leetcode-problemset/leetcode-cn/problem (Chinese)/有重复字符串的排列组合 [permutation-ii-lcci].html

<p>有重复字符串的排列组合。编写一种方法，计算某字符串的所有排列组合。</p>

<p><strong>示例 1：</strong></p>

<pre>
<strong> 输入</strong>：S = "qqe"
<strong> 输出</strong>：["eqq","qeq","qqe"]
</pre>

<p><strong>示例 2：</strong></p>

<pre>
<strong> 输入</strong>：S = "ab"
<strong> 输出</strong>：["ab", "ba"]
</pre>

<p><strong>提示:</strong></p>

<ol>
	<li>字符都是英文字母。</li>
	<li>字符串长度在[1, 9]之间。</li>
</ol>