mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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183 lines
31 KiB
JSON
183 lines
31 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "355",
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"questionFrontendId": "355",
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"boundTopicId": null,
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"title": "Design Twitter",
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"titleSlug": "design-twitter",
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"content": "<p>Design a simplified version of Twitter where users can post tweets, follow/unfollow another user, and is able to see the <code>10</code> most recent tweets in the user's news feed.</p>\n\n<p>Implement the <code>Twitter</code> class:</p>\n\n<ul>\n\t<li><code>Twitter()</code> Initializes your twitter object.</li>\n\t<li><code>void postTweet(int userId, int tweetId)</code> Composes a new tweet with ID <code>tweetId</code> by the user <code>userId</code>. Each call to this function will be made with a unique <code>tweetId</code>.</li>\n\t<li><code>List<Integer> getNewsFeed(int userId)</code> Retrieves the <code>10</code> most recent tweet IDs in the user's news feed. Each item in the news feed must be posted by users who the user followed or by the user themself. Tweets must be <strong>ordered from most recent to least recent</strong>.</li>\n\t<li><code>void follow(int followerId, int followeeId)</code> The user with ID <code>followerId</code> started following the user with ID <code>followeeId</code>.</li>\n\t<li><code>void unfollow(int followerId, int followeeId)</code> The user with ID <code>followerId</code> started unfollowing the user with ID <code>followeeId</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["Twitter", "postTweet", "getNewsFeed", "follow", "postTweet", "getNewsFeed", "unfollow", "getNewsFeed"]\n[[], [1, 5], [1], [1, 2], [2, 6], [1], [1, 2], [1]]\n<strong>Output</strong>\n[null, null, [5], null, null, [6, 5], null, [5]]\n\n<strong>Explanation</strong>\nTwitter twitter = new Twitter();\ntwitter.postTweet(1, 5); // User 1 posts a new tweet (id = 5).\ntwitter.getNewsFeed(1); // User 1's news feed should return a list with 1 tweet id -> [5]. return [5]\ntwitter.follow(1, 2); // User 1 follows user 2.\ntwitter.postTweet(2, 6); // User 2 posts a new tweet (id = 6).\ntwitter.getNewsFeed(1); // User 1's news feed should return a list with 2 tweet ids -> [6, 5]. Tweet id 6 should precede tweet id 5 because it is posted after tweet id 5.\ntwitter.unfollow(1, 2); // User 1 unfollows user 2.\ntwitter.getNewsFeed(1); // User 1's news feed should return a list with 1 tweet id -> [5], since user 1 is no longer following user 2.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= userId, followerId, followeeId <= 500</code></li>\n\t<li><code>0 <= tweetId <= 10<sup>4</sup></code></li>\n\t<li>All the tweets have <strong>unique</strong> IDs.</li>\n\t<li>At most <code>3 * 10<sup>4</sup></code> calls will be made to <code>postTweet</code>, <code>getNewsFeed</code>, <code>follow</code>, and <code>unfollow</code>.</li>\n</ul>\n",
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"translatedTitle": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 3605,
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"dislikes": 461,
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"isLiked": null,
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"similarQuestions": "[{\"title\": \"Design a File Sharing System\", \"titleSlug\": \"design-a-file-sharing-system\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
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"exampleTestcases": "[\"Twitter\",\"postTweet\",\"getNewsFeed\",\"follow\",\"postTweet\",\"getNewsFeed\",\"unfollow\",\"getNewsFeed\"]\n[[],[1,5],[1],[1,2],[2,6],[1],[1,2],[1]]",
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"categoryTitle": "Algorithms",
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"contributors": [],
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"topicTags": [
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{
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"name": "Hash Table",
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"slug": "hash-table",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Linked List",
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"slug": "linked-list",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Design",
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},
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{
