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add leetcode problem-cn part6

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<p>给定一个单链表 <code>L</code><em> </em>的头节点 <code>head</code> ,单链表 <code>L</code> 表示为:</p>
<pre>
L<sub>0</sub> → L<sub>1</sub> → … → L<sub>n - 1</sub> → L<sub>n</sub>
</pre>
<p>请将其重新排列后变为:</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>不能只是单纯的改变节点内部的值,而是需要实际的进行节点交换。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<p><img alt="" src="https://pic.leetcode-cn.com/1626420311-PkUiGI-image.png" style="width: 240px; " /></p>
<pre>
<strong>输入:</strong>head = [1,2,3,4]
<strong>输出:</strong>[1,4,2,3]</pre>
<p><strong>示例 2</strong></p>
<p><img alt="" src="https://pic.leetcode-cn.com/1626420320-YUiulT-image.png" style="width: 320px; " /></p>
<pre>
<strong>输入:</strong>head = [1,2,3,4,5]
<strong>输出:</strong>[1,5,2,4,3]</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li>链表的长度范围为 <code>[1, 5 * 10<sup>4</sup>]</code></li>
<li><code>1 &lt;= node.val &lt;= 1000</code></li>
</ul>