<^v>^<<v^>^>><^v><><<^^^v>><^^<<^>^vv<<^<>>v<<>>><v>>>^<<v<<><v<^v<v^v<>>^>v<<v^<><<>v<^v^<vv>><vvv>v<^^<<^v<<^v><>^vv>v<><v^><v<^^<<<>v<<<^^v^><^^^^<^^v<<^<>v><>>v<vv<vv<v^v<<>><v^v>^v<><v<><v>v><>><^>^^^<v<<^^>>v<<<<v<<^v^vv>>v^>vv<><<<^^><v>^^>^^v<^>^^^v<^^>>>^<^<>v<vv<<^^><^^v^vv<v<v^<^v<<v><^^^<v<>v<^<<v><^><><>v^v>>>^vv^<<^v<<><<<><^^^>>^<^v^v<<>v<v<^<^v^<<^<^>^v^v>v><^^>^>>^<<><v^><<^<<<>v^><>><^<v^v>>^<^<^v^<<<^>^<>^^<>>^<^v^v>v^><v^<>v^>>vv>>>^<>vv<><>^>>^><>>v><^>>>^><^v<vv

2024/d15/ex2/ex2.py

@@ -0,0 +1,149 @@
+#!/usr/bin/env python
+
+import copy
+import enum
+import sys
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class Direction(enum.StrEnum):
+    UP = "^"
+    RIGHT = ">"
+    DOWN = "v"
+    LEFT = "<"
+
+    def step(self, p: Point) -> Point:
+        dx: int
+        dy: int
+
+        match self:
+            case Direction.UP:
+                dx, dy = -1, 0
+            case Direction.RIGHT:
+                dx, dy = 0, 1
+            case Direction.DOWN:
+                dx, dy = 1, 0
+            case Direction.LEFT:
+                dx, dy = 0, -1
+
+        return Point(p.x + dx, p.y + dy)
+
+
+class Object(enum.StrEnum):
+    BOX = "O"
+    WALL = "#"
+
+
+# Maze always contains the left part of the object
+Maze = dict[Point, Object]
+# WideMaze maps left and right side of an object to its (left, right) tuple
+WideMaze = dict[Point, tuple[Point, Point]]
+
+
+def solve(input: str) -> int:
+    def parse_maze(input: list[str]) -> tuple[Point, Maze]:
+        robot: Point | None = None
+        maze: Maze = {}
+        for x, line in enumerate(input):
+            for y, c in enumerate(line):
+                if c == ".":
+                    continue
+                if c == "@":
+                    robot = Point(x, y * 2)
+                    continue
+                maze[Point(x, y * 2)] = Object(c)
+
+        assert robot is not None  # Sanity check
+        return robot, maze
+
+    def parse_directions(input: str) -> list[Direction]:
+        return [Direction(c) for c in input if c in Direction]
+
+    def parse(input: str) -> tuple[Point, Maze, list[Direction]]:
+        maze_input, directions_input = input.split("\n\n")
+        robot, maze = parse_maze(maze_input.splitlines())
+        directions = parse_directions(directions_input)
+        return robot, maze, directions
+
+    def step(robot: Point, maze: Maze, d: Direction) -> tuple[Point, Maze]:
+        def widen_maze() -> WideMaze:
+            res: WideMaze = {}
+            for p in maze.keys():
+                right_p = Point(p.x, p.y + 1)
+                res[p] = (p, right_p)
+                res[right_p] = (p, right_p)
+            return res
+
+        def boxes_along(wide_maze: WideMaze) -> set[Point] | None:
+            def helper(current: Point) -> set[Point] | None:
+                # Return empty set if we hit the air
+                if current not in wide_maze:
+                    return set()
+
+                # Query both sides of the object
+                left, right = wide_maze[current]
+
+                # Return None if we hit a wall
+                if maze[left] == Object.WALL:
+                    return None
+                assert right not in maze  # Sanity check
+
+                # Try to move both sides of the box recursively
+                res_left: set[Point] = set()
+                res_right: set[Point] = set()
+                # Only check next_left if not moving right
+                if (next_left := d.step(left)) != right:
+                    if (try_left := helper(next_left)) is None:
+                        return None
+                    res_left = try_left
+                # And only check next_right if not moving left
+                if (next_right := d.step(right)) != left:
+                    if (try_right := helper(next_right)) is None:
+                        return None
+                    res_right = try_right
+
+                # Both sides succeeded, return the set of boxes to move
+                return {left} | res_left | res_right
+
+            return helper(d.step(robot))
+
+        def move_boxes(boxes: set[Point]) -> Maze:
+            new_maze = copy.copy(maze)
+            # Do the move in two steps to avoid overwriting any values during movement
+            for box in boxes:
+                new_maze.pop(box)
+            for box in boxes:
+                new_maze[d.step(box)] = maze[box]
+            return new_maze
+
+        new_robot = d.step(robot)
+        # If we hit a wall, abort the step
+        if maze.get(new_robot) == Object.WALL:
+            return robot, maze
+        # If a box hits a wall, abort the step
+        if (boxes := boxes_along(widen_maze())) is None:
+            return robot, maze
+        # Otherwise move everything along the direction
+        return new_robot, move_boxes(boxes)
+
+    def compute_coordinates(maze: Maze) -> int:
+        return sum(100 * p.x + p.y for p, obj in maze.items() if obj == Object.BOX)
+
+    robot, maze, directions = parse(input)
+    for d in directions:
+        robot, maze = step(robot, maze, d)
+    return compute_coordinates(maze)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d15/ex2/input

