Power of Two
Is N a power of two (1, 2, 4, 8, ...)?
Input: one integer N.
Output: YES or NO.
Constraints:
- 0 ≤ N ≤ 1018
Sample Tests
Input 1
64
Output 1
YES
Input 2
6
Output 2
NO
Discussion (opens after you solve — no spoilers before)
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