60 lines
1.2 KiB
Python
Executable File
60 lines
1.2 KiB
Python
Executable File
import time
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from functools import reduce
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def factorial(n, multi=1):
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if 1 == n:
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return multi
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else:
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return factorial(n - 1, multi * n)
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def jump(num):
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if 9 > num % 10:
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return 1
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else:
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num += 1
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offset = 0
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while not num % 10:
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num //= 10
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offset += 1
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return 1 + (10 ** offset - 1) // 9 * (num % 10)
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def gen_pick(digit):
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maxi = 10 ** (digit + 1) - 1
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num = maxi // 9
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while num < maxi:
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yield num
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num += jump(num)
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yield maxi
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def judge(num):
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while True:
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a = 0
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while num != 0:
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a += (num % 10) ** 2
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num //= 10
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if a == 1:
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return False
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elif a == 89:
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return True
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else:
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num = a
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def count(limit, s_num):
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total = 1
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for i in range(len(s_num)):
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total *= (limit - i)
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for ch in set(list(s_num)):
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total //= factorial(s_num.count(ch))
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return total
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def statistic(limit):
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total = 0
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for digit in range(limit):
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for num in gen_pick(digit):
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if judge(num):
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total += count(limit, str(num))
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return total
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print(statistic(7))
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print(time.process_time())
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