The Two Pointer Technique is a powerful algorithmic strategy used to solve problems involving arrays, strings, or linked lists efficiently. By using two pointers that traverse data structures in a coordinated manner, we can reduce time complexity from O(n²) to O(n) in many cases.
What is the Two Pointer Technique?
The technique involves using two pointers (indices or references) that traverse a data structure in a specific manner to solve a problem optimally.
The two pointers can move:
- Towards each other (one from start, one from end)
- In the same direction (both from start, but at different speeds)
- In alternating patterns (e.g., one moves while the other stays)