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+<h2>5. Longest Palindromic Substring</h2><h3>Medium</h3><hr><div><p>Given a string <code>s</code>, return&nbsp;<em>the longest palindromic substring</em> in <code>s</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> s = "babad"
+<strong>Output:</strong> "bab"
+<strong>Note:</strong> "aba" is also a valid answer.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> s = "cbbd"
+<strong>Output:</strong> "bb"
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> s = "a"
+<strong>Output:</strong> "a"
+</pre>
+
+<p><strong>Example 4:</strong></p>
+
+<pre><strong>Input:</strong> s = "ac"
+<strong>Output:</strong> "a"
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= s.length &lt;= 1000</code></li>
+	<li><code>s</code> consist of only digits and English letters (lower-case and/or upper-case),</li>
+</ul>
+</div>