Data Structures and Algorithms The Complete Masterclass - Invert Binary Tree – Part 2

This video tutorial explains the process of swapping subtrees in a binary tree using recursion. It covers the initial setup of the tree and code, the importance of swapping subtrees, and the recursive function calls involved. The tutorial also discusses handling base cases to prevent infinite loops and provides a detailed understanding of the code logic. The video concludes with advice on studying recursion and binary trees for better comprehension.

What is the initial input taken by the function in the tree inversion process?

• Subtree

• Root node

• Temporary variable

• Leaf node

What is the primary operation performed on the subtrees during the inversion process?

• Deleting

• Swapping

• Merging

• Copying

What is the role of temporary variables in the swapping process?

• To store the original tree

• To delete nodes

• To hold node values temporarily

• To merge nodes

What is the result of swapping the left and right subtrees of a node?

• The node is deleted

• The node becomes a leaf

• The subtrees are exchanged

• The node is duplicated

Why is it important to check if a node is null during the recursive calls?

• To avoid unnecessary swaps

• To prevent errors

• To ensure the node is a leaf

• To stop the recursion

What is returned after each recursive call in the tree inversion process?

• Leaf node

• Null

• Root node

• Temporary variable

Which node is considered the original root in the inversion process?

• Node 1

• Node 4

• Node 2

• Node 3

Why is it necessary to return a node in the recursive function?

• To ensure the function completes

• To maintain the tree structure

• To delete nodes

• To swap nodes

What is the purpose of the base case in the recursive function?

• To swap nodes

• To start the recursion

• To prevent infinite loops

• To merge subtrees

What happens if the base case is not included in a recursive function?

• The function will execute once

• The function will return null

• The function will not execute

• The function will enter an infinite loop