Hard

Hard | String, Rolling Hash, String Matching, Hash Function

Hard | Array, Rolling Hash, String Matching, Hash Function

Hard | Array, Dynamic Programming, Sorting

Hard | Array, String, Trie, Rolling Hash, String Matching, Hash Function

Hard | Array, Binary Search, Greedy, Heap (Priority Queue)

Hard | Array, Dynamic Programming, Greedy, Bit Manipulation, Tree, Sorting

Hard | Array, Binary Indexed Tree, Segment Tree, Simulation

Hard | Array, Dynamic Programming, Prefix Sum

Hard | Array, Dynamic Programming

Hard | Array, Greedy, Sliding Window, Prefix Sum

Hard | Array, String, Trie

Hard | Array, Dynamic Programming, Sorting

Hard | Array, Math, Geometry, Sorting, Ordered Set

Hard | Array, Bit Manipulation, Union-Find, Graph Theory

Hard | Array, Binary Search, Stack, Monotonic Stack

Hard | Array, Math, Binary Search, Bit Manipulation, Combinatorics, Number Theory

Hard | Array, Binary Search, Dynamic Programming, Bit Manipulation, Segment Tree, Queue

Hard | Depth-First Search, Breadth-First Search, Graph Theory, Heap (Priority Queue), Shortest Path

Hard | Dynamic Programming, Prefix Sum

Hard | Array, Hash Table, Binary Search, Sliding Window