func_code_string: #include <bits/stdc++.h>   using namespace std;   long long mp[1005][1005];   long long n, a, b;   void output() {     for (long long i = 1; i <= n; i++) {       for (long long j = 1; j <= n; j++) {         if (i == j)           printf( 0 );         else           printf( %lld , a < b ? !mp[i][j] : mp[i][j]);       }       printf(  n );     }   }   int main() {     scanf( %lld%lld%lld , &n, &a, &b);     long long root = 2;     if ((a != 1 && b != 1)) {       printf( NO n );       return 0;     }     if (n == 2 && a == 1 && b == 1) {       printf( NO n );       return 0;     }     if (n == 3 && a == 1 && b == 1) {       printf( NO n );       return 0;     }     printf( YES n );     if (a == 1 && b == 1)       for (long long i = 1; i < n; i++) mp[i][i + 1] = mp[i + 1][i] = true;     else       for (long long i = 0; i < n - max(a, b); i++, root++)         mp[1][root] = mp[root][1] = true;     output();   }   