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leetcode-problemset/leetcode-cn/problem (Chinese)/删除链表的倒数第 N 个结点 [remove-nth-node-from-end-of-list].html

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2022-03-27 20:56:26 +08:00
<p>给你一个链表,删除链表的倒数第&nbsp;<code>n</code><em>&nbsp;</em>个结点,并且返回链表的头结点。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/03/remove_ex1.jpg" style="width: 542px; height: 222px;" />
<pre>
<strong>输入:</strong>head = [1,2,3,4,5], n = 2
<strong>输出:</strong>[1,2,3,5]
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>head = [1], n = 1
<strong>输出:</strong>[]
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>head = [1,2], n = 1
<strong>输出:</strong>[1]
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li>链表中结点的数目为 <code>sz</code></li>
<li><code>1 &lt;= sz &lt;= 30</code></li>
<li><code>0 &lt;= Node.val &lt;= 100</code></li>
<li><code>1 &lt;= n &lt;= sz</code></li>
</ul>
<p>&nbsp;</p>
<p><strong>进阶:</strong>你能尝试使用一趟扫描实现吗?</p>