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The Character Encoder

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
junior, mid

Interview Prompt

The compression team is benchmarking a simple encoding scheme on raw text and needs a quick prototype to test against their C++ implementation. Given a string, compress it so that consecutive runs of the same character are replaced by the character followed by the run length.

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