1218. 给定差值的最长等差子序列
Medium | Array, Hash Table, Dynamic Programming
Hash Table
1248. 统计「优美子数组」
Medium | Array, Hash Table, Math, Sliding Window, Prefix Sum
1255. 由字母组成单词的最大得分
Hard | Array, Hash Table, String, Dynamic Programming, Backtracking, Bit Manipulation, Counting, Bitmask
1261. 在受污染的二叉树中查找元素
Medium | Hash Table, Tree, Depth-First Search, Breadth-First Search, Design, Binary Tree
1275. 找出井字棋的获胜者
Easy | Array, Hash Table, Matrix, Simulation
721. 账户合并
Medium | Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union-Find, Sorting
726. 原子的数量
Hard | Hash Table, String, Stack, Sorting
740. 删除并获得点数
Medium | Array, Hash Table, Dynamic Programming
748. 最短补全词
Easy | Array, Hash Table, String
752. 打开转盘锁
Medium | Array, Hash Table, String, Breadth-First Search