蓝桥杯算法提高VIP-数字黑洞

解题思路:

注意事项:

参考代码:

n = input()

s = 0

while n != '6174':

    a = ''.join(sorted(n)[::-1])

    b = a[::-1]

    if '0'in b:

        b = b.replace('0','')

    n = str(int(a)-int(b))

    s+=1

print(s)