[LeetCode] 98. Validate Binary Search Tree 验证二叉搜索树 验证二叉搜索树CategoryDifficultyLikesDislikes algorithms Medium (31.28%) 620 - TagsCompanies给定一个二叉树,判断其是否是一个有效的二叉搜索树。假设一个二叉搜索树具有如下特征:节点的左子树只包含小于当前节点的数。 节点的右子树只包含大于当前节点的...
答案代码: 1publicbooleanisValidBST(TreeNode root) {2returnisValidBST(root, Long.MIN_VALUE, Long.MAX_VALUE);3}45publicbooleanisValidBST(TreeNode root,longminVal,longmaxVal) {6if(root ==null)returntrue;7if(root.val >= maxVal || root.val <= minVal)returnfalse;8returnisValidBST(root.left...
Both the left and right subtrees must also be binary search trees. Example 1: 2 / \ 1 3 1. 2. 3. Binary tree [2,1,3], return true. Example 2: 1 / \ 2 3 1. 2. 3. Binary tree [1,2,3], return false. ...
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node’s key. The right subtree of a node contains only nodes with keys greater than the node’s key...
public boolean isValidBST(TreeNode root) { if (root == null) { return true; } boolean leftVailid = true; boolean rightVaild = true; if (root.left != null) { //大于左孩子并且左子树是合法二分查找树 leftVailid = root.val > root.left.val && isValidBST(root.left); } if (!left...
Leetcode 98. Validate Binary Search Tree Given a binary tree, determine if it is a valid binary se... ShutLove阅读 253评论 0赞 0 [leetcode] 98. Validate Binary Search Tree Given a binary tree, determine if it is a valid binary se... 叶孤陈阅读 399评论 0赞 0 LeetCode 98 Validate...
本题链接:Validate Binary Search Tree 本题标签:Tree,DFS 本题难度: 英文题目 中文题目 方案1: class Solution{private:boolcheckValid(TreeNode*node,longlonglow_bound,longlongupp_bound){if(node==NULL)returntrue;if(node->val<=low_bound||node->val>=upp_bound)returnfalse;returncheckValid(node->left...
98. Validate Binary Search Tree #38 Open hayashi-ay wants to merge 4 commits into main from hayashi-ay-patch-27 +200 −0 Conversation 1 Commits 4 Checks 0 Files changed 1 ConversationOwner hayashi-ay commented Feb 29, 2024 https://leetcode.com/problems/validate-binary-search-tree/...
Leetcode-Medium 98. Validate Binary Search Tree Leetcode-Medium 98. Validate Binary Search Tree 题目描述 判定一棵树是否满足二叉搜索树的性质。二叉查找树(Binary Search Tree),(又:二叉搜索树,二叉排序树)它或者是一棵空树,或者是具有下列性质的二叉树: 若它的左子树不空,则左子树上所有结点的值均小于它...
The above binary tree is serialized as{2,1,4,#,#,3,5}(in level order). Note 第一种,先跑左子树的DFS:如果不满足,返回false. 左子树分支判断完成后,pre = root.left(因为唯一给pre赋值的语句是pre = root,所以运行完dfs(root.left)之后,pre = root.left)。