326 Power Of Three

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:

**Input:** n = 27
**Output:** true
**Explanation:** 27 = 33

Example 2:

**Input:** n = 0
**Output:** false
**Explanation:** There is no x where 3x = 0.

Example 3:

**Input:** n = -1
**Output:** false
**Explanation:** There is no x where 3x = (-1).

 

Constraints:

-231 <= n <= 231 - 1

 

Follow up: Could you solve it without loops/recursion?

impl Solution {
    pub fn is_power_of_three(n: i32) -> bool {

        if n == 1 {
            return true;
        }
        if n < 1 {
            return false;
        }
        if n % 3 != 0 {
            return false;
        }
        return Self::is_power_of_three(n / 3)
    }
}