50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
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#!/usr/bin/env python
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import itertools
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import sys
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from typing import NamedTuple
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class Point(NamedTuple):
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x: int
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y: int
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def solve(input: str) -> int:
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def parse(input: list[str]) -> dict[Point, str]:
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return {
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Point(x, y): c for x, line in enumerate(input) for y, c in enumerate(line)
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}
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def count_xmas(grid: dict[Point, str], dims: Point) -> int:
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max_x, max_y = dims
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count = 0
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for x, y in itertools.product(range(max_x), range(max_y)):
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if grid.get(Point(x, y)) != "A":
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continue
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if {grid.get(Point(x + dx, y + dy)) for dx, dy in ((-1, -1), (1, 1))} != {
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"M",
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"S",
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}:
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continue
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if {grid.get(Point(x + dx, y + dy)) for dx, dy in ((1, -1), (-1, 1))} != {
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"M",
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"S",
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}:
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continue
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count += 1
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return count
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lines = input.splitlines()
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grid = parse(lines)
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return count_xmas(grid, Point(len(lines), len(lines[0])))
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def main() -> None:
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input = sys.stdin.read()
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print(solve(input))
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if __name__ == "__main__":
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main()
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