Description

The Hamming distance between two integers is the number of bit positions where the two numbers differ.

Given two integers x and y, return the Hamming distance between them.

Explanation

Compute x XOR y , count how many bits are set to 1 in the result.
（補充：XOR 中文叫「互斥或」，意思是：兩個 bit 不一樣才會是 1，一樣就是 0）

Sample Input / Output