题解 | #求int型正整数在内存中存储时1的个数#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
       
        Scanner in = new Scanner(System.in);
        int we = in.nextInt();
        int i = 1;
        int z = 0;
        int sum = 0;
        while (we > i) {
            i = i * 2;
        }
        z = i/2;
        while (we>0) {
            if (we >= z) {
                we = we - z;
                sum++;
            }
            z = z / 2;
        }
        System.out.println(sum);
    }
}