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