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

void solve() {
	const int64_t INF = 1e18;
	int64_t a, b, c; cin >> a >> b >> c;
	int64_t ans = INF;
	// b = max
	if(b >= 3 and not(a == 1 and c == 1)) {
		if(a == c) {
			ans = min<int64_t>(ans, max<int64_t>(0, a - (b - 1)) + 1);
		} else {
			ans = min<int64_t>(ans, max<int64_t>(0, a - (b - 1)) + max<int64_t>(0, c - (b - 2)));
			ans = min<int64_t>(ans, max<int64_t>(0, a - (b - 2)) + max<int64_t>(0, c - (b - 1)));
		}
	}
	// b = min
	if(not (a == 1 or c == 1) and (a > 2 or c > 2)) {
		if(a == c) {
			ans = min<int64_t>(ans, max<int64_t>(0, b - (a - 2)) + 1);
		} else {
			ans = min<int64_t>(ans, max<int64_t>(0, b - (min<int64_t>(a, c) - 1)));
		}
	}
	cout << (ans == INF ? -1 : ans) << '\n';
}

int main() {
	int t; cin >> t;
	while(t--) {
		solve();
	}
	return 0;
}