Update Validate Binary Search Tree - Leetcode 98.py

Author: rai-abhi24

Validate Binary Search Tree - Leetcode 98.py

@@ -10,3 +10,6 @@ def is_valid(node, minn, maxx):
             return is_valid(node.left, minn, node.val) and is_valid(node.right, node.val, maxx)
 
         return is_valid(root, float("-inf"), float("inf"))
+
+# Time Complexity: O(n)
+# Space Complexity: O(h) { here "h" is height of tree }