9 lines
241 B
Python
9 lines
241 B
Python
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A = {
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frozenset({i for i, c in enumerate(B) if c == "#"})
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for B in open("input").read().strip().split("\n\n")
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}
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L = {a for a in A if 1 in a}
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U = A - L
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print(sum(not l & u for l in L for u in U))
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# 40ms with cpython
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# 30ms with codon
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