Union-Find

Hard | Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union-Find

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

Medium | Array, Hash Table, Depth-First Search, Breadth-First Search, Union-Find, Matrix

Hard | Array, Math, Depth-First Search, Breadth-First Search, Union-Find, Geometry

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

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

Medium | Array, Hash Table, Binary Search, Union-Find, Graph Theory

Hard | Binary Search, Greedy, Union-Find, Graph Theory, Minimum Spanning Tree

Medium | Array, Hash Table, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory, Heap (Priority Queue), Ordered Set

Medium | Binary Search, Union-Find, Graph Theory, Sorting