The Complement Hunt
An easy Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L4
Interview Prompt
A fraud monitor ingests a stream of transaction `amounts` in arrival order, watching for two that were split to reach a flagged `target`. As each amount arrives, report the position of an earlier amount that pairs with it to reach the target, or `-1` if no earlier amount does.
Summary
Every number is looking for its other half.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision