[Solved] 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.

Question

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

Example 2:

Input: n = 16
Output: true
Explanation: 24 = 16

Example 3:

Input: n = 3
Output: false

Constraints:

• -231 <= n <= 231 - 1

 Follow up: Could you solve it without loops/recursion?

Python Solution

class Solution:
    def isPowerOfTwo(self, n: int) -> bool:
        if n<=0:
            return False
        while n>0:
            if n==1:
                return True
            elif n%2==0:
                n/=2
            else:
                return False