@@ -0,0 +1,71 @@
+##################################################
+#......O.O..O......O......O..OO...O..O.O.O..O..O.#
+#....O.O..#.O....O#.#.#......O.O#O.O#O#..O.O.....#
+#.........O..#O......O...OO..O..O..O#....O.......#
+#.O.O......O#.#..#.#.........O...OOO.O..O..O....O#
+#..O......O.......O..O.#O......OO.O.O#..O.OO..O..#
+#O.O.....O.O......O....O..OO...#.#...O##OO#O.....#
+#O..O....OOOO...#.O.O.O#.....##.....O#.##..O.....#
+#O..O.O....O.#..O.O.OO#O.#..#.O....O..O.#.....O..#
+##..OOOO..O..#O.#.O....O...............OO.....O..#
+#O.O#.........OO..O..#..O.....O..O...O#.....O....#
+#..#O#O#...#....O...OOOO..O.....#O.......O.......#
+#..........O...O.....#OOOO#O..#..O..#O.........O.#
+##..O.OO.O......#...#OOO.OO..O.O.O.OO#.#OO..O.OO.#
+#....O.O..OO.O.OOO..OO...O...O..O.O.O....O...O...#
+#O..#OO.........O#......OOO....O.....O.OO.#.O.##.#
+#.O.OOO.....O....O...#O.O.O.#.O.O..........O...OO#
+#.OO.OO...O...O..#........O.O...O.O...#OO.O....O.#
+#OO...O.OO.#O.....OOO.#O#.O.#......OO.....OO#..O.#
+#..O......O.....#...#O.....O.....OOO.....O.#OO...#
+#.....#O..O..#...OOO.#O.O..O.O#...#OO.O......O..##
+#..OO.OOO#.O.....OO..#.OO......OO.O....O...O.....#
+#.O.OO..............#..O.....O.O...OO.....#.O#...#
+#......OO.....OOO.O..O#OO...OO..O#..O..O.OO......#
+#.#O....O....O..#O..O..O@..#..#...#......O.......#
+#.#..O.O.OO...O.O#....O..#..O...OOOOO...#.OOO#...#
+##O..O.O....#O....OO#O.#O......O.....O..O...#O...#
+#...O...........O.#O..O.#...#.O.O.O...........#.##
+#O#O.......O..O.....OO.#O.O.#OOOO#.O.O.O.O.......#
+##O.O..OO...#.O..#.O.O..OOO.O.O#.....O.O..#.O.O.O#
+#..OO...O..#O.O.#.OOO.....OO........#..OO.#...O.##
+#O.#.#..#.O.O...O..O.#O..O.O.OO......O.OO.O...O.##
+#.O.OO...OO.........#....O.OO.OO..O#O.#O........##
+#.......O.......OO#...#....#.OOO#.#........#.O...#
+#...O.O.#.O.O.........OOO.O.O...O....O....#...O#.#
+#....O.O.......#.......#..O##.O.O.....O...O.O...O#
+#.O.O.O..O#.O.O...##O#O...O.....#OO#O.O....O..O..#
+#O.O.O.#..O...O.O.......#.OO..#..........O...O.O.#
+#...O...O.....O....##......#..OO....##.O..OO.....#
+#..OO..O..O..OOO.....#O..OO.O.OOOO.#.O...O.#.....#
+#...O...O.O.O...O.#O.#.O...O#.#......O..OO..O.##O#
+#...O.O#......OO.#.O.....OO..O.......#...#.O...#.#
+##OO..#O.....OO..............#...O#..O#......OOO.#
+##OOOO..O.#..O.O....O....O..O#.O#....O....O.O....#
+#.....#......O...OOO.O........O....#O.OO.....OO.O#
+#O.#....OO#....OO.O....#O#........#.#.OO.#.O...OO#
+#.O.....O.OO.....OO...#O..OOO.O...OO....O.O##O...#
+##O..OO.OO..#..O.O.O.##O......O..#....OOO....OO..#
+#O..O....O.........OO#.#......OO...##.O.......O..#
+##################################################
+
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2024/d16/ex1/ex1.py

