Number of 1 Bits

阿新 • • 發佈：2018-12-14

Number of i Bits

Write a function that takes an unsigned integer and returns the number of ‘1’ bits it has (also known as the Hamming weight).

Example

Input: 11 Output: 3 Explanation: Integer 11 has binary representation 00000000000000000000000000001011 Input: 128 Output: 1 Explanation: Integer 128 has binary representation 00000000000000000000000010000000

Solution

class Solution(object):
    def hammingWeight(self, n):
        """
        :type n: int
        :rtype: int
        """
        count = 0
        while n:
            count += 1
            n &= n-1
        return count

Result Result

191. Number of 1 Bits（LeetCode）

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