#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N = 2e5 + 9;
const int mod = 1e9 + 7;
#define eps 1e-5
#define inf 2e18
ll a, b, c;



void solve()
{
    cin >> a >> b >> c;

    ll k = a + b - c;
    if (k < 0)
    {
        cout << "-1" << '\n';
        return;
    }
    else if (k == 0) {
        cout << a + b + 1 << endl;
    }
    else {
        cout << k*k << '\n';
    }

    

}

int main()
{
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int _ = 1; cin >> _;
    while (_--) solve();
    return 0;
}