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Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
Given `n` non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Example
height = [0,1,0,2,1,0,1,3,2,1,2,1] → 6
Constraints
1 ≤ n ≤ 2 × 10⁴ · 0 ≤ height[i] ≤ 10⁵
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WPM—Fillers0Pace—Thinking0%
Explain the problem in your own words
0 words0 chars
AI Review
Write your thinking above first.
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The reviewer will check whether you stated inputs, output, guarantees, and any assumption you flagged.
Write at least a couple of sentences explaining the problem before submitting.