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Rainwater Trapping Problem - solve with two-pointer technique

General/Othereasy0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
PayPal
Key Concepts Tested
python
Expert AnswerPremium
46 wordsInterview-ready
Water at i = min(left_max, right_max) - height[i]. Two pointers: maintain left_max, right_max; move from side with smaller max. Python: l,r=0,len(h)-1; lm=rm=w=0; while l<r: if h[l]<h[r]: lm=max(lm,h[l]); w+=lm-h[l]; l+=1; else: rm=max(rm,h[r]); w+=rm-h[r]; r-=1; return w. O(n) time, O(1) space....
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