2020-12-06 20:08:50 +00:00
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with open("input.txt","r") as f:
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groups = f.read().split('\n\n')
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print(
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(
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2020-12-06 22:00:49 +00:00
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sum(len(set.union(*map(set, group.splitlines()))) for group in groups), # you can just call set() directly on string, no need to call list()
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sum(len(set.intersection(*map(set, group.splitlines()))) for group in groups)
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2020-12-06 20:08:50 +00:00
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)
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)
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