LeetCode Challenge Solutions A collection of programming problems, solved in JS Completed Solutions Arrays LC 1. Two Sum LC 49. Group Anagrams LC 128. Longest Consecutive Sequence LC 217. Contains Duplicate LC 238. Product of Array Except Self LC 242. Valid Anagram LC 271. Encode and Decode Strings LC 347. Top K Frequent Elements LC 1480. Running Sum of 1D Array Two Pointers Sliding Window Stack Binary Search Linked List Trees Tries Heap/Priority Queue Backtracking Graphs Advanced Graphs 1-D Dynamic Programming 2-D Dynamic Programming Greedy Intervals Math & Geometry Bit Manipulation