func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     cout << (n * n) / 4 << endl;     for (int i = 1; i <= n / 2; i++) cout << n <<     << i << endl;     for (int i = 1; i <= n / 2; i++)       for (int j = n / 2 + 1; j < n; j++) cout << i <<     << j << endl;   }   