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"name": "Heap (Priority Queue)",
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"slug": "heap-priority-queue",
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"translatedName": null,
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}
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"codeSnippets": [
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{
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Twitter {\npublic:\n Twitter() {\n \n }\n \n void postTweet(int userId, int tweetId) {\n \n }\n \n vector<int> getNewsFeed(int userId) {\n \n }\n \n void follow(int followerId, int followeeId) {\n \n }\n \n void unfollow(int followerId, int followeeId) {\n \n }\n};\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter* obj = new Twitter();\n * obj->postTweet(userId,tweetId);\n * vector<int> param_2 = obj->getNewsFeed(userId);\n * obj->follow(followerId,followeeId);\n * obj->unfollow(followerId,followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "class Twitter {\n\n public Twitter() {\n \n }\n \n public void postTweet(int userId, int tweetId) {\n \n }\n \n public List<Integer> getNewsFeed(int userId) {\n \n }\n \n public void follow(int followerId, int followeeId) {\n \n }\n \n public void unfollow(int followerId, int followeeId) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter obj = new Twitter();\n * obj.postTweet(userId,tweetId);\n * List<Integer> param_2 = obj.getNewsFeed(userId);\n * obj.follow(followerId,followeeId);\n * obj.unfollow(followerId,followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python",
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"langSlug": "python",
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"code": "class Twitter(object):\n\n def __init__(self):\n \n\n def postTweet(self, userId, tweetId):\n \"\"\"\n :type userId: int\n :type tweetId: int\n :rtype: None\n \"\"\"\n \n\n def getNewsFeed(self, userId):\n \"\"\"\n :type userId: int\n :rtype: List[int]\n \"\"\"\n \n\n def follow(self, followerId, followeeId):\n \"\"\"\n :type followerId: int\n :type followeeId: int\n :rtype: None\n \"\"\"\n \n\n def unfollow(self, followerId, followeeId):\n \"\"\"\n :type followerId: int\n :type followeeId: int\n :rtype: None\n \"\"\"\n \n\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter()\n# obj.postTweet(userId,tweetId)\n# param_2 = obj.getNewsFeed(userId)\n# obj.follow(followerId,followeeId)\n# obj.unfollow(followerId,followeeId)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python3",
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"langSlug": "python3",
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"code": "class Twitter:\n\n def __init__(self):\n \n\n def postTweet(self, userId: int, tweetId: int) -> None:\n \n\n def getNewsFeed(self, userId: int) -> List[int]:\n \n\n def follow(self, followerId: int, followeeId: int) -> None:\n \n\n def unfollow(self, followerId: int, followeeId: int) -> None:\n \n\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter()\n# obj.postTweet(userId,tweetId)\n# param_2 = obj.getNewsFeed(userId)\n# obj.follow(followerId,followeeId)\n# obj.unfollow(followerId,followeeId)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C",
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"langSlug": "c",
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"code": "\n\n\ntypedef struct {\n \n} Twitter;\n\n\nTwitter* twitterCreate() {\n \n}\n\nvoid twitterPostTweet(Twitter* obj, int userId, int tweetId) {\n \n}\n\nint* twitterGetNewsFeed(Twitter* obj, int userId, int* retSize) {\n \n}\n\nvoid twitterFollow(Twitter* obj, int followerId, int followeeId) {\n \n}\n\nvoid twitterUnfollow(Twitter* obj, int followerId, int followeeId) {\n \n}\n\nvoid twitterFree(Twitter* obj) {\n \n}\n\n/**\n * Your Twitter struct will be instantiated and called as such:\n * Twitter* obj = twitterCreate();\n * twitterPostTweet(obj, userId, tweetId);\n \n * int* param_2 = twitterGetNewsFeed(obj, userId, retSize);\n \n * twitterFollow(obj, followerId, followeeId);\n \n * twitterUnfollow(obj, followerId, followeeId);\n \n * twitterFree(obj);\n*/",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Twitter {\n\n public Twitter() {\n \n }\n \n public void PostTweet(int userId, int tweetId) {\n \n }\n \n public IList<int> GetNewsFeed(int userId) {\n \n }\n \n public void Follow(int followerId, int followeeId) {\n \n }\n \n public void Unfollow(int followerId, int followeeId) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter obj = new Twitter();\n * obj.PostTweet(userId,tweetId);\n * IList<int> param_2 = obj.GetNewsFeed(userId);\n * obj.Follow(followerId,followeeId);\n * obj.Unfollow(followerId,followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "\nvar Twitter = function() {\n \n};\n\n/** \n * @param {number} userId \n * @param {number} tweetId\n * @return {void}\n */\nTwitter.prototype.postTweet = function(userId, tweetId) {\n \n};\n\n/** \n * @param {number} userId\n * @return {number[]}\n */\nTwitter.prototype.getNewsFeed = function(userId) {\n \n};\n\n/** \n * @param {number} followerId \n * @param {number} followeeId\n * @return {void}\n */\nTwitter.prototype.follow = function(followerId, followeeId) {\n \n};\n\n/** \n * @param {number} followerId \n * @param {number} followeeId\n * @return {void}\n */\nTwitter.prototype.unfollow = function(followerId, followeeId) {\n \n};\n\n/** \n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "class Twitter {\n constructor() {\n \n }\n\n postTweet(userId: number, tweetId: number): void {\n \n }\n\n getNewsFeed(userId: number): number[] {\n \n }\n\n follow(followerId: number, followeeId: number): void {\n \n }\n\n unfollow(followerId: number, followeeId: number): void {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Twitter {\n /**\n */\n function __construct() {\n \n }\n \n /**\n * @param Integer $userId\n * @param Integer $tweetId\n * @return NULL\n */\n function postTweet($userId, $tweetId) {\n \n }\n \n /**\n * @param Integer $userId\n * @return Integer[]\n */\n function getNewsFeed($userId) {\n \n }\n \n /**\n * @param Integer $followerId\n * @param Integer $followeeId\n * @return NULL\n */\n function follow($followerId, $followeeId) {\n \n }\n \n /**\n * @param Integer $followerId\n * @param Integer $followeeId\n * @return NULL\n */\n function unfollow($followerId, $followeeId) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * $obj = Twitter();\n * $obj->postTweet($userId, $tweetId);\n * $ret_2 = $obj->getNewsFeed($userId);\n * $obj->follow($followerId, $followeeId);\n * $obj->unfollow($followerId, $followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Swift",
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"langSlug": "swift",
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"code": "\nclass Twitter {\n\n init() {\n \n }\n \n func postTweet(_ userId: Int, _ tweetId: Int) {\n \n }\n \n func getNewsFeed(_ userId: Int) -> [Int] {\n \n }\n \n func follow(_ followerId: Int, _ followeeId: Int) {\n \n }\n \n func unfollow(_ followerId: Int, _ followeeId: Int) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * let obj = Twitter()\n * obj.postTweet(userId, tweetId)\n * let ret_2: [Int] = obj.getNewsFeed(userId)\n * obj.follow(followerId, followeeId)\n * obj.unfollow(followerId, followeeId)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Twitter() {\n\n fun postTweet(userId: Int, tweetId: Int) {\n \n }\n\n fun getNewsFeed(userId: Int): List<Int> {\n \n }\n\n fun follow(followerId: Int, followeeId: Int) {\n \n }\n\n fun unfollow(followerId: Int, followeeId: Int) {\n \n }\n\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class Twitter {\n\n Twitter() {\n \n }\n \n void postTweet(int userId, int tweetId) {\n \n }\n \n List<int> getNewsFeed(int userId) {\n \n }\n \n void follow(int followerId, int followeeId) {\n \n }\n \n void unfollow(int followerId, int followeeId) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter obj = Twitter();\n * obj.postTweet(userId,tweetId);\n * List<int> param2 = obj.getNewsFeed(userId);\n * obj.follow(followerId,followeeId);\n * obj.unfollow(followerId,followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Go",
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"langSlug": "golang",
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"code": "type Twitter struct {\n \n}\n\n\nfunc Constructor() Twitter {\n \n}\n\n\nfunc (this *Twitter) PostTweet(userId int, tweetId int) {\n \n}\n\n\nfunc (this *Twitter) GetNewsFeed(userId int) []int {\n \n}\n\n\nfunc (this *Twitter) Follow(followerId int, followeeId int) {\n \n}\n\n\nfunc (this *Twitter) Unfollow(followerId int, followeeId int) {\n \n}\n\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * obj := Constructor();\n * obj.PostTweet(userId,tweetId);\n * param_2 := obj.GetNewsFeed(userId);\n * obj.Follow(followerId,followeeId);\n * obj.Unfollow(followerId,followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class Twitter\n def initialize()\n \n end\n\n\n=begin\n :type user_id: Integer\n :type tweet_id: Integer\n :rtype: Void\n=end\n def post_tweet(user_id, tweet_id)\n \n end\n\n\n=begin\n :type user_id: Integer\n :rtype: Integer[]\n=end\n def get_news_feed(user_id)\n \n end\n\n\n=begin\n :type follower_id: Integer\n :type followee_id: Integer\n :rtype: Void\n=end\n def follow(follower_id, followee_id)\n \n end\n\n\n=begin\n :type follower_id: Integer\n :type followee_id: Integer\n :rtype: Void\n=end\n def unfollow(follower_id, followee_id)\n \n end\n\n\nend\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter.new()\n# obj.post_tweet(user_id, tweet_id)\n# param_2 = obj.get_news_feed(user_id)\n# obj.follow(follower_id, followee_id)\n# obj.unfollow(follower_id, followee_id)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Scala",
