The Build Order
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
- L4
Interview Prompt
A build system has `n` modules numbered `0` to `n-1` and a list of `edges`, where each `[a, b]` pair means module `a` can only be built once module `b` has been built. Return an order in which every module can be built, and when more than one module is ready at the same moment, take the lowest-numbered one first. If the dependencies loop so that no valid order exists, return an empty list.
Summary
Some tasks must wait for others to finish 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