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            "categoryTitle": "Algorithms",
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            "title": "N-ary Tree Preorder Traversal",
            "titleSlug": "n-ary-tree-preorder-traversal",
            "content": "<p>Given the <code>root</code> of an n-ary tree, return <em>the preorder traversal of its nodes&#39; values</em>.</p>\n\n<p>Nary-Tree input serialization is represented in their level order traversal. Each group of children is separated by the null value (See examples)</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2018/10/12/narytreeexample.png\" style=\"width: 100%; max-width: 300px;\" /></p>\n\n<pre>\n<strong>Input:</strong> root = [1,null,3,2,4,null,5,6]\n<strong>Output:</strong> [1,3,5,6,2,4]\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/08/sample_4_964.png\" style=\"width: 296px; height: 241px;\" /></p>\n\n<pre>\n<strong>Input:</strong> root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]\n<strong>Output:</strong> [1,2,3,6,7,11,14,4,8,12,5,9,13,10]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[0, 10<sup>4</sup>]</code>.</li>\n\t<li><code>0 &lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li>The height of the n-ary tree is less than or equal to <code>1000</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Follow up:</strong> Recursive solution is trivial, could you do it iteratively?</p>\n",
            "translatedTitle": "N 叉树的前序遍历",
            "translatedContent": "<p>给定一个 n&nbsp;叉树的根节点 <meta charset=\"UTF-8\" />&nbsp;<code>root</code>&nbsp;，返回 <em>其节点值的<strong> 前序遍历</strong></em> 。</p>\n\n<p>n 叉树 在输入中按层序遍历进行序列化表示，每组子节点由空值 <code>null</code> 分隔（请参见示例）。</p>\n\n<p><br />\n<strong>示例 1：</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2018/10/12/narytreeexample.png\" style=\"height: 193px; width: 300px;\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [1,null,3,2,4,null,5,6]\n<strong>输出：</strong>[1,3,5,6,2,4]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/08/sample_4_964.png\" style=\"height: 272px; width: 300px;\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]\n<strong>输出：</strong>[1,2,3,6,7,11,14,4,8,12,5,9,13,10]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>节点总数在范围<meta charset=\"UTF-8\" />&nbsp;<code>[0, 10<sup>4</sup>]</code>内</li>\n\t<li><code>0 &lt;= Node.val &lt;= 10<sup>4</sup></code></li>\n\t<li>n 叉树的高度小于或等于 <code>1000</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>进阶：</strong>递归法很简单，你可以使用迭代法完成此题吗?</p>\n",
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