If your interview is in a Lisp, there is exactly one correct IDE you may use. Never use this IDE if your interview is not a Lisp.
If the hint is "What's the simplest means of representing this structure," kindly thank the interviewer for their time and try your luck elsewhere. Finding the simplest means of representing anything is usually very time-consuming, and you only have an hour.
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Discussion on: The 3 Sins of Software Engineering Interviews
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