7 lines
409 B
Python
7 lines
409 B
Python
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import re
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lines = [l for l in open("input", "r").read().split("\n") if l]
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baglines = [l.split(" bags contain ") for l in lines]
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rules = {bag: [re.match("(\d) (.*) bag", c).group(2) for c in contains.split(", ") if c != "no other bags."] for (bag, contains) in baglines}
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contain = lambda b: {b}.union(*[contain(bag) for (bag, contains) in rules.items() if b in contains])
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print(len(contain("shiny gold")) - 1)
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