Binary Tree Restoring Time Limit: 1 Second      Memory Limit: 65536 KB      Special Judge Given two depth-first-search (DFS) sequences of a binary tree, can you find a binary tree which satisfies both of the DFS sequences? Recall that a binary tree i…

Binary Tree Restoring 思路: 递归 比较a序列和b序列中表示同一个子树的一段区间,不断递归 代码: #include<bits/stdc++.h> using namespace std; #define LL long long #define pb push_back #define mem(a,b) memset(a,b,sizeof(a)) ; int a[N],b[N],par[N],posa[N],posb[N],sum[N],n; void dfs(int…

地址:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3965 题目: iven two depth-first-search (DFS) sequences of a binary tree, can you find a binary tree which satisfies both of the DFS sequences? Recall that a binary tree is a tree in which…

Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1. Hide Tags Tree Depth-first Search  …

ZOJ3965 给定一颗二叉树的两种DFS序列 输出一种可能的二叉树的结构. 考察树的递归性质,不要想的太复杂. 当前节点在两个串中后面的节点假如不同则能确认两个子树,如果相同则把下个点作当前点的一个儿子.如果子树中还有未连根的点则接到当前点下.son数组表示每个点的子树有多少个点.pos数组记录每个数在每个序列中的位置.dfs中p1,p2指向同一个数 lim1,lim2表示当前点子树可能最大的子树范围. #include<iostream> #include<cstdio> #i…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Hide Tags Tree Depth-first Search     简单的深度搜索 #include <iostream> using namespace std; /*…

Leetcode之深度优先搜索(DFS)专题-199. 二叉树的右视图(Binary Tree Right Side View) 深度优先搜索的解题详细介绍,点击 给定一棵二叉树,想象自己站在它的右侧,按照从顶部到底部的顺序,返回从右侧所能看到的节点值. 示例: 输入: [1,2,3,null,5,null,4] 输出: [1, 3, 4] 解释: 1 <--- / \ 2 3 <--- \ \ 5 4 <--- 分析:把每一行的值保存起来,最后再把每一行最后一个放进ans里. AC代码…

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? Hide Tags Tree Stack   一题后续遍历树的问题,很基础,统计哪里的…

二叉树(Binary Tree)是最简单的树形数据结构,然而却十分精妙.其衍生出各种算法,以致于占据了数据结构的半壁江山.STL中大名顶顶的关联容器--集合(set).映射(map)便是使用二叉树实现.由于篇幅有限,此处仅作一般介绍(如果想要完全了解二叉树以及其衍生出的各种算法,恐怕要写8~10篇). 1)二叉树(Binary Tree) 顾名思义,就是一个节点分出两个节点,称其为左右子节点:每个子节点又可以分出两个子节点,这样递归分叉,其形状很像一颗倒着的树.二叉树限制了每个节点最多有两个子节…

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 between two nodes v and w as the lowest node in T that has both v and w…