@@ -0,0 +1,118 @@
+#!/usr/bin/env python
+
+import enum
+import heapq
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class ParsedMaze(NamedTuple):
+    start: Point
+    end: Point
+    blocks: set[Point]
+
+
+class Direction(enum.IntEnum):
+    EAST = enum.auto()
+    WEST = enum.auto()
+    NORTH = enum.auto()
+    SOUTH = enum.auto()
+
+    def rotations(self) -> tuple["Direction", "Direction"]:
+        match self:
+            case Direction.EAST | Direction.WEST:
+                return (Direction.NORTH, Direction.SOUTH)
+            case Direction.NORTH | Direction.SOUTH:
+                return (Direction.EAST, Direction.WEST)
+
+    def step(self, p: Point) -> Point:
+        dx: int
+        dy: int
+
+        match self:
+            case Direction.EAST:
+                dx, dy = 0, 1
+            case Direction.WEST:
+                dx, dy = 0, -1
+            case Direction.NORTH:
+                dx, dy = -1, 0
+            case Direction.SOUTH:
+                dx, dy = 1, 0
+
+        return Point(p.x + dx, p.y + dy)
+
+
+Node = tuple[Point, Direction]
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> ParsedMaze:
+        start: Point | None = None
+        end: Point | None = None
+        blocks: set[Point] = set()
+        for x, line in enumerate(input):
+            for y, c in enumerate(line):
+                if c == ".":
+                    continue
+                p = Point(x, y)
+                if c == "S":
+                    start = p
+                elif c == "E":
+                    end = p
+                elif c == "#":
+                    blocks.add(p)
+                else:
+                    assert False  # Sanity check
+        assert start is not None  # Sanity check
+        assert end is not None  # Sanity check
+        return ParsedMaze(start, end, blocks)
+
+    def djikstra(start: Point, end: Point, blocks: set[Point]) -> int:
+        def next_moves(
+            pos: Point,
+            dir: Direction,
+        ) -> Iterator[tuple[int, Point, Direction]]:
+            transitions = [(1, dir.step(pos), dir)]
+            for new_dir in dir.rotations():
+                transitions.append((1000, pos, new_dir))
+            for cost, pos, dir in transitions:
+                if pos in blocks:
+                    continue
+                yield cost, pos, dir
+
+        # Priority queue of (distance, point, direction)
+        queue = [(0, start, Direction.EAST)]
+        seen: set[Node] = set()
+
+        while len(queue) > 0:
+            cost, p, dir = heapq.heappop(queue)
+            if p == end:
+                return cost
+            # We must have seen (p, dir) with a smaller distance before
+            if (p, dir) in seen:
+                continue
+            # First time encountering (p, dir), must be the smallest distance to it
+            seen.add((p, dir))
+            # Add all neighbours to be visited
+            for n_cost, n, n_dir in next_moves(p, dir):
+                heapq.heappush(queue, (cost + n_cost, n, n_dir))
+
+        assert False  # Sanity check
+
+    start, end, blocks = parse(input.splitlines())
+    return djikstra(start, end, blocks)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d16/ex1/input

