24 lines
609 B
Python
24 lines
609 B
Python
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def getStartingNumbers(filename):
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with open(filename, "r") as f:
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return [int(n) for n in f.read().split(",")]
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numbers = getStartingNumbers("input.txt")
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occurences = {n: [i] for i,n in enumerate(numbers)}
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lastNumber = numbers[-1]
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# 30000000
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targetI = 30000000
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i = len(numbers)-1
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while i+1 < targetI:
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if len(occurences[lastNumber]) > 1:
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number = occurences[lastNumber][-1] - occurences[lastNumber][-2]
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else:
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number = 0
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i += 1
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occurences[number] = occurences.get(number, [])
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occurences[number].append(i)
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occurences[number] = occurences[number][-2:]
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lastNumber = number
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print(lastNumber) |