Trees and Binary Search Trees: Taxonomy, Invariant, and Traversal/Search

Company: Sig

Role: Software Engineer

Category: Software Engineering Fundamentals

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates a candidate's grasp of tree data structures and the binary search tree ordering invariant, along with the ability to implement traversal and search operations. It is a common software engineering fundamentals topic used to check whether someone can precisely define an invariant, write correct code, and reason about time and space complexity relative to tree shape.