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The Trapped Pool

A hard Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
hard
Seniority
senior, staff

Interview Prompt

Write a function that takes a list of non-negative integers representing an elevation map where each value is the height of a bar of width 1. Compute how much water can be trapped between bars after it rains.

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