func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       long long n, m;       cin >> n >> m;       long long a[n][m], f1 = 0;       for (long long i = 0; i < n; i++) {         for (long long j = 0; j < m; j++) {           cin >> a[i][j];           if (a[i][j] > 4) f1 = 1;         }       }       if (f1) {         cout <<  NO  << endl;         continue;       }       for (long long i = 0; i < n; i++) {         for (long long j = 0; j < m; j++) {           long long c = a[i][j];           if ((i == 0 && j == 0) || (i == 0 && j == m - 1) ||               (i == n - 1 && j == m - 1) || (i == n - 1 && j == 0)) {             if (c > 2)               f1 = 1;             else               a[i][j] = 2;           } else if ((i == n - 1 || i == 0 || j == 0 || j == m - 1)) {             if (a[i][j] > 3)               f1 = 1;             else               a[i][j] = 3;           } else             a[i][j] = 4;         }       }       if (f1) {         cout <<  NO  << endl;         continue;       } else {         cout <<  YES  << endl;         for (long long i = 0; i < n; i++) {           for (long long j = 0; j < m; j++) {             cout << a[i][j] <<    ;           }           cout << endl;         }       }     }     return 0;   }   