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leetcode-problemset/leetcode-cn/problem (Chinese)/回文链表 [aMhZSa].html

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2022-03-27 20:38:29 +08:00
<p>给定一个链表的 <strong>头节点&nbsp;</strong><code>head</code><strong>&nbsp;</strong>请判断其是否为回文链表。</p>
<p>如果一个链表是回文,那么链表节点序列从前往后看和从后往前看是相同的。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<p><strong><img alt="" src="https://pic.leetcode-cn.com/1626421737-LjXceN-image.png" /></strong></p>
<pre>
<strong>输入:</strong> head = [1,2,3,3,2,1]
<strong>输出:</strong> true</pre>
<p><strong>示例 2</strong></p>
<p><strong><img alt="" src="https://pic.leetcode-cn.com/1626422231-wgvnWh-image.png" style="width: 138px; height: 62px;" /></strong></p>
<pre>
<strong>输入:</strong> head = [1,2]
<strong>输出:</strong> false
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li>链表 L 的长度范围为 <code>[1, 10<sup><span style="font-size: 9.449999809265137px;">5</span></sup>]</code></li>
<li><code>0&nbsp;&lt;= node.val &lt;= 9</code></li>
</ul>
<p>&nbsp;</p>
<p><strong>进阶:</strong>能否用&nbsp;O(n) 时间复杂度和 O(1) 空间复杂度解决此题?</p>
<p>&nbsp;</p>
<p><meta charset="UTF-8" />注意:本题与主站 234&nbsp;题相同:<a href="https://leetcode-cn.com/problems/palindrome-linked-list/">https://leetcode-cn.com/problems/palindrome-linked-list/</a></p>