By utilizing two pointers either moving towards each other or in the same direction, we can reduce the time complexity of many problems from O (n2) to O (n) or O (nlog⁡n). HackerRank: Similar to LeetCode, HackerRank offers a variety of challenges that can help you hone your two-pointer skills. If the head pointer is , indicating the list is empty, nothing should be printed. Jan 7, 2024 · In essence, the Two Pointer technique aims to address problems where identifying pairs, subarrays, or specific patterns within arrays or linked lists is crucial. That is, change the next and prev pointers of the nodes so that the direction of the list is reversed. - Common problem patterns: Sliding-window (e. (Here, pointers are basically array indexes). Objective In this challenge, you will learn to implement the basic functionalities of pointers in C. Here is an example of a same direction two pointer question: Remove Duplicates. Level up your coding skills and quickly land a job.

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