What the Day Left Open
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
- junior
Interview Prompt
A brokerage's position-keeping service replays the day's executed `trades` to reconstruct each account's holdings. Each trade names a `ticker`, a `side` of `buy` or `sell`, and a share count, where buys add to a position and sells subtract from it. Return the net shares held per ticker.
Summary
Every fill moves a position. Reconstruct where the book settled by the close.
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