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