Prefix Sum pattern
Overview
Precompute running totals · range sum in O(1). Watch it run step by step, then write your own pseudocode and get it checked by AI.
- Concept
- 1 approach
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Prefix Sum
Concept lesson
The approach
- 01 Concept O(n) build, O(1) queryO(n) space
What you will learn
- The idea behind Prefix Sum, drawn one step at a time
- Concept: O(n) build, O(1) query time, O(n) space
- The pseudocode for each approach, its line lit as the animation runs
More Prefix Sum
See Overview run, step by step
Sign in and this page opens on the animation, with all 2 Prefix Sum problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.