Check if n is a Power of 2 using popcount in C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    if (__builtin_popcount(n) == 1) {
        cout << "Yes";
    } else {
        cout << "No";
    }
    cout << '\n';
    return 0;
}