func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, count = 0;     cin >> n;     int home[n], guest[n];     for (int i = 0; i < n; ++i) {       cin >> home[i] >> guest[i];     }     for (int i = 0; i < n; ++i) {       for (int j = 0; j < n; ++j) {         if (home[i] == guest[j]) count++;       }     }     cout << count;   }   