n-ary-tree-postorder-traversal

N-ary Tree Postorder Traversal

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postorder

Given the <code>root</code> of an n-ary tree, return the postorder traversal of its nodes&#39; values.

Nary-Tree input serialization is represented in their level order traversal. Each group of children is separated by the null value (See examples)

&nbsp;
Example 1:
<img src="https://assets.leetcode.com/uploads/2018/10/12/narytreeexample.png" style="width: 100%; max-width: 300px;" />
<pre>
Input: root = [1,null,3,2,4,null,5,6]
Output: [5,6,3,2,4,1]
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2019/11/08/sample_4_964.png" style="width: 296px; height: 241px;" />
<pre>
Input: 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]
Output: [2,6,14,11,7,3,12,8,4,13,9,10,5,1]
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the tree is in the range <code>[0, 104]</code>.</li>
	<li><code>0 &lt;= Node.val &lt;= 104</code></li>
	<li>The height of the n-ary tree is less than or equal to <code>1000</code>.</li>
</ul>

&nbsp;
Follow up: Recursive solution is trivial, could you do it iteratively?

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