264. Ugly Number II LeetCode Solution | Easy Approach

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Ugly Number II An ugly number is a positive integer whose prime factors are limited to 23, and 5.

Given an integer n, return the nth ugly number.

Example 1:

Input: n = 10
Output: 12
Explanation: [1, 2, 3, 4, 5, 6, 8, 9, 10, 12] is the sequence of the first 10 ugly numbers.

Example 2:

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

Constraints:

  • 1 <= n <= 1690

Ugly Number II Solutions

Time: O(n)
Space: O(n)

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