Flip Bits

Determine the number of bits required to flip if you want to convert integer n to integer m.

Notice

Both n and m are 32-bit integers.

Example

Given n = 31 (11111), m = 14 (01110), return 2.

 class Solution {
     /**
      *@param a, b: Two integer
      *return: An integer
      */
     public static int bitSwapRequired(int a, int b) {
         // write your code here
         int diff = a ^ b;
         int count = ;
         while (diff != ) {
             count++;
             // remove the last 1
             diff = diff & (diff - );  // 这种方法很好。
         }
         return count;
     }
 };