func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, i, j, b, a, q, m;     long long int t = 1;     cin >> t;     while (t--) {       cin >> n >> m;       vector<vector<long long int>> v(n, vector<long long int>(m));       long long int f = 0;       for (i = 0; i < n; ++i) {         for (j = 0; j < m; ++j) {           cin >> v[i][j];           if (v[i][j] > 4) {             f = 1;           }         }       }       for (i = 1; i < n - 1; ++i) {         if (v[i][0] > 3 || v[i][m - 1] > 3) {           f = 1;           break;         }       }       for (j = 1; j < m - 1; ++j) {         if (v[0][j] > 3 || v[n - 1][j] > 3) {           f = 1;           break;         }       }       if (v[0][0] > 2 || v[0][m - 1] > 2 || v[n - 1][0] > 2 ||           v[n - 1][m - 1] > 2) {         f = 1;       }       if (n == 1 && v[0][0] != 0) {         f = 1;       }       if (f == 1) {         cout <<  NO               <<   n ;       } else {         cout <<  YES               <<   n ;         for (i = 0; i < n; ++i) {           for (j = 0; j < m; ++j) {             if ((i == 0 && j == 0) || (i == 0 && j == m - 1) ||                 (i == n - 1 && j == 0) || (i == n - 1 && j == m - 1)) {               cout << 2 <<    ;               continue;             }             if (i == 0 || i == n - 1 || j == 0 || j == m - 1) {               cout << 3 <<    ;               continue;             }             cout << 4 <<    ;           }           cout <<   n ;         }       }     }   }   