21 lines
528 B
Python
Executable file
21 lines
528 B
Python
Executable file
#!/usr/bin/env python
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def count_trees(right, down, lines):
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n = 0
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for i, line in enumerate(lines[::down]):
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c = line[(i*right) % len(line)]
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if c == '#':
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n += 1
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return n
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if __name__ == '__main__':
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with open('input.txt', 'r') as f:
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lines = [line.strip() for line in f.readlines()]
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print(count_trees(3, 1, lines))
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hits_multiplied = 1
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for slope in ((1,1), (3,1), (5,1), (7,1), (1,2)):
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hits_multiplied *= count_trees(*slope, lines)
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print(hits_multiplied)
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