C++ 解法, 执行用时: 1ms, 内存消耗: 228KB, 提交时间: 2017-07-24

#include<iostream>
using namespace std;
int main()
{
	int num;
	while (cin >> num)
	{
		int count = 0;
		while (num)
		{
			num = (num - 1)&num;
			count++;
		}
		cout << count<<endl;
	}
	return 0;
}

C 解法, 执行用时: 1ms, 内存消耗: 256KB, 提交时间: 2020-07-07

#include <stdio.h>
int main()
{
    int a;
    int count = 0;
    while (scanf("%d", &a) != EOF) {
        while (a) {
            a &= (a - 1);
            count++;
        }
        printf("%d\n", count);
        count = 0;
    }
    return 0;
}