Given an integer n, return true if n is a power of three (that is, n equals 3 raised to some non-negative integer power). Return false for null, zero, or negative values.
Example 1:
Input: n = 27
Output: true
Explanation: 27 equals 3 raised to the power 3, so it is a power of three.
Example 2:
Input: n = 1
Output: true
Explanation: 1 equals 3 raised to the power 0, so it is a power of three.
Example 3:
Input: n = 10
Output: false
Explanation: 10 cannot be expressed as 3 raised to any non-negative integer, so it is not a power of three.
Example 4:
Input: n = 0
Output: false
Explanation: Zero is not a power of three.
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