#include <bits/stdc++.h>   using namespace std;   void solve() {     long long a, b;     cin >> a >> b;     if (a == 0 || b == 0) {       cout << 0 << endl;       return;     }     cout << min((a + b) / 3, min(a, b)) << endl;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     int tc = 1;     cin >> tc;     while (tc--) solve();   }   