'''
Description: 
Autor: Au3C2
Date: 2021-03-22 15:30:57
LastEditors: Au3C2
LastEditTime: 2021-03-22 15:31:18
'''
class Solution:
    def hammingWeight(self, n: int) -> int:
        return bin(n).count("1")

# 位运算，简单
# https://leetcode-cn.com/problems/number-of-1-bits/