func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int N, K;     cin >> N >> K;     if (N * (N - 1) / 2 <= K) {       cout <<  no solution n ;       return 0;     }     for (int i = 0; i < N; ++i) cout <<  0   << i <<   n ;   }   