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            "categoryTitle": "Algorithms",
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            "title": "Flatten a Multilevel Doubly Linked List",
            "titleSlug": "flatten-a-multilevel-doubly-linked-list",
            "content": "<p>You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional <strong>child pointer</strong>. This child pointer may or may not point to a separate doubly linked list, also containing these special nodes. These child lists may have one or more children of their own, and so on, to produce a <strong>multilevel data structure</strong> as shown in the example below.</p>\n\n<p>Given the <code>head</code> of the first level of the list, <strong>flatten</strong> the list so that all the nodes appear in a single-level, doubly linked list. Let <code>curr</code> be a node with a child list. The nodes in the child list should appear <strong>after</strong> <code>curr</code> and <strong>before</strong> <code>curr.next</code> in the flattened list.</p>\n\n<p>Return <em>the </em><code>head</code><em> of the flattened list. The nodes in the list must have <strong>all</strong> of their child pointers set to </em><code>null</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten11.jpg\" style=\"width: 700px; height: 339px;\" />\n<pre>\n<strong>Input:</strong> head = [1,2,3,4,5,6,null,null,null,7,8,9,10,null,null,11,12]\n<strong>Output:</strong> [1,2,3,7,8,11,12,9,10,4,5,6]\n<strong>Explanation:</strong> The multilevel linked list in the input is shown.\nAfter flattening the multilevel linked list it becomes:\n<img src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten12.jpg\" style=\"width: 1000px; height: 69px;\" />\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten2.1jpg\" style=\"width: 200px; height: 200px;\" />\n<pre>\n<strong>Input:</strong> head = [1,2,null,3]\n<strong>Output:</strong> [1,3,2]\n<strong>Explanation:</strong> The multilevel linked list in the input is shown.\nAfter flattening the multilevel linked list it becomes:\n<img src=\"https://assets.leetcode.com/uploads/2021/11/24/list.jpg\" style=\"width: 300px; height: 87px;\" />\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> head = []\n<strong>Output:</strong> []\n<strong>Explanation:</strong> There could be empty list in the input.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of Nodes will not exceed <code>1000</code>.</li>\n\t<li><code>1 &lt;= Node.val &lt;= 10<sup>5</sup></code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>How the multilevel linked list is represented in test cases:</strong></p>\n\n<p>We use the multilevel linked list from <strong>Example 1</strong> above:</p>\n\n<pre>\n 1---2---3---4---5---6--NULL\n         |\n         7---8---9---10--NULL\n             |\n             11--12--NULL</pre>\n\n<p>The serialization of each level is as follows:</p>\n\n<pre>\n[1,2,3,4,5,6,null]\n[7,8,9,10,null]\n[11,12,null]\n</pre>\n\n<p>To serialize all levels together, we will add nulls in each level to signify no node connects to the upper node of the previous level. The serialization becomes:</p>\n\n<pre>\n[1,    2,    3, 4, 5, 6, null]\n             |\n[null, null, 7,    8, 9, 10, null]\n                   |\n[            null, 11, 12, null]\n</pre>\n\n<p>Merging the serialization of each level and removing trailing nulls we obtain:</p>\n\n<pre>\n[1,2,3,4,5,6,null,null,null,7,8,9,10,null,null,11,12]\n</pre>\n",
            "translatedTitle": "扁平化多级双向链表",
            "translatedContent": "<p>你会得到一个双链表，其中包含的节点有一个下一个指针、一个前一个指针和一个额外的 <strong>子指针</strong> 。这个子指针可能指向一个单独的双向链表，也包含这些特殊的节点。这些子列表可以有一个或多个自己的子列表，以此类推，以生成如下面的示例所示的 <strong>多层数据结构</strong> 。</p>\n\n<p>给定链表的头节点&nbsp;<font color=\"#c7254e\"><font face=\"Menlo, Monaco, Consolas, Courier New, monospace\"><span style=\"font-size:12.6px\"><span style=\"background-color:#f9f2f4\">head</span></span></font></font>&nbsp;，将链表 <strong>扁平化</strong> ，以便所有节点都出现在单层双链表中。让 <code>curr</code> 是一个带有子列表的节点。子列表中的节点应该出现在<strong>扁平化列表</strong>中的&nbsp;<code>curr</code> <strong>之后</strong> 和&nbsp;<code>curr.next</code>&nbsp;<strong>之前</strong> 。</p>\n\n<p>返回 <em>扁平列表的 <code>head</code>&nbsp;。列表中的节点必须将其 <strong>所有</strong> 子指针设置为&nbsp;<code>null</code>&nbsp;。</em></p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten11.jpg\" style=\"height:339px; width:700px\" /></p>\n\n<pre>\n<strong>输入：</strong>head = [1,2,3,4,5,6,null,null,null,7,8,9,10,null,null,11,12]\n<strong>输出：</strong>[1,2,3,7,8,11,12,9,10,4,5,6]\n<strong>解释：</strong>输入的多级列表如上图所示。\n扁平化后的链表如下图：\n<img src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten12.jpg\" style=\"height:69px; width:1000px\" />\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2021/11/09/flatten2.1jpg\" style=\"height:200px; width:200px\" /></p>\n\n<pre>\n<strong>输入：</strong>head = [1,2,null,3]\n<strong>输出：</strong>[1,3,2]\n<strong>解释：</strong>输入的多级列表如上图所示。\n扁平化后的链表如下图：\n<img src=\"https://assets.leetcode.com/uploads/2021/11/24/list.jpg\" style=\"height:87px; width:300px\" />\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>head = []\n<strong>输出：</strong>[]\n<strong>说明：</strong>输入中可能存在空列表。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>节点数目不超过 <code>1000</code></li>\n\t<li><code>1 &lt;= Node.val &lt;= 10<sup>5</sup></code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>如何表示测试用例中的多级链表？</strong></p>\n\n<p>以 <strong>示例 1</strong> 为例：</p>\n\n<pre>\n 1---2---3---4---5---6--NULL\n         |\n         7---8---9---10--NULL\n             |\n             11--12--NULL</pre>\n\n<p>序列化其中的每一级之后：</p>\n\n<pre>\n[1,2,3,4,5,6,null]\n[7,8,9,10,null]\n[11,12,null]\n</pre>\n\n<p>为了将每一级都序列化到一起，我们需要每一级中添加值为 null 的元素，以表示没有节点连接到上一级的上级节点。</p>\n\n<pre>\n[1,2,3,4,5,6,null]\n[null,null,7,8,9,10,null]\n[null,11,12,null]\n</pre>\n\n<p>合并所有序列化结果，并去除末尾的 null 。</p>\n\n<pre>\n[1,2,3,4,5,6,null,null,null,7,8,9,10,null,null,11,12]\n</pre>\n\n<ul>\n</ul>\n",
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