21 lines
618 B
Python
21 lines
618 B
Python
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with open("sample.txt") as f:
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fish = [int(n) for n in f.read().split(',')]
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# note that we don't actually care about the timers themselves,
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# we just care about the total count after x days.
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#
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# technically we also care about the timer values,
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# since this directly influences the total count per daily cycle.
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from collections import Counter
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def advance(counter, days):
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for day in range(days):
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counter[(day+7)%9] += counter[day%9] # every 7 days, a new fish spawns taking 9 days.
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return sum(counter.values())
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c = Counter(fish)
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part1 = advance(c,80)
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c = Counter(fish)
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part2 = advance(c,256)
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print(part1, part2)
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