Leetcode 342. Power of Four
Given an integer (signed 32 bits), write a function to check whether it is a power of 4.Example 1:
Input: 16
Output: true
Example 2:
Input: 5
Output: false
Follow up: Could you solve it without loops/recursion?
class Solution:
def isPowerOfFour(self, num: int) -> bool:
if num <= 0: return False
return math.log(num) / math.log(4) % 1 == 0
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