func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long MOD = pow(10, 9) + 7;   const long long MAX = LONG_LONG_MAX;   void solve() {     int n;     cin >> n;     vector<string> a(n,   );     for (int i = 0; i < n; i += 1) cin >> a[i];     for (int i = 0; i < n; i += 1) {       for (int j = 0; j < n; j += 1) {         if (a[i][j] ==  1 ) {           if (i == n - 1 || j == n - 1) {             continue;           }           if (a[i + 1][j] ==  1  || a[i][j + 1] ==  1 ) {             continue;           } else {             cout <<  NO ;             return;           }         }       }     }     cout <<  YES ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long t = 1;     cin >> t;     while (t > 0) {       solve();       t--;       cout << endl;     }   }   