The Market Timer
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
A `prices` list holds one share price per trading day in chronological order. Return the largest gain from buying on one day and selling on a strictly later day, or 0 when no later day sells higher than an earlier one.
Summary
Buy low, sell later. The whole game is when.
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