Submission #18559

#	Time	Username	Problem	Language	Result	Execution time	Memory
18559		eaststar	Uniting (kriii2_U)	C++14	4 / 4	13 ms	1084 KiB

U

#include <stdio.h>
#define M 1000000007
int main(){
    int i,n,k;
    long long ans=0,cnt=1,s=0;
    scanf("%d",&n);
    for(i=1;i<=n;++i){
        scanf("%d",&k);
        ans+=s*k;
        s+=k;
        cnt=cnt*i%M;
        if(i<n)cnt=cnt*i%M;
    }
    printf("%lld\n%lld",ans,cnt);
    return 0;
}

• Subtask 1: 4 / 4