携程第一题 统计1的数目

#include<iostream>
using namespace std;
int NumberOf1(long n) {
    int count = 0;
    while (n != 0) {
        count++;
        n = n & (n - 1);
    }
    return count;
}
int main(void) {
    long N;
    cin >> N;
    cout << NumberOf1(N);
}

#携程#