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Leetcode Validate Binary Search Tree
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.
- Both the left and right subtrees must also be binary search trees.
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/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: bool check(TreeNode *node,int lv,int rv){ if(node==NULL) return true; return lv<node->val&&node->val<rv&&check(node->left,lv,node->val)&&check(node->right,node->val,rv); } bool isValidBST(TreeNode *root) { return check(root,INT_MIN,INT_MAX); } };
Leetcode Validate Binary Search Tree
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