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
- L5
Interview Prompt
A terrain survey hands you an elevation profile as a list of non-negative `heights`, each bar one unit wide. After a storm, water pools in the dips between taller bars, while anything past the outer edges drains away. Return the total units of water the profile holds once the level settles.
Summary
What collects in the valleys after the rain?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision