// Power of Two — EASY
// Category: math
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`.
**Constraints:**
- `-2³¹ <= n <= 2³¹ - 1`
Example: n = 1
Output: true