func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, p = 0;     cin >> n;     int a[2 * n], i, j;     for (i = 0; i < 2 * n; i++) cin >> a[i];     for (i = 0; i < 2 * n; i++) {       if (a[i] == a[i + 1] && a[i] != -1)         i = i + 1;       else if (a[i] != -1) {         for (j = i + 1; j < 2 * n; j++) {           if (a[j] != a[i] && a[j] != -1)             p++;           else if (a[j] != -1) {             a[j] = -1;             break;           }         }       }     }     cout << p << endl;     return 0;   }   