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263. Ugly Number

Math

Problem - Ugly Number

Easy

An ugly number is a positive integer which does not have a prime factor other than 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.

Example 3:

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

 

Constraints:

  • -231 <= n <= 231 - 1

Solutions

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class Solution:
    def isUgly(self, n: int) -> bool:
        if n < 1:
            return False
        for val in [2, 3, 5]:
            while n % val == 0:
                n //= val
        return n == 1

Submission Stats:

  • Runtime: 0 ms (100.00%)
  • Memory: 17.8 MB (69.08%)