Array

Medium | Array, Hash Table, Breadth-First Search

Hard | Array, Greedy, Segment Tree, Heap (Priority Queue)

Medium | Array, Dynamic Programming

Hard | Array, Greedy, Union-Find, Sorting

Easy | Array, Math

Medium | Array, Prefix Sum

Easy | Array, Simulation

Medium | Array, Bit Manipulation

Medium | Array

Medium | Array, Binary Search, Design, Prefix Sum