Greedy

Easy | Math, Greedy

Hard | Array, Dynamic Programming, Greedy

Medium | String, Greedy

Hard | Array, Math, Greedy

Medium | Array, Hash Table, Greedy, Sorting, Heap (Priority Queue)

Medium | Array, Greedy, Sorting, Heap (Priority Queue)

Hard | Array, Math, Dynamic Programming, Greedy, Sorting

Medium | Divide and Conquer, Greedy, Tree, Depth-First Search, Binary Search Tree, Binary Tree

Hard | Array, Greedy, Sorting, Heap (Priority Queue)

Medium | Array, Hash Table, Greedy, Bit Manipulation