Hamming Distance

The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, return the Hamming distance between them.

Example 1:

              
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.

Example 2:

              
Input: x = 3, y = 1
Output: 1

Calculate the hamming distance between two integers x and y.