@@ -0,0 +1,141 @@
+#############################################################################################################################################
+#.......#...#.....#.......#.........#.#.............#...........#.......#...............#.........#...........#...#.......#.......#.......#E#
+#.#####.#.###.#.#.#.#.#.#.#.#.#####.#.#.###.###.###.###.#####.#.###.#.#.#.#####.#######.#.#######.#####.#####.#.#.#.###.#.#.###.#.#.#.###.#.#
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+#############################################################################################################################################

2024/d16/ex2/ex2.py

@@ -0,0 +1,149 @@
+#!/usr/bin/env python
+
+import enum
+import heapq
+import sys
+from collections import defaultdict
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+
+class ParsedMaze(NamedTuple):
+    start: Point
+    end: Point
+    blocks: set[Point]
+
+
+class Direction(enum.IntEnum):
+    EAST = enum.auto()
+    WEST = enum.auto()
+    NORTH = enum.auto()
+    SOUTH = enum.auto()
+
+    def rotations(self) -> tuple["Direction", "Direction"]:
+        match self:
+            case Direction.EAST | Direction.WEST:
+                return (Direction.NORTH, Direction.SOUTH)
+            case Direction.NORTH | Direction.SOUTH:
+                return (Direction.EAST, Direction.WEST)
+
+    def step(self, p: Point) -> Point:
+        dx: int
+        dy: int
+
+        match self:
+            case Direction.EAST:
+                dx, dy = 0, 1
+            case Direction.WEST:
+                dx, dy = 0, -1
+            case Direction.NORTH:
+                dx, dy = -1, 0
+            case Direction.SOUTH:
+                dx, dy = 1, 0
+
+        return Point(p.x + dx, p.y + dy)
+
+
+Node = tuple[Point, Direction]
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> ParsedMaze:
+        start: Point | None = None
+        end: Point | None = None
+        blocks: set[Point] = set()
+        for x, line in enumerate(input):
+            for y, c in enumerate(line):
+                if c == ".":
+                    continue
+                p = Point(x, y)
+                if c == "S":
+                    start = p
+                elif c == "E":
+                    end = p
+                elif c == "#":
+                    blocks.add(p)
+                else:
+                    assert False  # Sanity check
+        assert start is not None  # Sanity check
+        assert end is not None  # Sanity check
+        return ParsedMaze(start, end, blocks)
+
+    def count_path_cells(start: Point, end: Point, blocks: set[Point]) -> int:
+        def next_moves(
+            pos: Point,
+            dir: Direction,
+        ) -> Iterator[tuple[int, Point, Direction]]:
+            transitions = [(1, dir.step(pos), dir)]
+            for new_dir in dir.rotations():
+                transitions.append((1000, pos, new_dir))
+            for cost, pos, dir in transitions:
+                if pos in blocks:
+                    continue
+                yield cost, pos, dir
+
+        def get_all_predecessors(
+            predecessors: dict[Node, set[Node]],
+        ) -> set[Point]:
+            queue = {(end, dir) for dir in Direction}
+            visited: set[Node] = set()
+            while queue:
+                cur = queue.pop()
+                visited.add(cur)
+                for pred in predecessors[cur]:
+                    if pred in visited:
+                        continue
+                    queue.add(pred)
+            return set(p for p, _ in visited)
+
+        # Priority queue of (distance, point)
+        queue = [(0, start, Direction.EAST)]
+        seen: set[Node] = set()
+        predecessors: dict[Node, set[Node]] = defaultdict(set)
+        predecessor_cost: dict[Node, int] = {}
+        # Use an invalid maximum cost to simplify the loop
+        max_cost: int = -1
+
+        while len(queue) > 0:
+            cost, p, dir = heapq.heappop(queue)
+            # Did we go past the optimal cost, if so stop the loop
+            if max_cost > 0 and cost > max_cost:
+                break
+            # Otherwise, record the minimum cost
+            if p == end:
+                max_cost = cost
+            # We must have seen (p, dir) with a smaller distance before
+            if (p, dir) in seen:
+                continue
+            # First time encountering (p, dir), must be the smallest distance to it
+            seen.add((p, dir))
+            # Add all neighbours to be visited
+            for n_cost, n, n_dir in next_moves(p, dir):
+                n_cost += cost
+                # Record predecessors
+                if predecessor_cost.setdefault((n, n_dir), n_cost) > n_cost:
+                    predecessor_cost[(n, n_dir)] = n_cost
+                    predecessors[(n, n_dir)] = {(p, dir)}
+                elif predecessor_cost[(n, n_dir)] == n_cost:
+                    predecessors[(n, n_dir)].add((p, dir))
+                heapq.heappush(queue, (n_cost, n, n_dir))
+
+        # Run back up the tree of predecessors to count all cells
+        return len(get_all_predecessors(predecessors))
+
+    start, end, blocks = parse(input.splitlines())
+    return count_path_cells(start, end, blocks)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d16/ex2/input

