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.
Examples
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
342. Power of Four
Easy
10 Points
Math
Bit Manipulation
Recursion
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.