func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int main() {     cin >> n >> m;     if (m == 3 && n >= 5) {       cout << -1 << endl;       return 0;     }     for (int i = 1; i <= m; i++) {       cout << i <<     << i * i + 10000000 << endl;     }     for (int i = 1; i <= n - m; i++) {       cout << i <<     << -i * i - 10000000 << endl;     }     return 0;   }   