func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, swaps = 0;     vector<int> seq;     cin >> n;     seq.resize(n * 2);     for (int i = 0; i < n * 2; i++) cin >> seq[i];     for (int i = 0; i < 2 * n - 1; i += 2) {       int j = i + 1;       while (seq[j] != seq[i]) j++;       for (int k = j; k > i + 1; k--) {         swap(seq[k - 1], seq[k]);         swaps++;       }     }     cout << swaps << endl;   }   