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. Example 1: 2 /\1 3 Binary tree[2,1,3], return true. Example 2: 1 /\2 3 Binary tree[1,2,3], return false. 2、边界条件...
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->...
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 ...
/* * @lc app=leetcode id=98 lang=javascript * * [98] Validate Binary Search Tree *//** * Definition for a binary tree node. * function TreeNode(val) { * this.val = val; * this.left = this.right = null; * } *//** * @param {TreeNode} root * @return {boolean} *...
Binary tree [1,2,3], return false. 题目大意: 判断给定二叉树是否是 BST(二叉搜索树)。 解题思路 方法一: 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。 方法二: 递归地判断相关子树是否在给定的区间内(左子树的元素都大于根节点的元素,...
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...
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数。所有左子树和右子树自身必须也是二叉搜索树。示例说明请见LeetCode官网。来源：力扣（LeetCode） 链接：https://leetcode-cn.com/problems/validate-binary-search-tree/ 著作权归领扣网络所有。商业转载请...
classSolution{publicbooleanisValidBST(TreeNode root){// 左子树,只要求不能比自己大,至于小到什么程度都无所谓,所以用int最小值作为左侧边界if(!isValidBST(root.left,Long.MIN_VALUE,root.val)){returnfalse;}// 右子树,只要求不能比自己小,至于达到什么程度都无所谓,所以用int最大值作为右侧边界if(!is...
Leetcode 98 Validate Binary Search Tree Leetcode 270 Cloest Binary Search Tree Value Leetcode 235 Lowest Common Ancestor of a Binary Search Tree Leetcode 669 Trim a Binary Search Tree (分治) Leetcode 700 Search in a Binary Search Tree Leetcode 108 Convert Sorted Array to Binary Search Tree...
Validate Binary Search Tree -https://leetcode.com/problems/validate-binary-search-tree/ Kth Smallest Element in a BST -https://leetcode.com/problems/kth-smallest-element-in-a-bst/ Lowest Common Ancestor of BST -https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/ ...