Two Pointers on a Sorted Array
Move ends inward to meet a target.
Why Two Pointers
The two-pointer technique scans an array with two indices instead of nested loops, turning many O(n^2) ideas into a single clean O(n) pass. 🎯
Sorted Is the Magic Word
The classic version needs a sorted array. Order lets you reason: moving right grows the value, moving left shrinks it, so each step is a real decision.
All lessons in this course
- Two Pointers on a Sorted Array
- Find a Pair with a Given Sum
- Remove Duplicates In Place
- Merge Two Sorted Sequences