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n-ary-tree-preorder-traversal/README.md

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+<h2>589. N-ary Tree Preorder Traversal</h2><h3>Easy</h3><hr><div><p>Given the <code>root</code> of an n-ary tree, return <em>the preorder traversal of its nodes' values</em>.</p>
+
+<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>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<p><img src="https://assets.leetcode.com/uploads/2018/10/12/narytreeexample.png" style="width: 100%; max-width: 300px;"></p>
+
+<pre><strong>Input:</strong> root = [1,null,3,2,4,null,5,6]
+<strong>Output:</strong> [1,3,5,6,2,4]
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<p><img alt="" src="https://assets.leetcode.com/uploads/2019/11/08/sample_4_964.png" style="width: 296px; height: 241px;"></p>
+
+<pre><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]
+<strong>Output:</strong> [1,2,3,6,7,11,14,4,8,12,5,9,13,10]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the tree is in the range <code>[0, 10<sup>4</sup>]</code>.</li>
+	<li><code>0 &lt;= Node.val &lt;= 10<sup>4</sup></code></li>
+	<li>The height of the n-ary tree is less than or equal to <code>1000</code>.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Follow up:</strong> Recursive solution is trivial, could you do it iteratively?</p>
+</div>