Validate Binary Search Tree
Input level-order values → check if it's a valid BST
Number of nodes (N):
Level-order values (space separated):
10 5 20 3 7
🔍 Check BST
🔄 Reset
Result will appear here...
BST Property:
For every node:
• left subtree values < node value
• right subtree values > node value
Both subtrees must also be BSTs (checked recursively)