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add leetcode problem-cn part6

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<p>给你一个整数 <code>n</code> ,请你找出并返回第 <code>n</code><strong>丑数</strong></p>
<p><strong>丑数 </strong>就是只包含质因数 <code>2</code><code>3</code> 和/或 <code>5</code> 的正整数。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>n = 10
<strong>输出:</strong>12
<strong>解释:</strong>[1, 2, 3, 4, 5, 6, 8, 9, 10, 12] 是由前 10 个丑数组成的序列。
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>n = 1
<strong>输出:</strong>1
<strong>解释:</strong>1 通常被视为丑数。
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 <= n <= 1690</code></li>
</ul>