Giúp mình với, sử dụng C/C++ nha

#include <bits/stdc++.h>
using namespace std;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    freopen("timx.inp","r",stdin);
    freopen("timx.out","w",stdout);
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) cin >> a[i];
    sort(a.begin(), a.end());
    if (n & 1) cout << a[(n - 1) / 2];
    else cout << a[(n - 2) / 2];
    return 0;
}

#include<bits/stdc++.h>
#define ll long long
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#pragma GCC optimize("O3","unroll-loops")
#pragma GCC optimize("Ofast")
using namespace std;
const ll N=1e6+100;
ll a[N];
int main() {
    ios
    ll n;
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>a[i];
    sort(a,a+n);
    if(n%2==1)
        cout<<a[(n-1)/2];
    else
        cout<<a[(n/2)-1];
    return 0;
}