func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       int n, m;       cin >> n >> m;       vector<vector<int>> a(n, vector<int>(m));       map<int, vector<int>> raws;       for (int i = 0; i < n; i++) {         for (int j = 0; j < m; j++) {           cin >> a[i][j];         }         raws[a[i][0]] = a[i];       }       for (int j = 0; j < m; j++) {         for (int i = 0; i < n; i++) {           cin >> a[i][j];         }         if (raws.find(a[0][j]) != raws.end()) {           for (int i = 0; i < n; i++) {             for (int x : raws[a[i][j]]) {               cout << x <<    ;             }             cout <<   n ;           }         }       }     }     return 0;   }   