题目 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); po…

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…

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…

1020 Tree Traversals (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 tr…

题目 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: Ea…

入栈顺序为先序遍历,出栈顺序为中序遍历. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<stack> using namespace std; +; const int INF=0x7FFFFFFF; int n,tot; int Preorder[maxn],Inorder[maxn],Postorder[maxn]; int AP…

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);…

https://pintia.cn/problem-sets/994805342720868352/problems/994805380754817024 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…

题目 In computer science, a heap is a specialized tree-based data structure that satisfies the heap property: if P is a parent node of C, then the key (the value) of P is either greater than or equal to (in a max heap) or less than or equal to (in a mi…