Quick Overview

Compute how much rainwater is trapped between nonnegative elevation bars in linear time. Explain both prefix-boundary arrays and the constant-space two-pointer proof, including empty inputs, equal boundaries, and large arrays.

Measure Water Trapped Between Elevations

Company: Hive.Ai

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: hard

Interview Round: Technical Screen

Overview: Compute how much rainwater is trapped between nonnegative elevation bars in linear time. Explain both prefix-boundary arrays and the constant-space two-pointer proof, including empty inputs, equal boundaries, and large arrays.

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