UglyNumber263.kt

package easy

/**
 * An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5.

Given an integer n, return true if n is an ugly number.



Example 1:

Input: n = 6
Output: true
Explanation: 6 = 2 × 3
Example 2:

Input: n = 1
Output: true
Explanation: 1 has no prime factors, therefore all of its prime factors are limited to 2, 3, and 5.
Example 3:

Input: n = 14
Output: false
Explanation: 14 is not ugly since it includes the prime factor 7.


Constraints:

-231 <= n <= 231 - 1
 */
fun isUgly(n: Int): Boolean {
    if (n <= 0) return false

    var num = n
    val dividers = intArrayOf(2, 3, 5)

    dividers.forEach { divider ->

        while (num % divider == 0)
            num /= divider
    }

    return num == 1
}