My smart solution in Python using library function!Easy to understand


  • 0
    R

    as you can see.It's so convenient

    class Solution(object):
        def isPowerOfFour(self, num):
            if num<=0:
                return False
            s=bin(num)[2:]
            return len(s)%2==1 and s.count('1')<=1
    

    if num is power of four, its binary form must only include only 1 and the length of it must satisfy length%2==1.


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