Calculate Sum using Accumulate() Function using C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int sum = accumulate(a, a + n, 0);
    cout << sum << '\n';
    return 0;
}