[LeetCode] Hamming Distance

Posted 2020-09-27 immjc

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.

两个字码中不同位值的数目称为汉明距离(Hamming distance)，由此可得此题用XOR求解。

class Solution {
public:
    int hammingDistance(int x, int y) {
        int res = x ^ y;
        int count = 0;
        while (res) {
            if (res & 1)
                count++;
            res >>= 1;
        }
        return count;
    }
};