Power of Four
Is N a power of four (1, 4, 16, 64, ...)?
Input: one integer N.
Output: YES or NO.
Constraints:
- 1 ≤ N ≤ 1018
Sample Tests
Input 1
16
Output 1
YES
Input 2
8
Output 2
NO
Discussion (opens after you solve — no spoilers before)
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