func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     for (int k = 0; k < t; k++) {       int n, m;       cin >> n >> m;       vector<vector<int>> a(max(n, m), vector<int>(max(n, m)));       vector<vector<int>> id(n * m, vector<int>(2));       vector<vector<int>> c(n, vector<int>(m));       for (int i = 0; i < n; i++) {         for (int j = 0; j < m; j++) {           cin >> a[i][j];           id[a[i][j] - 1][1] = j;         }       }       for (int i = 0; i < m; i++) {         for (int j = 0; j < n; j++) {           cin >> a[i][j];           id[a[i][j] - 1][0] = j;         }       }       for (int k = 0; k < n * m; k++) {         int i = id[k][0], j = id[k][1];         c[i][j] = k + 1;       }       for (int i = 0; i < n; i++) {         for (int j = 0; j < m; j++) {           cout << c[i][j] <<    ;         }         cout <<   n ;       }     }   }   