func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n;     if (n % 2 == 1)       m = (n / 2) * (n / 2 + 1);     else       m = (n / 2) * (n / 2);     cout << m << endl;     for (int i = 1; i <= n / 2; i++) {       for (int j = n / 2 + 1; j <= n; j++) {         cout << i <<     << j << endl;       }     }     return 0;   }   