342. Power of Four

Easy

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

Solution : More Robust

class Solution:
    def isPowerOfFour(self, n: int) -> bool:
        return n > 0 and (math.log10(n)/math.log10(4)).is_integer()

class Solution:
    def isPowerOfFour(self, n: int) -> bool:
        return n > 0 and math.log(n,4).is_integer()