Validate Bst

easy
Question Solve Solutions 
1. You are given a partially written function to solve.
2. Determine if it is a valid binary search tree (BST).

3. A valid BST is defined as follows:
   3.1 The left subtree of a node contains only nodes with keys less than the node's key.
   3.2 The right subtree of a node contains only nodes with keys greater than the node's key.
   3.3 Both the left and right subtrees must also be binary search trees.

Input Format

Input is managed for you.

Output Format

output is managed for you.

Constraints

0 <= Number of Nodes <= 10^9
-10^9 <= value of Node data <= 10^9

Notice

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

Example

Input
13
7
3
2
-1
-1
5
-1
-1
10
-1
12
-1
-1
Output
true
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Recover Bst

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