#include<stdio.h>
#include<stdlib.h>
int main()
{
long long int t, n, i;
scanf("%lld", &t);
while(t--)
{
scanf("%lld", &n);
long long int d, grass=0;
for(i=1; i<=n; i++)
{
scanf("%lld", &d);
grass+=(d*i);
}
grass=abs(grass);
printf("%lld\n", grass);
}
return 0;
}
/*
Test1:
Input:
5
2 -5 -2 -1 6
Output:
16
=============================================
Test 2:
Input:
12
-51 -22 56 -9 47 -59 99 -61 0 -191 999 -808
Output:
1286
============================================
Test3:
Input:
9
-15 3 -7 24 -19 17 -5 3 -1
Output:
71
=========================================
Test4:
Input:
19
51 -999 474 -14 -21 -764 41 -42 -64 -99 -444 -616 1111 -63 1201 6666
Output:
17464
====================================================
Test5:
Input:
6
-91555 -45617 75642 -66454 12345 115639
Output:
533880
===================================================
Test6:
Input:
7
9494 1427 -6479 4976 -12465 6654 -3607
Output:
40929
*/
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Ngo1CjIgLTUgLTIgLTEgNgoxMgotNTEgLTIyIDU2IC05IDQ3IC01OSA5OSAtNjEgMCAtMTkxIDk5OSAtODA4CjkKLTE1IDMgLTcgMjQgLTE5IDE3IC01IDMgLTEKMTkKNTEgLTk5OSA0NzQgLTE0IC0yMSAtNzY0IDQxIC00MiAtNjQgLTk5IC00NDQgLTYxNiAxMTExIC02MyAxMjAxIDY2NjYgCjYKLTkxNTU1IC00NTYxNyA3NTY0MiAtNjY0NTQgMTIzNDUgMTE1NjM5CjcKOTQ5NCAxNDI3IC02NDc5IDQ5NzYgLTEyNDY1IDY2NTQgLTM2MDc=
6
5
2 -5 -2 -1 6
12
-51 -22 56 -9 47 -59 99 -61 0 -191 999 -808
9
-15 3 -7 24 -19 17 -5 3 -1
19
51 -999 474 -14 -21 -764 41 -42 -64 -99 -444 -616 1111 -63 1201 6666
6
-91555 -45617 75642 -66454 12345 115639
7
9494 1427 -6479 4976 -12465 6654 -3607