func_code_string: #include <bits/stdc++.h>   using namespace std;   const int dr[] = {-1, 0, 1, 0};   const int dc[] = {0, 1, 0, -1};   string FILE_NAME =  testcase.C ;   string NAME;   string itos(int n) {     stringstream ss;     ss << n;     return ss.str();   }   int main() {     int n, k;     cin >> n >> k;     if (k >= n * (n - 1) / 2) {       cout <<  no solution  << endl;     } else {       for (int i = 0; i < (n); i++) {         cout << 0 <<     << i << endl;       }     }     return 0;   }   