Given a binary tree, return the postorder traversal 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? 经典题目,求二叉树的后序遍历的非递归方法,跟前序,中序,层序一样都需要用到栈,后续的
Given a binary tree, return the preorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Note: Recursive solution is trivial, could you do it iteratively? 一般我们提到树的遍历,最常见的有先序遍历,中序遍历,后序遍历和层序遍历,它们用递归实现起
Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 这道题要求从中序和后序遍历的结果来重建原二叉树,我们知道中序的遍历顺序是左-根-右,后序的顺序是左-右-根,对于这种树的重建一般都是采用递归来做,可参见我之前的一篇博客Convert Sorted Array to Bin
Given preorder and inorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree. 这道题要求用先序和中序遍历来建立二叉树,跟之前那道Construct Binary Tree from Inorder and Postorder Traversal 由中序和后序遍历建立二叉树原理基本相同,针对这道题,由于先
Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,3,2]. Note: Recursive solution is trivial, could you do it iteratively? confused what "{1,#,2,3}" means? > re
找了下先序遍历二叉树C# 实现貌似没有 顺手些了一个 大致思路是: 传入根节点,然后依次循环其子节点推入到栈中, 当推入的节点没有子节点的时候(叶子)或者所有子节点均已经遍历过后(上一次遍历的节点是该节点的右子节点),再依次退出栈. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Console
题目: 思路: 这题是比较典型的树的遍历问题,思路就是将中序遍历作为位置的判断依据,假设有个节点A和它的父亲Afa,那么如果A和Afa的顺序在中序遍历中是先A后Afa,则A是Afa的左儿子,否则是右儿子. 用for遍历一遍所有的节点,让每一个节点都连接到它的父亲,最后从根节点开始访问即可. 代码: // // main.cpp // Tree // // Created by wasdns on 16/12/19. // Copyright ? 2016年 wasdns. All rights