Binary Tree Traversals Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2442    Accepted Submission(s): 1063 Problem Description A binary tree is a finite set of vertices that is either empty or…

传送门 Description A binary tree is a finite set of vertices that is either empty or consists of a root r and two disjoint binary trees called the left and right subtrees. There are three most important ways in which the vertices of a binary tree can be…

题目就是给出一棵二叉搜索树,已知根节点为0,并且给出一个序列要插入到这课二叉树中,求这棵二叉树层次遍历后的序列. 用结构体建立节点,val表示该节点存储的值,left指向左孩子,right指向右孩子.中序遍历的顺序正好是序列从小到大的顺序,因此中序遍历的时候顺便赋值就可以了,最后层次遍历输出. 思路一:中序遍历的时候赋值 #include <iostream> #include <cstdio> #include <algorithm> #include <str…

PAT甲级1119. Pre- and Post-order Traversals 题意: 假设二叉树中的所有键都是不同的正整数.一个唯一的二进制树可以通过给定的一对后序和顺序遍历序列来确定,也可以通过预序和顺序遍历序列来确定.然而,如果仅给出了后序和预序遍历序列,则相应的树可能不再是唯一的. 现在给出一对postorder和preorder遍历序列,你应该输出树的相应的顺序遍历序列.如果树不是唯一的,只需输出任何一个树. 输入规格: 每个输入文件包含一个测试用例.对于每种情况,第一行给出正整数…

No.1119 题目:由前序后序二叉树序列,推中序,判断是否唯一后输出一组中序序列 思路:前序从前向后找,后序从后向前找,观察正反样例可知,前后序树不唯一在于单一子树是否为左右子树. 判断特征:通过查找后序序列中最后一个结点的前一个在先序中的位置,来确定是否可以划分左右孩子,如果不能,  就将其划分为右孩子(或左孩子),递归建树. 中序遍历输出. #include <iostream> using namespace std; const int maxn = 31; int n, index…

1020 Tree Traversals (25)(25 分) Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to output the level order traversal sequence of the corresponding binary…

1119. Pre- and Post-order Traversals (30) Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences, or preorder and inorder traversa…

Given inorder and level-order traversals of a Binary Tree, construct the Binary Tree. Following is an example to illustrate the problem. BinaryTree Input: Two arrays that represent Inorder and level order traversals of a Binary Treein[]    = {4, 8, 1…

PAT甲级:1064 Complete Binary Search Tree (30分) 题干 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than the node's key. The right subtre…

1119 Pre- and Post-order Traversals (30 分) Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences, or preorder and inorder travers…