This article walks through a step‑by‑step two‑pointer algorithm for LeetCode 80, showing how to delete duplicates in a sorted array in‑place so each element appears at most twice, with detailed code, pointer movement rules, and a generalization to K occurrences.
This article humorously references recent layoff memes before presenting a detailed tutorial on solving LeetCode problem 392—checking whether string s is a subsequence of t—using a two‑pointer algorithm, complete with step‑by‑step explanation, complexity analysis, visual illustrations, and reference implementations in C++, Java, and Python.
The article explains how to count the number of valid triangles that can be formed from an integer array by first sorting the array and then using a reverse‑order two‑pointer technique, detailing each step and providing a complete Go implementation.
This article introduces linked lists as a fundamental data structure, compares them with arrays, explains single, doubly, and circular variants, demonstrates insertion, deletion, and boundary handling with dummy nodes, and details two‑pointer techniques for cycle detection and finding the list’s midpoint.
This article presents a detailed walkthrough of the LeetCode "Container With Most Water" problem, covering the problem statement, a two‑pointer analysis, and a complete Java implementation, while highlighting key insights for efficiently maximizing water storage.
