func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     int n;     cin >> t;     for (int i = 0; i < t; i++) {       cin >> n;       int arr[2 * n];       for (int j = 0; j < 2 * n; j++) {         cin >> arr[j];       }       sort(arr, arr + 2 * n);       vector<int> left, right;       for (int j = 0; j < 2 * n; j++) {         if (j == 2 * n - 1) {           if (n % 2 == 0) {             if (j % 2 != 0)               left.push_back(arr[j]);             else               right.push_back(arr[j]);           } else {             if (j % 2 == 0)               left.push_back(arr[j]);             else               right.push_back(arr[j]);           }         } else {           if (j % 2 == 0)             left.push_back(arr[j]);           else             right.push_back(arr[j]);         }       }       cout << abs(left[left.size() / 2] - right[right.size() / 2]) <<   n ;     }     return 0;   }   