This question evaluates Python programming proficiency, algorithm design, data structure selection and justification, modular coding practices, unit testing, and time/space complexity analysis.

Design and implement a solution in Python for a problem specified by the interviewer. Outline your approach and chosen data structures, justify key design decisions and trade-offs, write clean modular code, provide unit tests and sample runs, and analyze the time and space complexity. You may use Google Colab for development and execution.