@@ -0,0 +1,141 @@
+#############################################################################################################################################
+#.......#...#.....#.......#.........#.#.............#...........#.......#...............#.........#...........#...#.......#.......#.......#E#
+#.#####.#.###.#.#.#.#.#.#.#.#.#####.#.#.###.###.###.###.#####.#.###.#.#.#.#####.#######.#.#######.#####.#####.#.#.#.###.#.#.###.#.#.#.###.#.#
+#.....#.#.....#.#.#.#.#...#.#.....#...#.#...#...#.#...#.#.....#...#.#.#.....#...#...#...#...#...#.#.....#...#.#.#...#.....#.#...#.#.#.#.....#
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+#.#.#######.#.#####.#.#.#####.#.#####.#####.###.###.#.#.###.#.###########.#.###.#.#####.###.#.#####.#.###.#.#####.#######.#.#.#.#.#.#####.#.#
+#.#.....#...#.#.....#.#.#...#.#.....#.....#.#.#...#.#.#...#...#.......................#...#...#...#.#...................#.#...#.#.#.#.......#
+#.###.#.#.###.#.#####.#.#.#.#######.#######.#.###.#.#.###.###.#.#######.#####.###.#.#.###.#.###.#.#.###.#.#.#.#####.###.#.#####.#.#.#.#####.#
+#S....#...#.....#.....#...#.................#.......#...........#.............#.....#...#.......#.....................................#.....#
+#############################################################################################################################################

