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Diff for: 016Hamming_Distance.py

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# encoding:utf-8
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#
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# Algorithm function:
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# The Hamming distance between two integers is the number of positions at which the corresponding bits are different.
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# Input:
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# x = 1, y = 4
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# Output:
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# 2
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#
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class Solution:
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def hammingDistance(self, x, y):
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xor = x ^ y #按位异或运算符:当两对应的二进位相异时,结果为1
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count = 0
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while xor > 0: #当且仅当x与y所对应的二进制的数值存在异位时,才做如下判断。
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if xor & 1: #结果为非零时成立
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count += 1
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xor = xor >> 1 #右移动运算符(即对其二进制的数据每次更新时去掉右数第一个元素)
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return count
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if __name__ =="__main__":
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a = Solution().hammingDistance(4,10)
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print(a)
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#算法思路
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#首先通过位异或符(^)计算出两个整数的差异xor;
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#其次通过将差异xor与整数1做位与运算符(&),即:当其结果为非0时,差异项数(count)加一。
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#之后,通过右移动运算符(>>)将xor按位依次与整数1做比较,直至xor小于0时,循环结束。
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#小结:其实整个算法最关键的是:通过位异或符(^)计算出两者差异xor后如何确定差异个数?
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#关于Hamming Distance的介绍:https://en.wikipedia.org/wiki/Hamming_distance

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