#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
#define DUMP(x) cout << #x << " = " << (x) << endl;
#define FOR(i, m, n) for (ll i = m; i < n; i++)
#define IFOR(i, m, n) for (ll i = n - 1; i >= m; i--)
#define REP(i, n) FOR(i, 0, n)
#define IREP(i, n) IFOR(i, 0, n)
#define FOREACH(x, a) for (auto&(x) : (a))
#define ALL(v) (v).begin(), (v).end()
#define SZ(x) ll(x.size())

void solve() {
  vector<ll> a(3);
  REP(i, 3) { cin >> a[i]; }
  if (a[0] == a[1] && a[1] == a[2]) {
    // 1 1 1 -> -1
    if (a[0] <= 2) {
      cout << -1 << endl;
      return;
    }
    // 4 4 4 -> 3
    cout << 3 << endl;
    return;
  }

  // 2つ等しい
  // 2 1 2 -> -1
  // 1 2 1 -> -1
  if (a[0] == 1 && a[1] >= 2 && a[2] == 1 ||
      a[0] == 2 && a[1] == 1 && a[2] == 2) {
    cout << -1 << endl;
    return;
  }
  if (a[0] == a[2]) {
    if (a[0] == a[1] + 1) {
      // 4 3 4 -> 2
      cout << 2 << endl;
      return;
    }
    // 6 3 6 -> 1
    // 3 4 3 -> 1
    cout << 1 << endl;
    return;
  }
  // 全部異なる
  // 1 4 3
  // 4 2 3
  if (a[1] > a[0] && a[1] > a[2] || a[1] < a[0] && a[1] < a[2]) {
    cout << 0 << endl;
    return;
  }
  // minが1だとだめ
  ll mini = 1e18;
  REP(i, 3) { mini = min(mini, a[i]); }
  if (mini == 1) {
    cout << -1 << endl;
    return;
  }
  cout << a[1] - mini + 1 << endl;
}

int main() {
  ll n;
  cin >> n;
  while (n--) solve();
}