Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants. Example: Input: [10,5,15,1,8,null,7] 10 / \ 15 / \…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 15 / \ \ 1 8 7 The Largest…

原题链接在这里:https://leetcode.com/problems/largest-bst-subtree/ 题目: Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its d…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 5 15 / \ \ 1 8 7 The Large…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 DFS 日期 题目地址:https://leetcode-cn.com/problems/largest-bst-subtree/ 题目描述 Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means sub…

［抄题］: Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants. Example: Input: [10,5,15,1,8,null,7] 10 / \ 1…

nlgn就不说了..说n的方法. 这个题做了好久. 一开始想到的是post-order traversal. 左右都是BST,然后自己也是BST,返还长度是左+右+自己(1). 左右其中一个不是,或者自己不是的话,返还-1. 第一次尝试忽略了跳级问题,判断自己能不能和左右子树组成BST的情况是,自己必须比左子树的最大值大,比右子树的最小值小..所以害的自己造个变量记录最大最小值. 提交的时候改了半天,主要问题在于更新最大最小但是会后,既要以子树更新,又要以自己的VAL更新,一开始忽略了其中一种.…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note: A subtree must include all of its descendants. Here's an example: 10 / \ 5 15 / \ \ 1 8 7 The Lar…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 5 15 / \ \ 1 8 7 The Large…

Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 5 15 / \ \ 1 8 7 The Large…