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
- L4
Interview Prompt
Given an RLE-encoded string where each run is count followed by char (e.g. '3a2b1c'), return the decoded string. Counts are positive integers; characters are single letters.
Summary
What goes in small comes out big.
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