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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