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add leetcode problem-cn part6

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2022-03-27 20:56:26 +08:00
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<p>给定一个字符串 <em><strong>s</strong></em>,你可以通过在字符串前面添加字符将其转换为回文串。找到并返回可以用这种方式转换的最短回文串。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>s = "aacecaaa"
<strong>输出:</strong>"aaacecaaa"
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>s = "abcd"
<strong>输出:</strong>"dcbabcd"
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>0 <= s.length <= 5 * 10<sup>4</sup></code></li>
<li><code>s</code> 仅由小写英文字母组成</li>
</ul>