Matrix

Medium | Array, Hash Table, Matrix

Hard | Array, Hash Table, Matrix, Prefix Sum

Medium | Array, Breadth-First Search, Matrix

Hard | Array, Breadth-First Search, Matrix

Medium | Array, Backtracking, Matrix

Medium | Array, Matrix, Simulation

Medium | Array, Greedy, Matrix

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

Easy | Array, Matrix, Simulation

Easy | Array, Hash Table, Matrix, Simulation