The Column Shuffle
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L6
Interview Prompt
Given records (list of dicts with 'id' and 'amount'), group by id preserving input order. For each group, produce a dict with 'id' plus keys 'amount_1', 'amount_2', ..., 'amount_k' for that group's amounts in order. Return the list of per-id dicts in the order each id first appears.
Summary
Rows in, columns out. Number them.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision