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Calculate how much rain water is trapped between nonnegative unit-width bars without mutating the input. A two-pointer scan tracks the highest boundary from each side, uses constant extra space, and handles totals beyond 32-bit range.

  • hard
  • Hive.Ai
  • Coding & Algorithms
  • Software Engineer

Calculate Trapped Rain Water

Company: Hive.Ai

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: hard

Interview Round: Technical Screen

Quick Answer: Calculate how much rain water is trapped between nonnegative unit-width bars without mutating the input. A two-pointer scan tracks the highest boundary from each side, uses constant extra space, and handles totals beyond 32-bit range.

Last updated: Jul 15, 2026
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