func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     int n, m;     cin >> m >> n;     map<int, vector<pair<int, int>>> matrix;     vector<int> cnt(n, m), mag(m, n);     int cnt2 = m;     for (int i = 0; i < m; ++i) {       for (int j = 0; j < n; ++j) {         int a;         cin >> a;         matrix[a].push_back(make_pair(j, i));       }     }     int ans = -1;     for (auto &elem : matrix) {       ans = elem.first;       bool ok = 1;       for (auto &pr : elem.second) {         int i = pr.first, j = pr.second;         --cnt[i];         --mag[j];         if (cnt[i] == 0) {           ok = 0;           break;         }         if (mag[j] == 1) --cnt2;       }       if (!ok || cnt2 == 0) break;     }     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(0);     cout.tie(0);     cin.tie(0);     srand(time(NULL));     int tt = 1;     cin >> tt;     while (tt--) solve();     return 0;   }   