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.
示例 1:
输入:n = 27
输出:true
示例 2:
输入:n = 0
输出:false
示例 3:
输入:n = 9
输出:true
示例 4:
输入:n = 45
输出:false
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