D44 590. N-ary Tree Postorder Traversal
题目链接
590. N-ary Tree Postorder Traversal
题目分析
后序遍历,这题也是比较基础的题目了。
思路
先遍历子节点,再遍历根节点。
最终代码
<?php/*// Definition for a Node.class Node { public $val; public $children; @param Integer $val @param list<Node> $children function __construct($val, $children) { $this->val = $val; $this->children = $children; }}*/class Solution { public $val = []; /** * @param Node $root * @return Integer[] */ function postorder($root) { if(!$root){ return $this->val; } foreach($root->children as $child){ $this->postorder($child); } $this->val[] = $root->val; return $this->val; }}
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