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40 lines
1.1 KiB
HTML
40 lines
1.1 KiB
HTML
<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>
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<pre>
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L<sub>0</sub> → L<sub>1</sub> → … → L<sub>n - 1</sub> → L<sub>n</sub>
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</pre>
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<p>请将其重新排列后变为：</p>
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<pre>
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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>
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<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>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<p><img alt="" src="https://pic.leetcode-cn.com/1626420311-PkUiGI-image.png" style="width: 240px; " /></p>
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<pre>
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<strong>输入：</strong>head = [1,2,3,4]
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<strong>输出：</strong>[1,4,2,3]</pre>
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<p><strong>示例 2：</strong></p>
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<p><img alt="" src="https://pic.leetcode-cn.com/1626420320-YUiulT-image.png" style="width: 320px; " /></p>
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<pre>
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<strong>输入：</strong>head = [1,2,3,4,5]
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<strong>输出：</strong>[1,5,2,4,3]</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li>链表的长度范围为 <code>[1, 5 * 10<sup>4</sup>]</code></li>
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<li><code>1 <= node.val <= 1000</code></li>
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</ul>
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