Flip Bit K
Print N with bit K (0-indexed) flipped.
Input: one line with two integers N and K.
Output: N ⊕ 2K.
Constraints:
- 0 ≤ N ≤ 1018
- 0 ≤ K ≤ 62
Sample Tests
Input 1
10 0
Output 1
11
Input 2
10 1
Output 2
8
Discussion (opens after you solve — no spoilers before)
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