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
SOLUTION:
class Solution:
def isUgly(self, n: int) -> bool:
if n == 0:
return False
while n % 2 == 0:
n = n // 2
while n % 3 == 0:
n = n // 3
while n % 5 == 0:
n = n // 5
return n == 1
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