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0143-reorder-list/README.md

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+<h2><a href="https://leetcode.com/problems/reorder-list/">143. Reorder List</a></h2><h3>Medium</h3><hr><div><p>You are given the head of a singly linked-list. The list can be represented as:</p>
+
+<pre>L<sub>0</sub> → L<sub>1</sub> → … → L<sub>n - 1</sub> → L<sub>n</sub>
+</pre>
+
+<p><em>Reorder the list to be on the following form:</em></p>
+
+<pre>L<sub>0</sub> → L<sub>n</sub> → L<sub>1</sub> → L<sub>n - 1</sub> → L<sub>2</sub> → L<sub>n - 2</sub> → …
+</pre>
+
+<p>You may not modify the values in the list's nodes. Only nodes themselves may be changed.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/04/reorder1linked-list.jpg" style="width: 422px; height: 222px;">
+<pre><strong>Input:</strong> head = [1,2,3,4]
+<strong>Output:</strong> [1,4,2,3]
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/09/reorder2-linked-list.jpg" style="width: 542px; height: 222px;">
+<pre><strong>Input:</strong> head = [1,2,3,4,5]
+<strong>Output:</strong> [1,5,2,4,3]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the list is in the range <code>[1, 5 * 10<sup>4</sup>]</code>.</li>
+	<li><code>1 &lt;= Node.val &lt;= 1000</code></li>
+</ul>
+</div>