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Diagonal Extract

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

Interview Prompt

We store correlation matrices as lists of lists and sometimes need just the diagonal for dimensionality checks. Extract the main diagonal (the values where the row index equals the column index) and return them as a flat list.

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