1998. 数组的 GCD 排序
Hard | Array, Math, Union-Find, Sorting, Number Theory
Union-Find
1020. 飞地的数量
Medium | Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix
1061. 字典序最小的等价字符串
Medium | String, Union-Find
1202. 交换字符串中的字符
Medium | Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union-Find, Sorting
1254. 封闭岛屿的数目
Medium | Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix
721. 账户合并
Medium | Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union-Find, Sorting
765. 情侣牵手
Hard | Greedy, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
778. 水位上升的泳池中游泳
Hard | Array, Binary Search, Depth-First Search, Breadth-First Search, Union-Find, Heap (Priority Queue), Matrix
803. 打砖块
Hard | Array, Union-Find, Matrix
924. 最小化恶意软件传播
Hard | Array, Hash Table, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory