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#include<stdio.h>
#include<iostream>
#include<cmath>
#include<algorithm>
#include<cstring>
#include<map>
#include<set>
#include<vector>
#include<utility>
#include<math.h>
#define sd(x) scanf("%d",&x);
#define sd2(x,y) scanf("%d %d",&x,&y);
#define sd3(x,y,z) scanf("%d %d %d",&x,&y,&z);
#define sull(x) scanf("%ull",&x);
#define print(x) printf("%d\n",x);
#define print2(x,y) printf("%d %d\n",x,y);
#define print3(x,y,z) printf("%d %d %d\n",x,y,z);
#define printull(x) printf("%ull\n",x);
using namespace std;
int main(){
int t, n, fact;
long long nums[10000], sum[10000], total;
sd(t);
while(t--){
sd(n);
if(n == 0 or n == 1){
printf("0\n");
continue;
}
for(int i = 0; i < n; i++){
scanf("%lld",&nums[i]);
}
sum[n-1] = nums[n-1];
for(int i = n-2; i >= 0; i--){
sum[i] = sum[i+1] + nums[i];
}
total = 0;
for(int i = 0; i < n-1; i++){
total += abs((n-i-1)*nums[i] - sum[i+1]);
}
printf("%lld\n",total);
}
return 0;
}
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