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