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+<h2><a href="https://leetcode.com/problems/palindrome-linked-list">234. Palindrome Linked List</a></h2><h3>Easy</h3><hr><p>Given the <code>head</code> of a singly linked list, return <code>true</code><em> if it is a </em><span data-keyword="palindrome-sequence"><em>palindrome</em></span><em> or </em><code>false</code><em> otherwise</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/03/pal1linked-list.jpg" style="width: 422px; height: 62px;" />
+<pre>
+<strong>Input:</strong> head = [1,2,2,1]
+<strong>Output:</strong> true
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/03/pal2linked-list.jpg" style="width: 182px; height: 62px;" />
+<pre>
+<strong>Input:</strong> head = [1,2]
+<strong>Output:</strong> false
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the list is in the range <code>[1, 10<sup>5</sup>]</code>.</li>
+	<li><code>0 &lt;= Node.val &lt;= 9</code></li>
+</ul>
+
+<p>&nbsp;</p>
+<strong>Follow up:</strong> Could you do it in <code>O(n)</code> time and <code>O(1)</code> space?