Loading interview...

The Coin Vault

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
mid, senior

Interview Prompt

A payment processing system needs to calculate the minimum number of bills or coins required to make exact change for a given amount. Given a target amount and a list of coin denominations sorted in any order, return the minimum number of coins needed to sum to the amount using a greedy strategy. Return -1 if exact change cannot be made.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision