23 lines
622 B
Python
23 lines
622 B
Python
def priority(item):
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return ord(item.lower()) - ord("a") + 1 + item.isupper() * 26
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def chunks(things, n):
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return (things[i : i + n] for i in range(0, len(things), n))
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def solve(inputstr):
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rucksacks = inputstr.splitlines()
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part1 = 0
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for rucksack in rucksacks:
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half = len(rucksack) // 2
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common = set(rucksack[:half]) & set(rucksack[half:])
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part1 += priority(common.pop())
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print(f"Part 1: {part1}")
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part2 = 0
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for r1, r2, r3 in chunks(rucksacks, 3):
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common = set(r1) & set(r2) & set(r3)
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part2 += priority(common.pop())
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print(f"Part 2: {part2}")
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