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
Given a list of non-negative heights, return the total units of water trapped above the bars after rain. Use the two-pointer approach for O(n).
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