luogu_1134 阶乘问题

Posted 2020-10-09 Code_Together

#include <cstdio>
using namespace std;
int n;
long long ans=1;

int main(){
    scanf("%d",&n);
    for(register int i=1;i<=n;i++){
        ans*=i;
        while(ans%10==0)ans/=10;
        ans%=100000000;
    }
    printf("%lld\n",ans%10);
    return 0;
}