FromLeetcodeStatusACDateJul 10, 2023Tags栈树深度优先搜索二叉树Difficulty简单Linkhttps://leetcode.cn/problems/binary-tree-postorder-traversal/描述给你一棵二叉树的根节点 root ,返回其节点值的 后序遍历 。示例 1:``` 输入:root = [1,null,2,3] 输出:[3,2,1]输入:root = [] 输出:[]输入:root = [1] 输出:[1]思路代码