326. Power of Three

Easy

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250

Given an integer `n`

, return * true if it is a power of three. Otherwise, return false*.

An integer `n`

is a power of three, if there exists an integer `x`

such that `n == 3`

.^{x}

**Example 1:**

Input:n = 27Output:trueExplanation:27 = 3^{3}

**Example 2:**

Input:n = 0Output:falseExplanation:There is no x where 3^{x}= 0.

**Example 3:**

Input:n = -1Output:falseExplanation:There is no x where 3^{x}= (-1).

**Constraints:**

`-2`

^{31}<= n <= 2^{31}- 1

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