2421. 好路径的数目
Hard | Array, Hash Table, Tree, Union-Find, Graph Theory, Sorting
Union-Find
2424. 最长上传前缀
Medium | Hash Table, Binary Search, Union-Find, Design, Binary Indexed Tree, Segment Tree, Heap (Priority Queue), Ordered Set
2492. 两座城市间路径的最小分数
Medium | Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
2493. 将节点分成最多的组数
Hard | Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
2503. 网格查询的最大得分
Hard | Array, Two Pointers, Breadth-First Search, Union-Find, Sorting, Heap (Priority Queue), Matrix
2573. 寻找具有LCP的字符串
Hard | Array, String, Dynamic Programming, Greedy, Union-Find, Matrix
2612. 最小反转操作数
Hard | Array, Hash Table, Breadth-First Search, Union-Find, Ordered Set
2617. 网格中到达目标的最少访问单元格数
Hard | Array, Dynamic Programming, Stack, Breadth-First Search, Union-Find, Heap (Priority Queue), Matrix, Monotonic Stack
1319. 连通网络的操作次数
Medium | Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
1361. 验证二叉树
Medium | Tree, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory, Binary Tree