Python: Binary Search Tree (BST)- Exercises, Practice, Solution

Binary Search Tree: [ 6 exercises with solution]

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1. Write a Python program to create a Balanced Binary Search Tree (BST) using an array of elements where array elements are sorted in ascending order.
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2. Write a Python program to find the closest value to a given target value in a given non-empty Binary Search Tree (BST) of unique values.
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3. Write a Python program to check whether a given binary tree is a valid binary search tree (BST) or not.

Let a binary search tree (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.

Example 1:
    2
   / \
  1   3
Binary tree [2,1,3], return true.
Example 2:
    1
   / \
  2   3
Binary tree [1,2,3], return false.

4. Write a Python program to delete a node with the given key in a given binary search tree (BST).
Note: Search for a node to remove. If the node is found, delete the node.
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5. Write a Python program to convert a given array of elements to a height balanced Binary Search Tree (BST).
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6. Write a Python program to find the k^th smallest element in a given binary search tree.
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