func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n, m;       cin >> n >> m;       vector<vector<int>> p(n + 1, vector<int>(m + 1, 0));       vector<int> ma(m + 1);       for (int i = 1; i <= n; i++)         for (int j = 1; j <= m; j++) {           cin >> p[i][j];           if (p[i][j] > p[ma[j]][j]) ma[j] = i;         }       set<int> s;       for (int i = 1; i <= m; i++) s.insert(ma[i]);       if (s.size() == m) {         int ans = 0;         for (int i = 1; i <= m; i++) {           for (int j = 1; j <= m; j++) {             if (i == j) continue;             int tem = 0;             for (int k = 1; k <= n; k++) {               tem = max(tem, min(p[k][i], p[k][j]));             }             for (int k = 1; k <= m; k++) {               if (k == i || k == j) continue;               tem = min(tem, p[ma[k]][k]);             }             ans = max(ans, tem);           }         }         cout << ans <<   n ;       } else {         int ans = 1e9;         for (int i = 1; i <= m; i++) {           ans = min(ans, p[ma[i]][i]);         }         cout << ans <<   n ;       }     }     return 0;   }   