Flips to Convert
How many bits must be flipped to turn A into B?
Input: one line with two integers A and B.
Output: the number of differing bits.
Constraints:
- 0 ≤ A, B ≤ 1018
Sample Tests
Input 1
10 20
Output 1
4
Input 2
7 7
Output 2
0
Discussion (opens after you solve — no spoilers before)
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