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leetcode-problemset/leetcode/problem/shortest-palindrome.html

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2022-03-27 18:35:17 +08:00
<p>You are given a string <code>s</code>. You can convert <code>s</code> to a palindrome by adding characters in front of it.</p>
<p>Return <em>the shortest palindrome you can find by performing this transformation</em>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre><strong>Input:</strong> s = "aacecaaa"
<strong>Output:</strong> "aaacecaaa"
</pre><p><strong>Example 2:</strong></p>
<pre><strong>Input:</strong> s = "abcd"
<strong>Output:</strong> "dcbabcd"
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>0 &lt;= s.length &lt;= 5 * 10<sup>4</sup></code></li>
<li><code>s</code> consists of lowercase English letters only.</li>
</ul>