func_code_string: #include <bits/stdc++.h>   int main() {     int count;     std::vector<int> visitors;     std::cin >> count;     for (int i = 0; i < 2 * count; ++i) {       int value;       std::cin >> value;       visitors.push_back(value);     }     int counter = 0;     for (int i = 0; i < 2 * count; i += 2) {       if (visitors[i] != visitors[i + 1]) {         for (int j = 2 * count - 1; j > i + 1; j--) {           if (visitors[j] == visitors[i]) {             for (int k = j; k > i + 1; k--) {               std::swap(visitors[k], visitors[k - 1]);               counter++;             }             break;           }         }       }     }     std::cout << counter << std::endl;     return 0;   }   