add leetcode problem-cn part2

算法题（国内版）/problem (English)/有重复字符串的排列组合(English) [permutation-ii-lcci].html

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+<p>Write a method to compute all permutations of a string whose characters are not necessarily unique. The list of permutations should not have duplicates.</p>
+
+<p><strong>Example1:</strong></p>
+
+<pre>
+<strong> Input</strong>: S = &quot;qqe&quot;
+<strong> Output</strong>: [&quot;eqq&quot;,&quot;qeq&quot;,&quot;qqe&quot;]
+</pre>
+
+<p><strong>Example2:</strong></p>
+
+<pre>
+<strong> Input</strong>: S = &quot;ab&quot;
+<strong> Output</strong>: [&quot;ab&quot;, &quot;ba&quot;]
+</pre>
+
+<p><strong>Note:</strong></p>
+
+<ol>
+	<li>All characters are English letters.</li>
+	<li><code>1 &lt;= S.length &lt;= 9</code></li>
+</ol>