#include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     for (int i = 0; i < n; ++i) {       for (int x = 0; x < n; ++x)         if (i == x)           cout << k <<    ;         else           cout << 0 <<    ;       cout << endl;     }   }   