#342
Power of Four
easy · verified · 51.8% accepted · 4,465 likes · top 41%
math · bit manipulation · recursion
Description
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
Solution