Find the first occurrence (index) of x in a sequence using C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int x;
    cin >> x;
    auto it = find(a.begin(), a.end(), x);
    cout << it - a.begin() << '\n';
    return 0;
}