LeetCode 333. Largest BST Subtree 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
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 subtree with largest number of nodes in it.Note:A subtree must include all of its descendants....
refer to https://discuss.leetcode.com/topic/36995/share-my-o-n-java-code-with-brief-explanation-and-comments/2 这道题不好从root到leaf一层一层限制subtree取值范围,因为有可能parent并不能构成BST,反倒是需要如果subtree是BST的话,限制parent的取值范围,然后根据情况判断是: 1. 吸纳parent以及parent的另一...
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 descendants. Here's an exa...
333. Largest BST Subtree public class Solution { public int largestBSTSubtree(TreeNode root) { if(root == null) return 0; int[] res = recursive(root); return res[2]; } public int[] recursive(TreeNode root){ int[] res = new int[5];...
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这道题有两种解法。一种top down O(nlong(n)), 另外一种bottom up O(n)。 For bottom up approach, (重点是) in order for tree to be valid, root value needs to be greater than the max of left subtree, and the min of right subtree. ...
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333. Largest BST Subtree 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:...
下面我们来看一种更简洁的写法,对于每一个节点,都来验证其是否是 BST,如果是的话,就统计节点的个数即可,参见代码如下:解法二:class Solution { public: int largestBSTSubtree(TreeNode* root) { if (!root) return 0; if (isValid(root, INT_MIN, INT_MAX)...