Calculate trapped water between elevation bars

Q: Calculate trapped water between elevation bars

This is a Coding & Algorithms interview question from Tesla for Software Engineer roles. View the full question and solution on PracHub.

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Question

Given an array of non-negative integers representing the heights of unit-width vertical bars, compute the total water retained after rainfall. Start by presenting a brute-force approach and analyze its time and space complexity. Then optimize to a linear-time solution that uses constant extra space, explain the intuition, and implement the final method.

Calculate trapped water between elevation bars

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