Tree Traversal Inorder Left Root Right in DSA Typescript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the order of nodes visited in an inorder tree traversal?

In inorder traversal, nodes are visited in the order: Left subtree, then Root node, then Right subtree.

beginner

Why is inorder traversal useful for binary search trees (BST)?

Inorder traversal of a BST visits nodes in ascending sorted order because it visits left (smaller), root, then right (larger) nodes.

beginner

Show the inorder traversal sequence for this tree:<br>Root: 2<br>Left child: 1<br>Right child: 3

The inorder traversal visits: 1 (left), 2 (root), 3 (right). So the sequence is 1 -> 2 -> 3.

intermediate

What is the base case in a recursive inorder traversal function?

The base case is when the current node is null (no node), then the function returns without doing anything.

intermediate

Describe the steps of a recursive inorder traversal function.

1. Traverse left subtree recursively.<br>2. Visit (process) the root node.<br>3. Traverse right subtree recursively.

In inorder traversal, which node is visited first?

A None

B Left child

C Right child

D Root node

In inorder traversal, the left subtree is visited first before the root and right subtree.

What is the inorder traversal output of a BST with nodes 5 (root), 3 (left), 7 (right)?

A 3 -> 7 -> 5

B 5 -> 3 -> 7

C 7 -> 5 -> 3

D 3 -> 5 -> 7

Inorder visits left, root, right so the order is 3, 5, 7.

Which traversal method visits nodes in ascending order for a BST?

A Preorder

B Postorder

C Inorder

D Level order

Inorder traversal visits BST nodes in ascending sorted order.

What happens when the recursive inorder function reaches a null node?

A It returns immediately

B It throws an error

C It processes the null node

D It continues to the right subtree

The base case returns immediately when the node is null to stop recursion.

Which of these is the correct order of operations in inorder traversal?

A Left, Root, Right

B Root, Left, Right

C Left, Right, Root

D Right, Root, Left

Inorder traversal visits left subtree first, then root, then right subtree.

Explain how inorder traversal works on a binary tree and why it is important for binary search trees.

Think about the order of visiting nodes and the property of BST.

Describe the recursive steps and base case for implementing inorder traversal.

Focus on the flow of recursion and stopping condition.