The First Stranger
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
- L3
Interview Prompt
A short string of single-character status codes arrives in the order records were processed. Return the first code that appears exactly once, or an empty string if every code repeats.
Summary
In a crowd, the unique ones stand out first.
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