midArrays
What is Two Pointer Technique in arrays?
Updated Apr 28, 2026
Short answer
Two pointers use two indices to traverse array efficiently.
Deep explanation
The two-pointer technique involves maintaining two indices (left and right) to solve problems like searching pairs, reversing arrays, or removing duplicates efficiently in O(n).
Real-world example
Checking if a sorted array has two numbers summing to target.
Common mistakes
- Using on unsorted arrays incorrectly.
Follow-up questions
- When use two pointers?
- Why efficient?