problem.md

Problem 231: Power of Two

Difficulty: Easy

Problem

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

Example

Example 1:
Input: 1
Output: true 
Explanation: 20 = 1

Example 2:
Input: 16
Output: true
Explanation: 24 = 16

Example 3:
Input: 218
Output: false