15 lines
225 B
Python
15 lines
225 B
Python
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def climb(num):
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a, b, c = 1, 2, 4
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for _ in range(num - 1):
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a, b, c = b, c, a + b + c
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return a
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def main():
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n = int(input('台阶数量: '))
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print(climb(n))
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if __name__ == '__main__':
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main()
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