func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int test;     cin >> test;     while (test--) {       int n;       cin >> n;       vector<vector<int>> v(n, vector<int>(n, 0));       for (int i = 0; i < n; i++) {         v[i][i] = 1;         v[(i + 1) % n][i] = 1;       }       for (int i = 0; i < n; i++) {         for (int j = 0; j < n; j++) cout << v[i][j] <<    ;         cout <<   n ;       }     }   }   