CS Foundations & Interview PrepBeginner6 modules~3.0 hours hands-on
Two-Pointer & Sliding Window Patterns
Master the two patterns that unlock ~30% of array and string interview problems by learning to recognize problem shapes, not memorize solutions.
// What you'll be able to do- Converge inward to solve pair problems in O(n)
- Slow/fast pointers for in-place array manipulation
- Maintain a window of size k with a running aggregate
- Expand and shrink to find optimal substrings
6 modules, built to run
Every module ships runnable code. Expand any one to see what's inside.
00IntroductionWhy patterns beat memorization30 min
Objective — Why patterns beat memorization
Start moduleFree preview
01Two Pointers — Opposite EndsConverge inward to solve pair problems in O(n)30 min
Objective — Converge inward to solve pair problems in O(n)
02Two Pointers — Same DirectionSlow/fast pointers for in-place array manipulation30 min
Objective — Slow/fast pointers for in-place array manipulation
03Fixed-Size Sliding WindowMaintain a window of size k with a running aggregate30 min
Objective — Maintain a window of size k with a running aggregate
04Variable-Size Sliding WindowExpand and shrink to find optimal substrings30 min
Objective — Expand and shrink to find optimal substrings
05Pattern SynthesisDecision framework for spotting the right technique in an interview30 min
Objective — Decision framework for spotting the right technique in an interview
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