题解 | #查找输入整数二进制中1的个数#n&(n-1)用于消掉最右边的1

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
        int n=sc.nextInt();
        int count=0;
        while(n>0){
            n=n&(n-1);
            count++;
        }
        System.out.println(count);
        }
        
    }
}