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The Dictionary Inverter

A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
easy
Seniority
mid

Interview Prompt

The metadata service stores tag assignments as {item_id: category}, but downstream consumers need a reverse index that maps each category to all items tagged with it. Write a function that flips a dictionary so each original value becomes a key, mapping to a sorted list of original keys that shared that value.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision