Loading interview...

Common Prefix

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

Domain
Python
Difficulty
hard

Interview Prompt

We need the shared path prefix across a set of S3 keys to identify the common directory root. Return the longest string that is a prefix of every string in the list. Return an empty string if there is no common prefix.

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