The Largest BST Subtree in this case is the highlighted one. The return value is the subtree's size, which is 3. Solution: 1/**2* Definition for a binary tree node.3* public class TreeNode {4* int val;5* TreeNode left;6* TreeNode right;7* TreeNode(int x) { val = x; }8*...
好,继续看 else 中的内容,如果破坏了 BST 的规则,则返回的三元组的最小值就是整型最小值,最大值是整型最大值,BST 结点个数并不是0,因为其左右子树中有可能还有 BST,所以是左右子树中的 BST 结点个数中的较大值,参见代码如下: 解法四: classSolution {public:intlargestBSTSubtree(TreeNode*root) { vector...
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,我们就统计节点的个数即可,参见代码如下: 解法二: classSolution {public:intlargestBSTSubtree(TreeNode*root) {if(!root)return0;if(isValid(root, INT_MIN, INT_MAX))returncount(root);returnmax(largestBSTSubtree(root->le...
Can you solve this real interview question? Maximum Sum BST in Binary Tree - Given a binary tree root, return the maximum sum of all keys of any sub-tree which is also a Binary Search Tree (BST). Assume a BST is defined as follows: * The left subtree
Leetcode: 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:...
You are given therootof a binary search tree (BST) and an integerval. Find the node in the BST that the node's value equalsvaland return the subtree rooted with that node. If such a node does not exist, returnnull. Example 1: ...
二叉搜索树（Binary Search Tree，简称 BST）20 / \ 10 30 / \ / \ 5 ...
秒了，但只想说：谢谢你！假装是中等题的简单题
查询index部分可以使用Map做查询,建议和下一道题 leetcode 106. Construct Binary Tree from Inorder and Postorder Traversal 中后序构造BST和leetcode 449. Serialize and Deserialize BST 二叉搜索树BST的序列化和反序列化一起学习。 建议和leetcode 87. Scramble String 字符串拼凑 && DFS深度优先搜索 和 leetco...
230 Kth Smallest Element in a BST 34.0% Medium 229 Majority Element II 24.2% Medium 228 Summary Ranges 21.6% Easy 227 Basic Calculator II 22.2% Medium Minimum Height Trees 【题目】For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then...