1086 Tree Traversals Again (25分)   An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations ar…

题意:输入一个正整数N(<=30),接着输入2*N行表示栈的出入(入栈顺序表示了二叉搜索树的先序序列,出栈顺序表示了二叉搜索树的中序序列),输出后序序列. AAAAAccepted code: #define HAVE_STRUCT_TIMESPEC #include<bits/stdc++.h> using namespace std; stack<int>st; ],b[]; ]; void build(int n,int*a,int*b,int*ans){ if(!n)…

题目地址 https://pta.patest.cn/pta/test/16/exam/4/question/667 5-5 Tree Traversals Again   (25分) An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys n…

7-5 Tree Traversals Again (25 分)   An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations ar…

03-树3. Tree Traversals Again (25) 题目来源:http://www.patest.cn/contests/mooc-ds/03-%E6%A0%913 An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys num…

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 tree. Input Specification: Each…

给出一个棵二叉树的后序遍历和中序遍历,求二叉树的层序遍历 #include<bits/stdc++.h> using namespace std; ; int in[N]; int post[N]; typedef struct node; typedef node *tree; struct node { int data; tree L; tree R; }; void print(tree &bt,int l1,int r1,int l2,int r2) { if(l1>r…

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 tree. Input Specification: Each…

题目如下: An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations are: push(1); push(2); push(3);…

题意:用栈的push.pop操作给出一棵二叉树的中序遍历顺序,求这棵二叉树的后序遍历. 需要一个堆结构s,一个child变量(表示该节点是其父亲节点的左孩子还是右孩子),父亲节点fa对于push v操作:1).第一个push肯定是根节点root.2).根据child变量,建立fa与v的父子关系.3).由于是中序遍历,所以接下来的节点必定是v的left(如果有的话),child=left,fa=v;4).然后进行push操作 对于pop操作:1).根据中序遍历性质,可知接下来的节点必定是pop节点…