30 lines
894 B
Python
30 lines
894 B
Python
#!/usr/bin/env python3
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def from_file(name):
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mx = []
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with open(name, 'r') as f:
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for row in f.readlines():
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mx.append([int(num) if num[-1] != '\n' else int(num[:-1]) for num in row.split(',')])
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return mx
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def main():
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mx = from_file('data/082_matrix.txt')
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rl = len(mx)
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cl = len(mx[0])
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for col in range(cl - 2, -1, -1):
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cache = [None for i in range(rl)]
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cache[rl - 1] = sum(mx[rl - 1][col : col + 2])
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for row in range(rl - 2, -1, -1):
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cache[row] = mx[row][col] + min(cache[row + 1], mx[row][col + 1])
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s = sum(mx[0][col : col + 2])
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mx[0][col] = min(s, cache[0])
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for row in range(1, rl):
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s = mx[row][col] + min(s, mx[row][col + 1])
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mx[row][col] = min(cache[row], s)
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return min(list(zip(*mx))[0])
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if __name__ == '__main__':
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print(main())
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