link:[https://leetcode.com/explore/learn/card/data-structure-tree/134/traverse-a-tree/928/] 递归解法: #Definition for a binary tree node.#class TreeNode(object):#def __init__(self, x):#self.val = x#self.left = None#
https://leetcode.com/problems/binary-tree-postorder-traversal/ Given a binary tree, return thepostordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / 3 return[3,2,1]. Note:Recursive solution is trivial, could you do it iteratively? 后续遍历二叉树,...
Go 语言递归实现 /** * Definition for a binary tree node. * type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */ func binaryTreePaths(root *TreeNode) []string { var res []string if root == nil { return res } dfs(root, "", &res) return res } fun...
where each node in this tree has exactlytwoorzerosub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nodes. More formally, the propertyroot.val = min(root.left.val, root.right.val)always holds. ...
Can you solve this real interview question? Lowest Common Ancestor of a Binary Tree - Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia [https://en.wikipedia.org/wi
LeetCode 106. Construct Binary Tree from Inorder and Postorder Traversal Description Given inorder and postorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree. For example, given inorder = [9,3,15,20,7]postorder = [9,15,7...
https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/ 这里是BT不是BST,思路就是找到root到p和q的path然后找到最后的一个交点。要注意如何find Path。 如何用递归 http://bookshadow.com/weblog/2015/07/13/leetcode-lowest-common-ancestor-binary-tree/ ...
LeetCode Top 100 Liked Questions 236. Lowest Common Ancestor of a Binary Tree (Java版; Medium) 题目描述 Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined betw...
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145. 二叉树的后序遍历 - 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] 解释: [https://assets.leetcode.com/uploads/2024/08/29/screenshot-2024-08-29-202743.png] 示例 2: 输入:root =