Project Notes

Sort List

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Description

tab: English
 
<p>Given the <code>head</code> of a linked list, return <em>the list after sorting it in <strong>ascending order</strong></em>.</p>
 
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/14/sort_list_1.jpg" style="width: 450px; height: 194px;" />
<pre>
<strong>Input:</strong> head = [4,2,1,3]
<strong>Output:</strong> [1,2,3,4]
</pre>
 
<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/14/sort_list_2.jpg" style="width: 550px; height: 184px;" />
<pre>
<strong>Input:</strong> head = [-1,5,3,4,0]
<strong>Output:</strong> [-1,0,3,4,5]
</pre>
 
<p><strong class="example">Example 3:</strong></p>
 
<pre>
<strong>Input:</strong> head = []
<strong>Output:</strong> []
</pre>
 
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
 
<ul>
	<li>The number of nodes in the list is in the range <code>[0, 5 * 10<sup>4</sup>]</code>.</li>
	<li><code>-10<sup>5</sup> &lt;= Node.val &lt;= 10<sup>5</sup></code></li>
</ul>
 
<p>&nbsp;</p>
<p><strong>Follow up:</strong> Can you sort the linked list in <code>O(n logn)</code> time and <code>O(1)</code> memory (i.e. constant space)?</p>
 
 
 
---
 
[submissions](https://leetcode.com/problems/sort-list/submissions/) | [solutions](https://leetcode.com/problems/sort-list/solutions/)
 
 
tab: 中文
 
<p>给你链表的头结点&nbsp;<code>head</code>&nbsp;，请将其按 <strong>升序</strong> 排列并返回 <strong>排序后的链表</strong> 。</p>
 
<ul>
</ul>
 
<p>&nbsp;</p>
 
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/14/sort_list_1.jpg" style="width: 450px;" />
<pre>
<b>输入：</b>head = [4,2,1,3]
<b>输出：</b>[1,2,3,4]
</pre>
 
<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/14/sort_list_2.jpg" style="width: 550px;" />
<pre>
<b>输入：</b>head = [-1,5,3,4,0]
<b>输出：</b>[-1,0,3,4,5]
</pre>
 
<p><strong>示例 3：</strong></p>
 
<pre>
<b>输入：</b>head = []
<b>输出：</b>[]
</pre>
 
<p>&nbsp;</p>
 
<p><b>提示：</b></p>
 
<ul>
	<li>链表中节点的数目在范围&nbsp;<code>[0, 5 * 10<sup>4</sup>]</code>&nbsp;内</li>
	<li><code>-10<sup>5</sup>&nbsp;&lt;= Node.val &lt;= 10<sup>5</sup></code></li>
</ul>
 
<p>&nbsp;</p>
 
<p><b>进阶：</b>你可以在&nbsp;<code>O(n&nbsp;log&nbsp;n)</code> 时间复杂度和常数级空间复杂度下，对链表进行排序吗？</p>
 
 
 
---
 
[提交记录](https://leetcode.cn/problems/sort-list/submissions/) | [题解](https://leetcode.cn/problems/sort-list/solution/)

Solutions & Notes

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