#231. Power of Two

#Given an integer n, return true if it is a power of two. Otherwise, return false.

#An integer n is a power of two, if there exists an integer x such that n == 2x.

 

#Example 1:

#Input: n = 1
#Output: true
#Explanation: 20 = 1

class Solution:
    def isPowerOfTwo(self, n: int) -> bool:
        if n<=0: return False
        if n<=2: return True
        if n%2!=0: return False
        else: return self.isPowerOfTwo(n/2)
        