2024/d17/ex1/ex1.py

@@ -0,0 +1,107 @@
+#!/usr/bin/env python
+
+import dataclasses
+import enum
+import sys
+
+
+@dataclasses.dataclass
+class Registers:
+    reg_a: int
+    reg_b: int
+    reg_c: int
+
+
+class Instruction(enum.IntEnum):
+    ADV = 0
+    BXL = 1
+    BST = 2
+    JNZ = 3
+    BXC = 4
+    OUT = 5
+    BDV = 6
+    CDV = 7
+
+
+@dataclasses.dataclass
+class Computer:
+    registers: Registers
+    program: list[int]
+    ip: int = 0
+
+    def _resolve_combo_operand(self, operand: int) -> int:
+        assert operand != 7  # Sanity check
+        if 0 <= operand <= 3:
+            return operand
+        if operand == 4:
+            return self.registers.reg_a
+        if operand == 5:
+            return self.registers.reg_b
+        if operand == 6:
+            return self.registers.reg_c
+        assert False  # Sanity check
+
+    # Returns False if the computer is halted
+    # `output` is an out parameter
+    def step(self, output: list[int]) -> bool:
+        # NOTE: also accounting for operand in overflow check here
+        if (self.ip + 1) >= len(self.program):
+            return False
+
+        instr, literal_operand = (
+            Instruction(self.program[self.ip]),
+            self.program[self.ip + 1],
+        )
+        combo_operand = self._resolve_combo_operand(literal_operand)
+
+        ip_delta = 2
+        match instr:
+            case Instruction.ADV:
+                self.registers.reg_a //= 2**combo_operand
+            case Instruction.BXL:
+                self.registers.reg_b ^= literal_operand
+            case Instruction.BST:
+                self.registers.reg_b = combo_operand % 8
+            case Instruction.JNZ:
+                if self.registers.reg_a != 0:
+                    self.ip = literal_operand
+                    ip_delta = 0
+            case Instruction.BXC:
+                self.registers.reg_b ^= self.registers.reg_c
+            case Instruction.OUT:
+                output.append(combo_operand % 8)
+            case Instruction.BDV:
+                self.registers.reg_b = self.registers.reg_a // 2**combo_operand
+            case Instruction.CDV:
+                self.registers.reg_c = self.registers.reg_a // 2**combo_operand
+        self.ip += ip_delta
+
+        return True
+
+
+def solve(input: str) -> str:
+    def parse_registers(input: list[str]) -> Registers:
+        def parse_register(input: str) -> int:
+            return int(input.split(": ")[1])
+
+        return Registers(*map(parse_register, input))
+
+    def parse(input: str) -> Computer:
+        registers, program_str = input.split("\n\n")
+        program = list(map(int, program_str.removeprefix("Program: ").split(",")))
+        return Computer(parse_registers(registers.splitlines()), program)
+
+    computer = parse(input)
+    output: list[int] = []
+    while computer.step(output):
+        pass
+    return ",".join(str(n) for n in output)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d17/ex1/input

@@ -0,0 +1,5 @@
+Register A: 30886132
+Register B: 0
+Register C: 0
+
+Program: 2,4,1,1,7,5,0,3,1,4,4,4,5,5,3,0

