326. Power of Three

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 == 3x.

Example 1:

1 2	Input: n = 27 Output: true

Example 2:

1 2	Input: n = 0 Output: false

Example 3:

1 2	Input: n = 9 Output: true

Example 4:

1 2	Input: n = 45 Output: false

判斷某數是不是3的倍數就看他除以3餘數是不是1，並一直重複取餘數。

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