题解 | #字符串排序#

运用位运算

#include <stdio.h>

int main(void)
{
    int num;
    unsigned int cnt = 0;
    scanf("%d", &num);
    while(num)
    {
        if(num & 0x1)
        cnt++;
        num >>= 1;
    }
    printf("%d\n", cnt);
    return 0;
}