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35 lines
880 B
35 lines
880 B
3 years ago
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with open("input") as file:
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startSequence = file.readline().rstrip("\n")
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file.readline()
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rulePairs = [line.split(" -> ") for line in file.read().splitlines()]
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rules = {left: right for left, right in rulePairs}
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def solve(sequence):
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pairCounts, elementCounts = {}, {}
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for a, b in zip(sequence, sequence[1:]):
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pairCounts.setdefault(a + b, 0)
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pairCounts[a + b] += 1
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for a in sequence:
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elementCounts.setdefault(a, 0)
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elementCounts[a] += 1
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for i in range(40):
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for (a, b), count in pairCounts.copy().items():
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new = rules[a + b]
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elementCounts.setdefault(new, 0)
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elementCounts[new] += count
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pairCounts.setdefault(a + new, 0)
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pairCounts[a + new] += count
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pairCounts.setdefault(new + b, 0)
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pairCounts[new + b] += count
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pairCounts[a + b] -= count
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return max(elementCounts.values()) - min(elementCounts.values())
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print(solve(startSequence))
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