Submission #9494

#	Time	Username	Problem	Language	Result	Execution time	Memory
9494		yukariko	Uniting (kriii2_U)	C11	1 / 4	12 ms	1360 KiB

U

#include <stdio.h>
//#include <windows.h>
 
int main()
{
    int N;
    int s[100001];
    long long cnt;
    long long sum;
    int i;
     
    cnt = 1;
    sum = 0;
     
    scanf("%d",&N);
     
    for(i=0;i<N;i++) scanf("%d",s+i);
     
    for(i=0;i<N-1;i++)
    {
        sum += s[i]*s[i+1];
        s[i+1] += s[i];
    }
    for(i=N;i>=2;i--)
    {
        cnt *= i*(i-1);
    }
    cnt = cnt%1000000007;
    printf("%lld\n",sum);
    printf("%lld\n",cnt);
    //system("pause");
    return 0;
}

• Subtask 1: 1 / 4