Note: For the coding companion problem, please see: Encode and Decode TinyURL. How would you design a URL shortening service that is similar to TinyURL? Background:TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com…

Note: This is a companion problem to the System Design problem: Design TinyURL. TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL such as http://tinyurl.com/4e9iA…

Note: For the coding companion problem, please see: Encode and Decode TinyURL. How would you design a URL shortening service that is similar to TinyURL? Background:TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com…

详见:https://leetcode.com/problems/encode-and-decode-tinyurl/description/ C++: class Solution { public: // Encodes a URL to a shortened URL. string encode(string longUrl) { url.push_back(longUrl); return "http://tinyurl.com/" + to_string(url.size(…

原题链接在这里:https://leetcode.com/problems/design-tinyurl/description/ 题目: How would you design a URL shortening service that is similar to TinyURL? Background:TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems…

Design a HashMap without using any built-in hash table libraries. To be specific, your design should include these functions: put(key, value) : Insert a (key, value) pair into the HashMap. If the value already exists in the HashMap, update the value.…

Design 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 support the following methods: postTweet(userId, tweetId): Compo…

Design a HashSet without using any built-in hash table libraries. To be specific, your design should include these functions: add(value): Insert a value into the HashSet. contains(value) : Return whether the value exists in the HashSet or not. remove…

Design a Tic-tac-toe game that is played between two players on a n x n grid. You may assume the following rules: A move is guaranteed to be valid and is placed on an empty block.Once a winning condition is reached, no more moves is allowed.A player…

LeetCode 622:设计循环队列 Design Circular Queue 首先来看看队列这种数据结构: 队列:先入先出的数据结构 在 FIFO 数据结构中,将首先处理添加到队列中的第一个元素. 如上图所示,队列是典型的 FIFO 数据结构.插入(insert)操作也称作入队(enqueue),新元素始终被添加在队列的末尾. 删除(delete)操作也被称为出队(dequeue). 你只能移除第一个元素. 队列 - 实现 为了实现队列,我们可以使用动态数组和指向队列头部的索引. 如上所述…