34 lines
615 B
Python
Executable File
34 lines
615 B
Python
Executable File
'''
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证书拆分的五边形算法
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'''
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def gen_five(limit):
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sign = -1
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n = 0
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a, b = -1, -1
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while True:
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sign = -sign
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a += 3 * n + 1
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b += 3 * n + 2
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n += 1
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if a < limit:
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yield a, sign
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else:
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break
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if b < limit:
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yield b, sign
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else:
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break
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def calc(mod):
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lst = [1, 1]
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while True:
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new = 0
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for exp, sign in gen_five(len(lst)):
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new += lst[exp] * sign
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if not new % mod:
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return len(lst)
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lst.insert(0, new % mod)
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print(calc(1000000))
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