Two Pointer

Engineering Articles & Deep Dives

Two Pointer Pattern and most asked problems like Two Sum II, 3Sum, Container With Most Water, and Valid Palindrome.

All Array / String Array + HashMap Sliding Window Two Pointer Linked List Binary Search Stack Matrix Trees DFS/BFS + BST Backtracking Heap and Priority Queue Graph + Topological Sort Dynamic Programming Prefix Sum Greedy Interval Divide and Conquer Union-Find (Disjoint Set Union) Trie Bit Manipulation Math / Number Theory
Two Pointer
Remove Duplicates from Sorted Array II [Medium]
21 Sep 2026 2 min read
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Two Pointer
Trapping Rain Water [Hard]
06 Sep 2026 4 min read
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