两个点
```cpp
#include<cstdio>
using namespace std;
int main(){
int n,j=1;
scanf("%d",&n);
for(int i=1;i<=n;i++){
j*=i;
if(i%5==0)
j/=10;
}
j%=10;
printf("%d",j);
return 0;
}
```
by 胖叽猪羊君 @ 2017-08-25 14:26:02
回超时的
by YangBoHang @ 2019-04-13 16:22:28