865. 包含所有最深节点的最小子树
Medium | Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
Hash Table
869. 重新排列得到2的幂
Medium | Hash Table, Math, Sorting, Counting, Enumeration
873. 最长斐波那契数列的长度
Medium | Array, Hash Table, Dynamic Programming
874. 模拟行走机器人
Medium | Array, Hash Table, Simulation
884. 两句话中的不常见单词
Easy | Hash Table, String, Counting
888. 公平的糖果棒交换
Easy | Array, Hash Table, Binary Search, Sorting
889. 根据前序和后序遍历构造二叉树
Medium | Array, Hash Table, Divide and Conquer, Tree, Binary Tree
890. 查找和替换模式
Medium | Array, Hash Table, String
895. 最大频率栈
Hard | Hash Table, Stack, Design, Ordered Set
911. 在线选举
Medium | Array, Hash Table, Binary Search, Design