func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:100000000000000 )   using namespace std;   int n, m;   vector<pair<int, int> > ans;   int main() {     ios_base::sync_with_stdio(false);     int t;     cin >> t;     while (t--) {       ans.clear();       cin >> n >> m;       int k = 0;       for (int i = 0; i < n; i++)         for (int j = i + 1; j < n; j++) {           if (k == (2 * n + m)) {             i = n;             break;           }           k++;           ans.push_back(make_pair(i + 1, j + 1));         }       for (int i = 0; i < ans.size(); i++)         cout << ans[i].first <<     << ans[i].second << endl;     }     return 0;   }   