[LeetCode]#231. Power of Two

Environment: Python 3.7

Key technique: Recursion

Given an integer, write a function to determine if it is a power of two.

Example 1:

Input: 1
Output: true 
Explanation: 20 = 1

Example 2:

Input: 16
Output: true
Explanation: 24 = 16

Example 3:

Input: 218
Output: false

Analysis:

Use recursion method to find value is power of two or not.

Solution:

class Solution:
    def isPowerOfTwo(self, n):
        if n == 1:
            return True
        elif n==0:
            return False        
        elif n % 2 != 0:
            return False
        else:
            return self.isPowerOfTwo(n/2)

Submitted result:

Reference:

https://leetcode.com/problems/power-of-two/discuss/546332/Python-Recursion