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

void solve() {
    int64_t a, b, c, ans = 0;
    cin >> a >> b >> c;
    if (a > c) swap(a, c);
    if (a == c) {
        a--;
        ans++;
    }
    if (a == 0) {
        cout << -1 << endl;
        return;
    }
    if (a > b || b > c) {
        cout << ans << endl;
        return;
    }
    if (a == 1) {
        cout << -1 << endl;
        return;
    }
    if (c - a == 1) {
        cout << ans + b - a + 1 << endl;
        return;
    }
    cout << min(b - a, c - b) + ans + 1 << endl;
    return;
}

int main() {
    int t;
    cin >> t;
    for (int i = 0; i < t; i++) solve();
}