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- #include <iostream>
- using namespace std;
- int main() {
- int testCases, N, K, V;
- scanf("%d",&testCases);
- for(int i=0; i<testCases; i++) {
- scanf("%d %d %d",&N, &K, &V);
- int nSum=0, tempVal;
- for(int j=0; j<N; j++) {
- scanf("%d", &tempVal);
- nSum += tempVal;
- }
- int interVal = (V*(N+K) - nSum);
- if((interVal > 0) && (interVal % K == 0)) {
- printf("%d\n",interVal/K);
- }else {
- printf("-1\n");
- }
- }
- return 0;
- }
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