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Start with seen = set()

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

Interview Prompt

Start with seen = set(). Given visitors = ['a', 'b', 'a', 'c', 'b', 'd'], add each visitor to seen using a loop. Print the length of seen.

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

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