func_code_string: #include <bits/stdc++.h>   using namespace std;   void reverseStr(string& str);   void reverseQueue(queue<int>& Queue);   void print_queue(queue<int>& q);   int n, a[250], sum, num;   int main() {     cin >> n;     for (int i = 0; i < n * 2; i++) cin >> a[i];     for (int i = 0; i < n * 2; i++) {       for (int j = i + 2; j < n * 2; j++) {         if (a[i] == a[j]) {           sum += j - i - 1;           for (int l = j; l > i; l--) {             swap(a[l], a[l - 1]);           }         }       }     }     cout << sum;   }   void reverseStr(string& str) {     int n = str.length();     for (int i = 0; i < n / 2; i++) swap(str[i], str[n - i - 1]);   }   void reverseQueue(queue<int>& Queue) {     stack<int> Stack;     while (!Queue.empty()) {       Stack.push(Queue.front());       Queue.pop();     }     while (!Stack.empty()) {       Queue.push(Stack.top());       Stack.pop();     }   }   void print_queue(queue<int>& q) {     while (!q.empty()) {       cout << q.front() <<    ;       q.pop();     }     cout << endl;   }   