func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int t;     cin >> t;     while (t--) {       long long int n, i, j;       cin >> n;       long long int arr[n][n];       for (i = 0; i < n; i++) {         string s;         cin >> s;         for (j = 0; j < n; j++) {           long long int temp;           temp = s[j] - 48;           arr[i][j] = temp;         }       }       int flag = 1;       for (i = 0; i < n; i++) {         for (j = 0; j < n; j++) {           if (arr[i][j] == 1) {             if (j != n - 1 && i != n - 1) {               if (arr[i + 1][j] != 1 && arr[i][j + 1] != 1) {                 flag = 0;                 break;               }             }           }         }         if (flag == 0) break;       }       if (flag == 1) {         cout <<  YES n ;       } else {         cout <<  NO n ;       }     }   }   