34 lines
627 B
Python
34 lines
627 B
Python
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#!/usr/bin/env python
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import sys
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from math import prod
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from typing import List, Tuple
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def solve(trees: List[str], delta: Tuple[int, int]) -> int:
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x, y = 0, 0
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sum = 0
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while True:
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x += delta[0]
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y += delta[1]
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if y >= len(trees):
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break
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sum += trees[y][x % len(trees[0])] == "#"
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return sum
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def main() -> None:
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input = [line.strip() for line in sys.stdin.readlines()]
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deltas = [
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(1, 1),
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(3, 1),
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(5, 1),
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(7, 1),
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(1, 2),
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]
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print(prod(solve(input, delt) for delt in deltas))
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if __name__ == "__main__":
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main()
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