Two Pointers
Two Pointers is a common algorithmic technique used to solve problems involving arrays, strings, or linked lists by using two pointers that traverse the data structure, often from different positions or directions. It is particularly effective for problems requiring searching, pairing, or comparing elements, such as finding pairs that sum to a target, removing duplicates, or checking for palindromes. The technique typically optimizes solutions from O(n²) to O(n) time complexity by reducing nested loops.
Developers should learn Two Pointers when working on problems that involve sorted or unsorted sequences where efficient traversal and comparison are needed, such as in coding interviews, competitive programming, or performance-critical applications. It is especially useful for tasks like merging sorted arrays, finding subarrays with a given sum, or detecting cycles in linked lists, as it provides a simple yet powerful way to achieve linear time complexity with minimal extra space.