Power of Four
Easy
You receive an integer n, provide true if it is a power of four. Otherwise, provide false.
An integer n is a power of four, if there exists an integer x such that n == 4^x.
Example 1
Input: n = 16
Output: true
Example 2
Input: n = 5
Output: false
Example 3
Input: n = 1
Output: true
Constraints
-2^31<= n <= 2^31- 1
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