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<p>我们把只包含质因子 2、3 和 5 的数称作丑数Ugly Number。求按从小到大的顺序的第 n 个丑数。</p>
<p>&nbsp;</p>
<p><strong>示例:</strong></p>
<pre><strong>输入:</strong> n = 10
<strong>输出:</strong> 12
<strong>解释: </strong><code>1, 2, 3, 4, 5, 6, 8, 9, 10, 12</code> 是前 10 个丑数。</pre>
<p><strong>说明:&nbsp;</strong>&nbsp;</p>
<ol>
<li><code>1</code>&nbsp;是丑数。</li>
<li><code>n</code>&nbsp;<strong>不超过</strong>1690。</li>
</ol>
<p>注意:本题与主站 264 题相同:<a href="https://leetcode-cn.com/problems/ugly-number-ii/">https://leetcode-cn.com/problems/ugly-number-ii/</a></p>