Insert Delete GetRandom O(1)Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Remo
Design TwitterDesign a simplified version of Twitter where users can post tweets, follow/unfollow another user and is able to see the 10 most recent tweets in the user’s news feed. Your design should
Add and Search Word - Data structure designDesign a data structure that supports the following two operations: 12void addWord(word)bool search(word) search(word) can search a literal word or a regula
Implement Trie (Prefix Tree)Implement a trie with insert, search, and startsWith methods. Note: You may assume that all inputs are consist of lowercase letters a-z. 提示 解題應用 Trie Tree Defaul
Implement Queue using StacksImplement the following operations of a queue using stacks. push(x) – Push element x to the back of queue. pop() – Removes the element from in front of queue. peek() – Ge
Implement Stack using QueuesImplement the following operations of a stack using queues. push(x) – Push element x onto stack. pop() – Removes the element on top of the stack. top() – Get the top elem