2023/d23/ex1/ex1.py

@@ -1,93 +0,0 @@
-#!/usr/bin/env python
-
-import enum
-import sys
-from collections.abc import Iterator
-from typing import NamedTuple, Optional
-
-
-class Point(NamedTuple):
-    x: int
-    y: int
-
-
-class Cell(enum.StrEnum):
-    PATH = "."
-    NORTH_SLOPE = "^"
-    SOUTH_SLOPE = "v"
-    WEST_SLOPE = "<"
-    EAST_SLOPE = ">"
-
-    def neighbours(self) -> Iterator[Point]:
-        match self:
-            case self.PATH:
-                yield from (
-                    Point(-1, 0),
-                    Point(1, 0),
-                    Point(0, -1),
-                    Point(0, 1),
-                )
-            case self.NORTH_SLOPE:
-                yield Point(-1, 0)
-            case self.SOUTH_SLOPE:
-                yield Point(1, 0)
-            case self.WEST_SLOPE:
-                yield Point(0, -1)
-            case self.EAST_SLOPE:
-                yield Point(0, 1)
-
-    def apply(self, pos: Point) -> Iterator[Point]:
-        for dx, dy in self.neighbours():
-            yield Point(pos.x + dx, pos.y + dy)
-
-
-Trails = dict[Point, Cell]
-
-
-def solve(input: list[str]) -> int:
-    def parse(input: list[str]) -> Trails:
-        res: Trails = {}
-
-        for x, line in enumerate(input):
-            for y, c in enumerate(line):
-                if c == "#":
-                    continue
-                res[Point(x, y)] = Cell(c)
-
-        return res
-
-    def explore(trails: Trails, start: Point, dest: Point) -> int:
-        def recurse(start: Point, seen: set[Point]) -> Optional[int]:
-            if start == dest:
-                return 0
-            if start not in trails:
-                return None
-            next_step = (
-                recurse(n, seen | {n})
-                for n in trails[start].apply(start)
-                if n not in seen
-            )
-            distances = [dist for dist in next_step if dist is not None]
-            if not distances:
-                return None
-            return max(distances) + 1
-
-        res = recurse(start, {start})
-        assert res is not None  # Sanity check
-        return res
-
-    trails = parse(input)
-    start, dest = Point(0, 1), Point(len(input) - 1, len(input[0]) - 2)
-    assert start in trails  # Sanity check
-    assert dest in trails  # Sanity check
-    sys.setrecursionlimit(10_000)
-    return explore(trails, start, dest)
-
-
-def main() -> None:
-    input = sys.stdin.read().splitlines()
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()

2023/d23/ex1/input

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

2023/d23/ex2/ex2.py

@@ -1,104 +0,0 @@
-#!/usr/bin/env python
-
-import copy
-import sys
-from collections.abc import Iterator
-from typing import NamedTuple, Optional
-
-
-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)
-
-
-Trails = set[Point]
-Graph = dict[Point, dict[Point, int]]
-
-
-def solve(input: list[str]) -> int:
-    def parse(input: list[str]) -> Trails:
-        res: Trails = set()
-
-        for x, line in enumerate(input):
-            for y, c in enumerate(line):
-                if c == "#":
-                    continue
-                res.add(Point(x, y))
-
-        return res
-
-    def to_graph(trails: Trails) -> Graph:
-        graph: Graph = {p: {} for p in trails}
-
-        for p in trails:
-            for n in p.neighbours():
-                if n not in trails:
-                    continue
-                graph[p][n] = 1
-
-        return graph
-
-    # Remove every node which has exactly two neighbours (i.e: straight lines)
-    def condense_graph(graph: Graph) -> Graph:
-        graph = copy.deepcopy(graph)
-        nodes = list(graph.keys())
-
-        for n in nodes:
-            if len(graph[n]) != 2:
-                continue
-            (n1, d1), (n2, d2) = graph[n].items()
-            del graph[n1][n]
-            del graph[n2][n]
-            del graph[n]
-            graph[n1][n2] = d1 + d2
-            graph[n2][n1] = d1 + d2
-
-        return graph
-
-    def explore(graph: Graph, start: Point, end: Point) -> int:
-        def recurse(start: Point, seen: set[Point]) -> Optional[int]:
-            if start == end:
-                return 0
-            if start not in graph:
-                return None
-            next_step = (
-                (dist, recurse(n, seen | {n}))
-                for n, dist in graph[start].items()
-                if n not in seen
-            )
-            distances = [
-                (dist + steps) for dist, steps in next_step if steps is not None
-            ]
-            if not distances:
-                return None
-            return max(distances)
-
-        res = recurse(start, {start})
-        assert res is not None  # Sanity check
-        return res
-
-    trails = parse(input)
-    graph = to_graph(trails)
-    graph = condense_graph(graph)
-    start, dest = Point(0, 1), Point(len(input) - 1, len(input[0]) - 2)
-    assert start in graph  # Sanity check
-    assert dest in graph  # Sanity check
-    return explore(graph, start, dest)
-
-
-def main() -> None:
-    input = sys.stdin.read().splitlines()
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()

2023/d23/ex2/input

@@ -1,141 +0,0 @@
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