Union-Find

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

Hard | Array, Math, Divide and Conquer, Dynamic Programming, Tree, Union-Find, Binary Search Tree, Memoization, Combinatorics, Binary Tree

Medium | Array, Union-Find, Graph Theory, Minimum Spanning Tree

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

Hard | Array, Union-Find, Graph Theory, Topological Sort, Sorting, Matrix

Hard | Array, Two Pointers, Union-Find, Graph Theory, Sorting

Medium | Array, Depth-First Search, Union-Find

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

Hard | Array, Binary Search, Depth-First Search, Breadth-First Search, Union-Find, Matrix

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