Problem · Array
Trapping Rain Water
● Hard
AmazonFULLTIMEONSITE INTERVIEW
See Amazon hiring insightsAmazonFULLTIMEONSITE INTERVIEWProblem statement
You are given an integer array height of length n. n vertical bars stand on the x-axis. The i-th bar has width 1 and height height[i].
Compute how many units of water the bars can trap after rain.
The problem statement continues
ProExamples
Example 1
height = [0,1,0,2,1,0,1,3,2,1,2,1]return = 6The bars trap 1 + 1 + 2 + 1 + 1 = 6 units of water.
FastPrep Pro
Reported in 1 Amazon interview this weekUnlock this recently reported problem
FastPrep Pro gives you full access to interview problems reported within the last week.
- Full problem statement and constraints
- 1 more worked example, explained
- Guided hints and editorial
- Run your code on real test cases
$8.25/month
$99 billed yearly — or $19 month-to-month. Cancel anytime.
Free plan — 2 of 2 free unlocks used this week