题解 | #末尾0的个数#
末尾0的个数
https://www.nowcoder.com/practice/6ffdd7e4197c403e88c6a8aa3e7a332a
import sys
n = int(input())
s=1
for i in range(1,n+1):
s = s*i
ss = str(s)
sss=ss[::-1]
for i in sss:
if i != '0':
print(sss[0:sss.index(i)].count('0'))
break
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