The Mirror Index
An easy Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L4
Interview Prompt
A search index `d` maps each document id to the single term it matched, and serving lookups needs the inverse. Return a new dict with each unique term pointing back to the documents that matched it.
Summary
Every value remembers who pointed to it.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision