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 == 2^x.
Follow up: Could you solve it without loops/recursion?
Example 1
Input
n = 1Output
true2^0 = 1.
Example 2
Input
n = 16Output
true2^4 = 16.
Constraints
- -2^31 <= n <= 2^31 - 1
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