easyBit ManipulationMathRecursion 0 views
Power of Four
Given an integer n, return true if it is a power of four.
Given an integer n, return true if it is a power of four. Otherwise, return false.
An integer n is a power of four, if there exists an integer x such that n == 4x.
Example 1
Input: n = 16
Output: true
Example 2
Input: n = 5
Output: false
Example 3
Input: n = 1
Output: true
Constraints
- -231 <= n <= 231 - 1
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