2024/d17/ex2/ex2.py

@@ -0,0 +1,135 @@
+#!/usr/bin/env python
+
+import copy
+import dataclasses
+import enum
+import sys
+
+
+@dataclasses.dataclass
+class Registers:
+    reg_a: int
+    reg_b: int
+    reg_c: int
+
+
+class Instruction(enum.IntEnum):
+    ADV = 0
+    BXL = 1
+    BST = 2
+    JNZ = 3
+    BXC = 4
+    OUT = 5
+    BDV = 6
+    CDV = 7
+
+
+@dataclasses.dataclass
+class Computer:
+    registers: Registers
+    program: list[int]
+    ip: int = 0
+
+    def _resolve_combo_operand(self, operand: int) -> int:
+        assert operand != 7  # Sanity check
+        if 0 <= operand <= 3:
+            return operand
+        if operand == 4:
+            return self.registers.reg_a
+        if operand == 5:
+            return self.registers.reg_b
+        if operand == 6:
+            return self.registers.reg_c
+        assert False  # Sanity check
+
+    # Returns False if the computer is halted
+    # `output` is an out parameter
+    def step(self, output: list[int]) -> bool:
+        # NOTE: also accounting for operand in overflow check here
+        if (self.ip + 1) >= len(self.program):
+            return False
+
+        instr, literal_operand = (
+            Instruction(self.program[self.ip]),
+            self.program[self.ip + 1],
+        )
+        combo_operand = self._resolve_combo_operand(literal_operand)
+
+        ip_delta = 2
+        match instr:
+            case Instruction.ADV:
+                self.registers.reg_a //= 2**combo_operand
+            case Instruction.BXL:
+                self.registers.reg_b ^= literal_operand
+            case Instruction.BST:
+                self.registers.reg_b = combo_operand % 8
+            case Instruction.JNZ:
+                if self.registers.reg_a != 0:
+                    self.ip = literal_operand
+                    ip_delta = 0
+            case Instruction.BXC:
+                self.registers.reg_b ^= self.registers.reg_c
+            case Instruction.OUT:
+                output.append(combo_operand % 8)
+            case Instruction.BDV:
+                self.registers.reg_b = self.registers.reg_a // 2**combo_operand
+            case Instruction.CDV:
+                self.registers.reg_c = self.registers.reg_a // 2**combo_operand
+        self.ip += ip_delta
+
+        return True
+
+
+def solve(input: str) -> int:
+    def parse_registers(input: list[str]) -> Registers:
+        def parse_register(input: str) -> int:
+            return int(input.split(": ")[1])
+
+        return Registers(*map(parse_register, input))
+
+    def parse(input: str) -> Computer:
+        registers, program_str = input.split("\n\n")
+        program = list(map(int, program_str.removeprefix("Program: ").split(",")))
+        return Computer(parse_registers(registers.splitlines()), program)
+
+    # Rely on the shape of the input, which reads 3 bits of reg_a at a time
+    def find_quine(computer: Computer) -> int:
+        def is_quine(a: int, n_outputs: int) -> bool:
+            if n_outputs == 0:
+                return True
+            tmp = copy.deepcopy(computer)
+            tmp.registers.reg_a = a
+            output: list[int] = []
+            while tmp.step(output):
+                pass
+            return output[-n_outputs:] == computer.program[-n_outputs:]
+
+        def helper(a: int, n_outputs: int) -> int | None:
+            # If not a quine of the correct length, abandon this candidate
+            if not is_quine(a, n_outputs):
+                return None
+            # If we've found all digits, return the candidate
+            if n_outputs == len(computer.program):
+                return a
+            # Try to find a longer quine, starting from this candidate
+            for next_a in range(a * 8, a * 8 + 8):
+                # We found a full quine, guaranteed to be the smallest value
+                if (res := helper(next_a, n_outputs + 1)) is not None:
+                    return res
+            return None
+
+        res = helper(0, 0)
+        assert res is not None  # Sanity check
+        return res
+
+    computer = parse(input)
+    return find_quine(computer)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d17/ex2/input

@@ -0,0 +1,5 @@
+Register A: 30886132
+Register B: 0
+Register C: 0
+
+Program: 2,4,1,1,7,5,0,3,1,4,4,4,5,5,3,0

