The Coin Vault
A medium 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
- medium
- Seniority
- L4
Interview Prompt
A cash register makes change from a fixed set of coin denominations, always reaching for the largest coin that still fits the amount it has left to give. Given a target `amount` and the available `coins`, return how many coins the register hands out following that largest-first rule.
Summary
Exact change only - and you want to use as few coins as possible.
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