322. Power of Four
EasyBits
Print YES if n is a power of four, else NO.
Input format
A single integer n.
Output format
YES or NO
Example 1
Input
16
Output
YES
Example 2
Input
5
Output
NO
Constraints
−2³¹ ≤ n < 2⁶²
Read input from standard input and print the answer to standard output. Your code is judged against 6 test cases, most of them hidden.
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