#include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int a, b, c;       cin >> a >> b >> c;       if (a > b) swap(a, b);       int mx = (b - a) * 2;       if (a > mx || b > mx || c > mx)         cout <<  -1 n ;       else {         if (c > mx / 2)           cout << c - mx / 2 <<   n ;         else           cout << c + mx / 2 <<   n ;       }     }     return 0;   }   