2026-08-01-mastering-the-two-pointers-pattern-a-complete-algorithmic-blueprint-0d0add75ac
Understanding the Two Pointers Pattern
DEV Community
EDITOR BRIEF
The Two Pointers pattern uses two indices to scan arrays or strings efficiently, often from opposite ends or at different speeds. It can replace nested loops and reduce runtime from O(N^2) to O(N), or to O(N log N) when sorting is needed. It can also help with in-place changes using O(1) extra space.
INSIGHTS
This pattern is useful when brute force feels too slow on arrays or strings. A good next step is to practice finding where two indices can move together or toward each other in simple coding problems.
COMMENTS
Loading comments…