2024/d18/ex1/ex1.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+import heapq
+import sys
+from typing import Iterator, NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+    def neighbours(self) -> Iterator["Point"]:
+        for dx, dy in (
+            (-1, 0),
+            (1, 0),
+            (0, -1),
+            (0, 1),
+        ):
+            yield Point(self.x + dx, self.y + dy)
+
+
+DIMS = Point(70, 70)
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> list[Point]:
+        return [Point(*map(int, line.split(","))) for line in input]
+
+    def djikstra(start: Point, end: Point, blocks: set[Point]) -> int:
+        # Priority queue of (distance, point)
+        queue = [(0, start)]
+        seen: set[Point] = set()
+
+        while len(queue) > 0:
+            cost, p = heapq.heappop(queue)
+            if p == end:
+                return cost
+            # We must have seen p with a smaller distance before
+            if p in seen:
+                continue
+            # First time encountering p, must be the smallest distance to it
+            seen.add(p)
+            # Add all neighbours to be visited
+            for n in p.neighbours():
+                if p in blocks:
+                    continue
+                if not 0 <= p.x <= DIMS.x:
+                    continue
+                if not 0 <= p.y <= DIMS.y:
+                    continue
+                heapq.heappush(queue, (cost + 1, n))
+
+        assert False  # Sanity check
+
+    coords = parse(input.splitlines())
+    return djikstra(Point(0, 0), DIMS, set(coords[:1024]))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d18/ex2/ex2.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+
+import heapq
+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 (
+            (-1, 0),
+            (1, 0),
+            (0, -1),
+            (0, 1),
+        ):
+            yield Point(self.x + dx, self.y + dy)
+
+
+DIMS = Point(70, 70)
+
+
+def solve(input: str) -> str:
+    def parse(input: list[str]) -> list[Point]:
+        return [Point(*map(int, line.split(","))) for line in input]
+
+    def djikstra(start: Point, end: Point, blocks: set[Point]) -> int | None:
+        # Priority queue of (distance, point)
+        queue = [(0, start)]
+        seen: set[Point] = set()
+
+        while len(queue) > 0:
+            cost, p = heapq.heappop(queue)
+            if p == end:
+                return cost
+            # We must have seen p with a smaller distance before
+            if p in seen:
+                continue
+            # First time encountering p, must be the smallest distance to it
+            seen.add(p)
+            # Add all neighbours to be visited
+            for n in p.neighbours():
+                if p in blocks:
+                    continue
+                if not 0 <= p.x <= DIMS.x:
+                    continue
+                if not 0 <= p.y <= DIMS.y:
+                    continue
+                heapq.heappush(queue, (cost + 1, n))
+
+        return None
+
+    def bisect_cutoff(start: Point, end: Point, blocks: list[Point]) -> Point:
+        # Cutting off the path is monotonic: once cut-off, it's never uncut
+        low, high = 0, len(blocks)
+        while low < high:
+            mid = low + (high - low) // 2
+            if djikstra(start, end, set(blocks[: mid + 1])) is None:
+                high = mid
+            else:
+                low = mid + 1
+        return blocks[low]
+
+    coords = parse(input.splitlines())
+    byte = bisect_cutoff(Point(0, 0), DIMS, coords)
+    return f"{byte.x},{byte.y}"
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d19/ex1/ex1.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import functools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> tuple[frozenset[str], list[str]]:
+        towels, patterns = input.split("\n\n")
+        return frozenset(towels.split(", ")), patterns.splitlines()
+
+    @functools.cache
+    def is_possible(pattern: str, towels: frozenset[str]) -> bool:
+        if pattern == "":
+            return True
+        return any(
+            is_possible(pattern.removeprefix(towel), towels)
+            for towel in towels
+            if pattern.startswith(towel)
+        )
+
+    towels, patterns = parse(input)
+    return sum(is_possible(pattern, towels) for pattern in patterns)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d19/ex1/input

@@ -0,0 +1,402 @@
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+
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2024/d19/ex2/ex2.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import functools
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> tuple[frozenset[str], list[str]]:
+        towels, patterns = input.split("\n\n")
+        return frozenset(towels.split(", ")), patterns.splitlines()
+
+    @functools.cache
+    def count_ways(pattern: str, towels: frozenset[str]) -> int:
+        if pattern == "":
+            return 1
+        return sum(
+            count_ways(pattern.removeprefix(towel), towels)
+            for towel in towels
+            if pattern.startswith(towel)
+        )
+
+    towels, patterns = parse(input)
+    return sum(count_ways(pattern, towels) for pattern in patterns)
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()

2024/d19/ex2/input

@@ -0,0 +1,402 @@
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