#include <bits/stdc++.h>   using namespace ::std;   int main() {     int n, m;     cin >> n;     int ara[2 * n + 7];     for (int i = 0; i < 2 * n; i++) {       cin >> ara[i];     }     sort(ara, ara + (2 * n));     if (ara[n - 1] == ara[n]) {       cout <<  NO ;     } else {       cout <<  YES ;     }   }   