1003 阶乘后面0的数量

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 #define N 504
 5 #define mem(a) memset(a,0,sizeof(a))
 6 using namespace std;
 7 int main(){
 8     int n;
 9     scanf("%d",&n);
10     int a=0;
11     while(n){
12         a+=n/5;
13         n=n/5;
14     }
15 
16     cout<<a<<endl;
17     return 0;
18 }