Code C++ giúp tui plss

#include <bits/stdc++.h>
using namespace std;
int main()
{

    int n; cin >> n;
    int a[n], s = 0;
    for (int i = 0 ; i < n; i ++)
    {
        cin >> a[i];
        s += a[i];
    }
    cout << s;
}

Chúc bn học tốt!

$\color{Red}{\triangleright \triangleright\ \color{ Red}{\text{ThienPhuc123} \triangleleft \triangleleft}}$

#include <bits/stdc++.h>

using namespace std;

int main()

{

    int n, a[n], tong = 0; cin >> n;    

    for (int i = 0 ; i < n; i ++)

    {

        cin >> a[i];

        tong += a[i];

    }

    cout << tong;

}