Depth-first Search – (Preorder, Inorder, and Postorder)

This lecture provides a theoretical overview of tree traversal methods: preorder, inorder, and postorder. It explains a trick to derive these traversals, emphasizing that this method is not suitable for coding or interviews but useful for theoretical understanding. The lecture details how to perform each traversal and concludes with a generalization of the methods.

What is the main purpose of the lecture discussed in the text?

Describe the process of preorder traversal as explained in the lecture.

What is the significance of visiting a node for the first time in preorder traversal?

How does the method for inorder traversal differ from preorder traversal?

Explain the concept of postorder traversal as described in the text.

What are the three types of tree traversal methods mentioned in the lecture?

How can the traversal methods be generalized based on their names?