day16 - almost correct (507 vs. 486)

day16.py

@@ -0,0 +1,93 @@
+from collections import deque
+from heapq import heappush, heappop
+from tools.aoc import AOCDay
+from tools.coordinate import Coordinate
+from tools.grid import Grid
+from typing import Any
+
+
+def get_best_score(grid: Grid) -> tuple[int, set[Coordinate]]:
+    target = Coordinate(grid.maxX - 1, 1)
+    queue = [(0, Coordinate(1, grid.maxY - 1), Coordinate(1, 0), {Coordinate(1, grid.maxY - 1)})]
+    visited = set()
+    while queue:
+        score, pos, facing, path = heappop(queue)
+        if pos == target:
+            return score, path
+
+        if pos in visited:
+            continue
+        visited.add(pos)
+
+        for n in grid.getNeighboursOf(pos, includeDiagonal=False):
+            if grid.get(n) or n in visited:
+                continue
+
+            add_turn = 1001 if n - pos != facing else 1
+            heappush(queue, (score + add_turn, n, n - pos, path | {n}))
+
+
+def get_tiles_from_all_paths(grid: Grid) -> int:
+    target_score, target_path = get_best_score(grid)
+    target = Coordinate(grid.maxX - 1, 1)
+    queue = [(0, Coordinate(1, grid.maxY - 1), Coordinate(1, 0), {Coordinate(1, grid.maxY - 1)})]
+    # all_paths = set()
+    visited = {}
+    while queue:
+        score, pos, facing, path = heappop(queue)
+        if pos in visited and score > visited[pos][0] + 1000:
+            continue
+        if pos in target_path and pos in visited:
+            # print(f"{pos} in target_path and visited. {score=}, {visited[pos]=}, discarding {path=}")
+            if score <= visited[pos][0] or score == visited[pos][0] + 1000:
+                target_path |= path
+            continue
+
+        visited[pos] = (score, facing)
+        if pos == target:
+            target_path |= path
+            continue
+
+        if score >= target_score:
+            continue
+
+        for n in grid.getNeighboursOf(pos, includeDiagonal=False):
+            if grid.get(n) or n in path:
+                continue
+
+            add_turn = 1001 if n - pos != facing else 1
+            heappush(queue, (score + add_turn, n, n - pos, path | {n}))
+
+    for p in target_path:
+        grid.set(p, "O")
+    grid.print()
+    return len(target_path)
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (7036, "input16_test"),
+            (11048, "input16_test2"),
+            (93436, "input16"),
+        ],
+        [
+            (45, "input16_test"),
+            (64, "input16_test2"),
+            (486, "input16"),
+        ],
+    ]
+
+    def parse_input(self) -> Grid:
+        return Grid().from_data(self.getInput(), default=None, translate={r"[\.SE]": False, "#": True})
+
+    def part1(self) -> Any:
+        return get_best_score(self.parse_input())[0]
+
+    def part2(self) -> Any:
+        return get_tiles_from_all_paths(self.parse_input())
+
+
+if __name__ == "__main__":
+    day = Day(2024, 16)
+    day.run(verbose=True)

inputs/input16

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