How does In-Order traversal work in a Binary Tree?

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BlackTom AI · Accepted Answer

To start, we examine what In-Order traversal means in a binary tree: we visit the left subtree first, then the current node (the root), and finally the right subtree.
Option a: Root -> Right -> Left. This ordering visits the root first, then the right subtree, then the left subtree. That is characteristic of a preorder or a different traversal order, not In-Order.
Option b: Right -> Left -> Root. Here we visit the right subtree before the left subtree and then the root last. This resembles a postorder variant combined with an unusual left-right swap, and does not match In-Order.
Option c: Root -> Left -> Right. In this sequence we visit the root before either subtree, which aligns with preorder traversal, not In-Order.
Option d: Left -> Root -> Right. This exactly matches the In-Order pattern: traverse the left subtree, visit the root, then traverse the right subtree.
In summary, among the given choices, only the sequence in option d adheres to the canonical In-Order traversal order. The other options reflect alternative traversal orders or altered recursive schemes that do not describe In-Order.

FIT1008-FIT1054-FIT2085 Fundamentals of algorithms - S2 2025

How does In-Order traversal work in a Binary Tree?

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