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"langSlug": "scala",
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"code": "class Twitter() {\n\n def postTweet(userId: Int, tweetId: Int) {\n \n }\n\n def getNewsFeed(userId: Int): List[Int] = {\n \n }\n\n def follow(followerId: Int, followeeId: Int) {\n \n }\n\n def unfollow(followerId: Int, followeeId: Int) {\n \n }\n\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "struct Twitter {\n\n}\n\n\n/** \n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Twitter {\n\n fn new() -> Self {\n \n }\n \n fn post_tweet(&self, user_id: i32, tweet_id: i32) {\n \n }\n \n fn get_news_feed(&self, user_id: i32) -> Vec<i32> {\n \n }\n \n fn follow(&self, follower_id: i32, followee_id: i32) {\n \n }\n \n fn unfollow(&self, follower_id: i32, followee_id: i32) {\n \n }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * let obj = Twitter::new();\n * obj.post_tweet(userId, tweetId);\n * let ret_2: Vec<i32> = obj.get_news_feed(userId);\n * obj.follow(followerId, followeeId);\n * obj.unfollow(followerId, followeeId);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define twitter%\n (class object%\n (super-new)\n \n (init-field)\n \n ; post-tweet : exact-integer? exact-integer? -> void?\n (define/public (post-tweet user-id tweet-id)\n )\n ; get-news-feed : exact-integer? -> (listof exact-integer?)\n (define/public (get-news-feed user-id)\n )\n ; follow : exact-integer? exact-integer? -> void?\n (define/public (follow follower-id followee-id)\n )\n ; unfollow : exact-integer? exact-integer? -> void?\n (define/public (unfollow follower-id followee-id)\n )))\n\n;; Your twitter% object will be instantiated and called as such:\n;; (define obj (new twitter%))\n;; (send obj post-tweet user-id tweet-id)\n;; (define param_2 (send obj get-news-feed user-id))\n;; (send obj follow follower-id followee-id)\n;; (send obj unfollow follower-id followee-id)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec twitter_init_() -> any().\ntwitter_init_() ->\n .\n\n-spec twitter_post_tweet(UserId :: integer(), TweetId :: integer()) -> any().\ntwitter_post_tweet(UserId, TweetId) ->\n .\n\n-spec twitter_get_news_feed(UserId :: integer()) -> [integer()].\ntwitter_get_news_feed(UserId) ->\n .\n\n-spec twitter_follow(FollowerId :: integer(), FolloweeId :: integer()) -> any().\ntwitter_follow(FollowerId, FolloweeId) ->\n .\n\n-spec twitter_unfollow(FollowerId :: integer(), FolloweeId :: integer()) -> any().\ntwitter_unfollow(FollowerId, FolloweeId) ->\n .\n\n\n%% Your functions will be called as such:\n%% twitter_init_(),\n%% twitter_post_tweet(UserId, TweetId),\n%% Param_2 = twitter_get_news_feed(UserId),\n%% twitter_follow(FollowerId, FolloweeId),\n%% twitter_unfollow(FollowerId, FolloweeId),\n\n%% twitter_init_ will be called before every test case, in which you can do some necessary initializations.",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule Twitter do\n @spec init_() :: any\n def init_() do\n \n end\n\n @spec post_tweet(user_id :: integer, tweet_id :: integer) :: any\n def post_tweet(user_id, tweet_id) do\n \n end\n\n @spec get_news_feed(user_id :: integer) :: [integer]\n def get_news_feed(user_id) do\n \n end\n\n @spec follow(follower_id :: integer, followee_id :: integer) :: any\n def follow(follower_id, followee_id) do\n \n end\n\n @spec unfollow(follower_id :: integer, followee_id :: integer) :: any\n def unfollow(follower_id, followee_id) do\n \n end\nend\n\n# Your functions will be called as such:\n# Twitter.init_()\n# Twitter.post_tweet(user_id, tweet_id)\n# param_2 = Twitter.get_news_feed(user_id)\n# Twitter.follow(follower_id, followee_id)\n# Twitter.unfollow(follower_id, followee_id)\n\n# Twitter.init_ will be called before every test case, in which you can do some necessary initializations.",
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"__typename": "CodeSnippetNode"
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}
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"Twitter\",\"postTweet\",\"getNewsFeed\",\"follow\",\"postTweet\",\"getNewsFeed\",\"unfollow\",\"getNewsFeed\"]\n[[],[1,5],[1],[1,2],[2,6],[1],[1,2],[1]]",
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