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Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Onsite rounds at Palo Alto Networks.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Palo Alto Networks during technical interviews.

Mirror a binary tree and analyze complexity | Palo Alto Networks Interview Question

Mirror a binary tree and analyze complexity

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of binary tree manipulation and traversal methods, emphasizing recursion and iterative approaches as well as the ability to reason about time and space complexity.

Palo Alto Networks

Sep 6, 2025, 12:00 AM

Software Engineer

Onsite

Coding & Algorithms

Given the root of a binary tree, convert it to its mirror by swapping every node’s left and right children. Implement both recursive and iterative (using a stack or queue) solutions, analyze time and space complexity, and discuss edge cases (empty tree, single node, highly unbalanced). Perform a dry run on this tree (level order): [5,3,8,null,4,7,9].

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