# 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.

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**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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## Python: Tips of the Day

**Free up Memory:**

- Manual garbage collection can be performed on timely or event based mechanism.

import gc collected_objects = gc.collect()

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