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