classSolution {publicbooleanisValidBST(TreeNode root) {returnisValidBST(root, Integer.MIN_VALUE, Integer.MAX_VALUE); }publicbooleanisValidBST(TreeNode root,intminVal,intmaxVal) {if(root ==null) {returntrue; }if(
1 class Solution { 2 public: 3 bool isValidBST(TreeNode* root)//二叉树的中序遍历 4 { 5 //递归出口 6 if(!root) return true; 7 //搜索二叉树中根结点应小于左子树的最右边节点(左子树最大值),大于右子树的最左边节点(右子树最小值) 8 bool root_valid = false; 9 TreeNode* most_left_...
https://leetcode.com/problems/validate-binary-search-tree/ 二叉树的问题,要想到递归。这里容易想到的就是如果左右子树都存在,只要 if root.left.val < root.val < root.right.val: return self.isValidBST(root.left) and self.isValidBST(root.right) 1. 2. 但其实不对,看case [10,5,15,null,null...
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...
# Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution: def isValidBST(self, root: Optional[TreeNode]) -> bool: return Solution.dfs(root, None, Non...
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val <= searchMax(root.left).val) { // 根节点是否小于左子树中最大节点 return false; } if (root.right != null && root.val >= searchMin(root.right).val) { // 根节点是否大于右子树中最小节点 return false; } return isValidBST(root.left) && isValidBST(root.right); } private Tree...
valid_tic_tac_toe_state_794 docs: update readme Mar 28, 2020 validate_binary_search_tree_98 fix: imports to correct package Mar 28, 2020 verifying_an_alien_dictionary_953 docs: update readme Mar 28, 2020 word_break_139 docs: update readme ...
* 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){returntrue;}if(isValid...
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....