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The Expander

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, senior

Interview Prompt

Write a function that decodes a run-length encoded string. The input is a string where each run is represented as a count followed by a character, like '3a2b1c'. Return the fully decoded string.

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