Power of Four

EasyMathBit ManipulationRecursion

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 == 4^x.

Example 1:

Input: n = 16
Output: true

Example 2:

Input: n = 5
Output: false

Example 3:

Input: n = 1
Output: true

Constraints:

Follow up: Could you solve it without loops/recursion?

Example 1

Input: 16

Output: true

Example 2

Input: 5

Output: false

Example 3

Input: 1

Output: true

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Input:

Expected Output:

true

Power of Four