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"translatedContent": "<p>给你一个链表,每 <em>k </em>个节点一组进行翻转,请你返回翻转后的链表。</p>\n\n<p><em>k </em>是一个正整数,它的值小于或等于链表的长度。</p>\n\n<p>如果节点总数不是 <em>k </em>的整数倍,那么请将最后剩余的节点保持原有顺序。</p>\n\n<p><strong>进阶:</strong></p>\n\n<ul>\n\t<li>你可以设计一个只使用常数额外空间的算法来解决此问题吗?</li>\n\t<li><strong>你不能只是单纯的改变节点内部的值</strong>,而是需要实际进行节点交换。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/10/03/reverse_ex1.jpg\" style=\"width: 542px; height: 222px;\" />\n<pre>\n<strong>输入:</strong>head = [1,2,3,4,5], k = 2\n<strong>输出:</strong>[2,1,4,3,5]\n</pre>\n\n<p><strong>示例 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/10/03/reverse_ex2.jpg\" style=\"width: 542px; height: 222px;\" />\n<pre>\n<strong>输入:</strong>head = [1,2,3,4,5], k = 3\n<strong>输出:</strong>[3,2,1,4,5]\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong>head = [1,2,3,4,5], k = 1\n<strong>输出:</strong>[1,2,3,4,5]\n</pre>\n\n<p><strong>示例 4:</strong></p>\n\n<pre>\n<strong>输入:</strong>head = [1], k = 1\n<strong>输出:</strong>[1]\n</pre>\n\n<ul>\n</ul>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>列表中节点的数量在范围 <code>sz</code> 内</li>\n\t<li><code>1 <= sz <= 5000</code></li>\n\t<li><code>0 <= Node.val <= 1000</code></li>\n\t<li><code>1 <= k <= sz</code></li>\n</ul>\n",
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