Given an integer n, return true if it is possible to represent n as the sum of distinct powers of three. Otherwise, return false. An integer y is a power of three if there exists an integer x such that y == 3x. Example 1: Input: n = 12 Output: true Explanation: 12 = 31 + 32 Example 2: Input: n = 91 Output: true Explanation: 91 = 30 + 32 + 34 Example 3: Input: n = 21 Output: false Constraints: 1 <= n <= 107