12.Hamming Distance（汉明距离）

2024-09-03 04:41:38

Level：

Easy

题目描述：

The Hamming distance between two integers is the number of positions at which the corresponding bits are different.

Given two integers x and y, calculate the Hamming distance.

Note:

0 ≤ x, y < 231.

Example:

Input: x = 1, y = 4

Output: 2

Explanation:

1   (0 0 0 1)

4   (0 1 0 0)

       ↑   ↑

The above arrows point to positions where the corresponding bits are different.

思路分析：

汉明距离指的是两个数的二进制形式中对应位数值不同的数目。因此我们将两个数相异或，那么异或结果的二进制形式中非零位的个数就是汉明距离。

代码：

class Solution {

    public int hammingDistance(int x, int y) {

        int xor=(x^y);

        int t=1;

        int res=0;

        while(t>0){

            if((xor&t)!=0)

                res++;

            t<<=1;

        }

        return res;

    }

}

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