mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
27 lines
1.0 KiB
HTML
27 lines
1.0 KiB
HTML
<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> </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> </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 <= Node.val <= 9</code></li>
|
|
</ul>
|
|
|
|
<p> </p>
|
|
<strong>Follow up:</strong> Could you do it in <code>O(n)</code> time and <code>O(1)</code> space? |