36 lines
666 B
C++
36 lines
666 B
C++
#include<iostream>
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#include<cstdio>
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#include<string.h>
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#define MAX 10000007
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#define LL __int64
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using namespace std;
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int n;
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LL a[MAX];
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int main()
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{
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LL t,m,i,j,sum,xx=1000000007;
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scanf("%I64d",&t);
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while(t--)
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{
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scanf("%I64d",&n);
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for(j=1; j<=n; j++)
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{
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scanf("%I64d",&a[j]);
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}
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a[0] = 0;
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for(j=1;j<=n;j++)
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{
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a[j] = a[j]*j+a[j-1];
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a[j] = a[j]%xx;
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}
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sum = 0;
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for(j=1;j<=n;j++)
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{
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sum = sum+a[j];
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sum = sum%xx;
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}
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printf("%I64d\n",sum);
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}
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return 0;
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}
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