Goals of Victory

c++

#include<bits/stdc++.h>
using namespace std;

int main() {
   int t;cin>>t;
   while (t--)
   {
        int n,sum=0;cin>>n;
        vector<int>v(n-1);
        for(int i=0;i<n-1;i++)
        {
            cin>>v[i];
            sum+=v[i];
        }
        sum = -sum;
        cout<<sum<<endl;
   }
   
   return 0;
}