LeetCode 98: Valid Binary Search Tree
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/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class Solution { Integer min = null; public boolean isValidBST(TreeNode root) { if(root == null) { return true; } if (isValidBST(root.left) && (min == null || min < root.val)) { min = root.val; return isValidBST(root.right); } return false; } }
LeetCode 98: Valid Binary Search Tree
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LeetCode 98: Valid Binary Search Tree
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