4 changed files with 0 additions and 547 deletions
--- a/2024/d16/ex1/ex1.py
+++ b/2024/d16/ex1/ex1.py
@ -1,117 +0,0 @@
-#!/usr/bin/env python
-
-import enum
-import heapq
-import sys
-from typing import Iterator, 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()
--- a/2024/d16/ex1/input
+++ b/2024/d16/ex1/input
@ -1,141 +0,0 @@
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-#############################################################################################################################################
--- a/2024/d16/ex2/ex2.py
+++ b/2024/d16/ex2/ex2.py
@ -1,148 +0,0 @@
-#!/usr/bin/env python
-
-import enum
-import heapq
-import sys
-from collections import defaultdict
-from typing import Iterator, 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()
--- a/2024/d16/ex2/input
+++ b/2024/d16/ex2/input
@ -1,141 +0,0 @@
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