| #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; |
| } |
|
|
