Arrays & Strings (Two Pointers)

Two Pointers is an efficient technique commonly used to solve problems involving arrays and strings. Instead of using nested loops, we use two pointers that move through the data based on certain conditions. This approach is useful for problems such as finding pairs, reversing arrays, checking palindromes, removing duplicates, and working with sorted arrays. Two Pointers can often reduce O(n²) solutions to O(n). In this section, you’ll learn different two-pointer patterns with clear examples and step-by-step explanations.