460. LFU 缓存
Hard | Hash Table, Linked List, Design, Doubly-Linked List
Hash Table
1. 两数之和
Easy | Array, Hash Table
105. 从前序与中序遍历序列构造二叉树
Medium | Array, Hash Table, Divide and Conquer, Tree, Binary Tree
106. 从中序与后序遍历序列构造二叉树
Medium | Array, Hash Table, Divide and Conquer, Tree, Binary Tree
12. 整数转罗马数字
Medium | Hash Table, Math, String
128. 最长连续序列
Medium | Array, Hash Table, Union-Find
13. 罗马数字转整数
Easy | Hash Table, Math, String
133. 克隆图
Medium | Hash Table, Depth-First Search, Breadth-First Search, Graph Theory
138. 复制带随机指针的链表
Medium | Hash Table, Linked List
139. 单词拆分
Medium | Array, Hash Table, String, Dynamic Programming, Trie, Memoization