Check if Number is a Sum of Powers of Three

Difficulty

Medium

Question

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 = 3^1 + 3^2

Example 2:

Input: n = 91
Output: true
Explanation: 91 = 3^0 + 3^2 + 3^4

Example 3:

Input: n = 21
Output: false

Constraints:

1 <= n <= 107

Link

Check if Number is a Sum of Powers of Three

Solution

Solution checks for 2 in ternary n representation.