Formatted question description: https://leetcode.ca/all/461.html

461. Hamming Distance

Level

Easy

Description

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.

Solution

Compare corresponding bits of x and y directly. If the bits are different, add the Hamming distance by 1. Finally, return the Hamming distance.

Java

class Solution {
    public int hammingDistance(int x, int y) {
        if (x == y)
            return 0;
        int distance = 0;
        while (x > 0 || y > 0) {
            int xBit = x & 0x1, yBit = y & 0x1;
            if (xBit != yBit)
                distance++;
            x >>>= 1;
            y >>>= 1;
        }
        return distance;
    }
}

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