Leetcode 461 Hamming Distance 自制答案

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 ≤ xy < 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.

答案描述上来说,就是找出两个数的异或位的个数。

leetcode上有个别人写的一行代码,就是直接借助了Integer库的方法,当然我是想不到的啦。

public class Solution {
    public int hammingDistance(int x, int y) {
        return Integer.bitCount(x ^ y);
    }
}

自己写的算法在下面,就是进行位操作。

每次比较最后一位,然后对两组数进行右移操作,直到最大的那个数等于0为止。

public class Solution {
    public int hammingDistance(int x, int y) {
        int hamDistance = 0;
        
        while((x>0)||(y>0)){
            if((x&1)!=(y&1)){
                hamDistance++;
            }
            x=x>>>1;
            y=y>>>1;
        }
    return hamDistance;
    }
}

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