Both the left and right subtrees must also be binary search trees. 一开始是这样做的: 1classSolution {2public:3boolisValidBST(TreeNode*root) {4returncheckValid(root, INT_MIN, INT_MAX);5}67boolcheckValid(TreeNode * root,intleft,intright)8{9if(root ==NULL)10returntrue;11return(root->...
The right subtree of a node contains only nodes with keys greater than the node's key. Both the left and right subtrees must also be binary search trees. confused what "{1,#,2,3}" means? > read more on how binary tree is serialized on OJ. SOLUTION 1: 使用Iterator 中序遍历的方法,...
return dfs(root.Left, low, &root.Val) && dfs(root.Right, &root.Val, high) } 题目链接: Validate Binary Search Tree: leetcode.com/problems/v 带因子的二叉树: leetcode.cn/problems/va LeetCode 日更第 209 天,感谢阅读至此的你 欢迎点赞、收藏鼓励支持小满 ...
Leetcode 题目解法 98:Validate Binary Search Tree 题目要求去validate一个tree是不是Binary Search Tree,也就是所有left subtree的值都比现在node的值小,所有right subtree的值都比现在node的值大。 这个题目用dfs比较合适,如果用bfs会要按层展开,占用很大的空间,可能会stackoverflow。所以这里我们用深度优先搜索,先...
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的根结点的值; 若它的右子树不空,则右子树上所有...
* TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ // 由于 BST 的中序遍历是递增序列, 因此只需要中序列遍历,判断是否满足要求即可 class Solution { private: // 中序遍历 void inOrderScan(TreeNode* root, vector<int>& inOrderSequence) ...
题目:Vaildata Binary Search Tree(验证二叉搜索树) 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 keysless thanthe node's key. ...
My code: /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */publicclassSolution{longpre=(long)Integer.MIN_VALUE-1;publicbooleanisValidBST(TreeNoderoot){if(root==null){return...
* TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} * TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right (right) {} * }; */ class Solution { public: bool isValidBST(TreeNode* root) { } }; 已存储 行1,列 1 运行和提交代码需要登录 ...
#leetcode#98. Validate Binary Search Tree做了99题再看这道题就很简单了 û收藏 转发 评论 ñ赞 评论 o p 同时转发到我的微博 按热度 按时间 正在加载,请稍候...Ü 简介: 私人笔记 更多a 微关系 她的关注(109) 币安Binance官博 封面新闻 xiaolwl 微博会员 她...