Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).
For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011
, so the function should return 3.
class Solution(object): def hammingWeight(self, n): """ :type n: int :rtype: int """ re = 0 while n: n = n & (n-1) re += 1 return re
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