381. O(1) 时间插入、删除和获取随机元素 - 允许重复
Hard | Array, Hash Table, Math, Design, Randomized
Design
384. 打乱数组
Medium | Array, Math, Design, Randomized
432. 全 O(1) 的数据结构
Hard | Hash Table, Linked List, Design, Doubly-Linked List
449. 序列化和反序列化二叉搜索树
Medium | String, Tree, Depth-First Search, Breadth-First Search, Design, Binary Search Tree, Binary Tree
460. LFU 缓存
Hard | Hash Table, Linked List, Design, Doubly-Linked List
146. LRU 缓存
Medium | Hash Table, Linked List, Design, Doubly-Linked List
155. 最小栈
Medium | Stack, Design
173. 二叉搜索树迭代器
Medium | Stack, Tree, Design, Binary Search Tree, Binary Tree, Iterator
208. 实现 Trie（前缀树）
Medium | Hash Table, String, Design, Trie
211. 添加与搜索单词 - 数据结构设计
Medium | String, Depth-First Search, Design, Trie