leetcode-problemset/leetcode-cn/problem (Chinese)/删除排序链表中的重复元素 [remove-duplicates-from-sorted-list].html

<p>给定一个已排序的链表的头<meta charset="UTF-8" />&nbsp;<code>head</code>&nbsp;，&nbsp;<em>删除所有重复的元素，使每个元素只出现一次</em>&nbsp;。返回 <em>已排序的链表</em>&nbsp;。</p>

<p>&nbsp;</p>

<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/04/list1.jpg" style="height: 160px; width: 200px;" />
<pre>
<strong>输入：</strong>head = [1,1,2]
<strong>输出：</strong>[1,2]
</pre>

<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/04/list2.jpg" style="height: 123px; width: 300px;" />
<pre>
<strong>输入：</strong>head = [1,1,2,3,3]
<strong>输出：</strong>[1,2,3]
</pre>

<p>&nbsp;</p>

<p><strong>提示：</strong></p>

<ul>
	<li>链表中节点数目在范围 <code>[0, 300]</code> 内</li>
	<li><code>-100 &lt;= Node.val &lt;= 100</code></li>
	<li>题目数据保证链表已经按升序 <strong>排列</strong></li>
</ul>