Union-Find

Hard | Array, Math, Union-Find, Number Theory

Medium | Array, Binary Search, Breadth-First Search, Union-Find, Heap (Priority Queue), Matrix

Medium | Array, Union-Find, Sorting

Hard | Array, Dynamic Programming, Tree, Depth-First Search, Union-Find

Hard | Union-Find, Graph Theory

Hard | Array, Hash Table, String, Bit Manipulation, Union-Find

Medium | Depth-First Search, Breadth-First Search, Union-Find, Graph Theory

Hard | Array, Stack, Union-Find, Monotonic Stack

Medium | Array, Hash Table, Tree, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory

Hard | Array, Union-Find, Prefix Sum, Ordered Set