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leetcode-cn/problem (English)/两两交换链表中的节点(English) [swap-nodes-in-pairs].html
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<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/03/swap_ex1.jpg" style="width: 422px; height: 222px;" />
<pre>
<strong>Input:</strong> head = [1,2,3,4]
<strong>Output:</strong> [2,1,4,3]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">head = [1,2,3,4]</span></p>
<p><strong>Output:</strong> <span class="example-io">[2,1,4,3]</span></p>
<p><strong>Explanation:</strong></p>
<p><img alt="" src="https://assets.leetcode.com/uploads/2020/10/03/swap_ex1.jpg" style="width: 422px; height: 222px;" /></p>
</div>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> head = []
<strong>Output:</strong> []
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">head = []</span></p>
<p><strong>Output:</strong> <span class="example-io">[]</span></p>
</div>
<p><strong class="example">Example 3:</strong></p>
<pre>
<strong>Input:</strong> head = [1]
<strong>Output:</strong> [1]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">head = [1]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1]</span></p>
</div>
<p><strong class="example">Example 4:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">head = [1,2,3]</span></p>
<p><strong>Output:</strong> <span class="example-io">[2,1,3]</span></p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>