Data Structures and Algorithms The Complete Masterclass - Invert Binary Tree – Part 1

The video tutorial introduces binary trees, explaining their structure and the concept of nodes. It then delves into the problem of inverting a binary tree, using recursion to swap left and right nodes. The tutorial provides a step-by-step guide on implementing the inversion using Python, highlighting the importance of recursion and base cases. The video concludes with a demonstration of the code and its efficiency.

What is the primary goal of the lecture on binary trees?

• To explore the history of binary trees.

• To understand and solve the problem of inverting a binary tree.

• To learn how to construct a binary tree from scratch.

• To compare binary trees with other data structures.

In a binary tree, what is each element referred to as?

• Leaf

• Branch

• Node

• Root

What is a key similarity between binary trees and linked lists?

• Both are linear data structures.

• Both use nodes to store elements.

• Both are used for sorting data.

• Both have a single root element.

What is recursion primarily used for in binary trees?

• To construct new trees from existing ones.

• To divide the tree into subtrees for processing.

• To handle base cases in algorithms.

• To iterate over tree elements.

What is the base case in a recursive function for binary trees?

• When all nodes have two children.

• When the tree is completely inverted.

• When the root node is null or none.

• When the tree is fully balanced.

What is the main task in inverting a binary tree?

• Reversing the order of nodes in a list.

• Swapping the root node with its children.

• Balancing the tree by rearranging nodes.

• Swapping the left and right children of each node.

Which approach is NOT recommended for inverting a binary tree?

• Swapping nodes directly in the existing tree.

• Converting the tree to a list and back.

• Using recursion to swap nodes.

• Constructing a new tree from scratch.

In the code implementation, what is the first step in the inversion process?

• Adding a base case for recursion.

• Constructing a new binary tree.

• Converting the tree to a list.

• Swapping the left and right children of the root.

What should be done when the root node is null during recursion?

• Continue processing the tree.

• Swap the left and right children.

• Return the current root node.

• Stop the recursion and return null.

What is the final step in the binary tree inversion code?

• Return the inverted tree.

• Print the inverted tree.

• Store the inverted tree in a list.

• Delete the original tree.