oj.uz

답안 #9630

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
9630 2014-09-28T07:45:11 Z pichulia Uniting (kriii2_U) C++
0 / 4
 0 ms 3432 KB 
#include<stdio.h>
#define M 1000000007LL
int n;
long long int a[100009];
long long int f[100009];
long long int g[100009];
long long int s,t,u;
int main()
{
	scanf("%d",&n);
	long long int i,j, k;
	f[0] = 1;
	g[0] = 1;
	for(i=0;i<n;i++)
	{
		scanf("%lld",&a[i]);
		s = (s+a[i])%M;
		t = (t+a[i]*a[i])%M;
	}
	g[1] = 1;
	for(i=2;i<=n;i++)
	{
		g[i] = (g[i-1]*(i*(i-1)))%M;
	}
	u = (s*s-t)%M;
	u = (u * (M/2+1))%M;
	printf("%lld\n%lld\n",u,g[n]);
}

Subtask #1
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 3432 KB Output is correct
2 Correct 0 ms 3432 KB Output is correct
3 Correct 0 ms 3432 KB Output is correct
4 Correct 0 ms 3432 KB Output is correct
5 Incorrect 0 ms 3432 KB Output isn't correct
6 Halted 0 ms 0 KB -