{ "data": { "question": { "questionId": "2512", "questionFrontendId": "2424", "categoryTitle": "Algorithms", "boundTopicId": 1859568, "title": "Longest Uploaded Prefix", "titleSlug": "longest-uploaded-prefix", "content": "

You are given a stream of n videos, each represented by a distinct number from 1 to n that you need to "upload" to a server. You need to implement a data structure that calculates the length of the longest uploaded prefix at various points in the upload process.

\n\n

We consider i to be an uploaded prefix if all videos in the range 1 to i (inclusive) have been uploaded to the server. The longest uploaded prefix is the maximum value of i that satisfies this definition.
\n
\nImplement the LUPrefix class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["LUPrefix", "upload", "longest", "upload", "longest", "upload", "longest"]\n[[4], [3], [], [1], [], [2], []]\nOutput\n[null, null, 0, null, 1, null, 3]\n\nExplanation\nLUPrefix server = new LUPrefix(4);   // Initialize a stream of 4 videos.\nserver.upload(3);                    // Upload video 3.\nserver.longest();                    // Since video 1 has not been uploaded yet, there is no prefix.\n                                     // So, we return 0.\nserver.upload(1);                    // Upload video 1.\nserver.longest();                    // The prefix [1] is the longest uploaded prefix, so we return 1.\nserver.upload(2);                    // Upload video 2.\nserver.longest();                    // The prefix [1,2,3] is the longest uploaded prefix, so we return 3.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "最长上传前缀", "translatedContent": "

给你一个 n 个视频的上传序列，每个视频编号为 1 到 n 之间的 不同 数字，你需要依次将这些视频上传到服务器。请你实现一个数据结构，在上传的过程中计算 最长上传前缀 。

\n\n

如果 闭区间 1 到 i 之间的视频全部都已经被上传到服务器，那么我们称 i 是上传前缀。最长上传前缀指的是符合定义的 i 中的 最大值 。
\n
\n请你实现 LUPrefix 类：

\n\n\n\n

 

\n\n

示例 1：

\n\n
输入：\n[\"LUPrefix\", \"upload\", \"longest\", \"upload\", \"longest\", \"upload\", \"longest\"]\n[[4], [3], [], [1], [], [2], []]\n输出：\n[null, null, 0, null, 1, null, 3]\n\n解释：\nLUPrefix server = new LUPrefix(4);   // 初始化 4个视频的上传流\nserver.upload(3);                    // 上传视频 3 。\nserver.longest();                    // 由于视频 1 还没有被上传，最长上传前缀是 0 。\nserver.upload(1);                    // 上传视频 1 。\nserver.longest();                    // 前缀 [1] 是最长上传前缀，所以我们返回 1 。\nserver.upload(2);                    // 上传视频 2 。\nserver.longest();                    // 前缀 [1,2,3] 是最长上传前缀，所以我们返回 3 。\n
\n\n

 

\n\n

提示：

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longest() {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * LUPrefix obj = new LUPrefix(n);\n * obj.upload(video);\n * int param_2 = obj.longest();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class LUPrefix(object):\n\n def __init__(self, n):\n \"\"\"\n :type n: int\n \"\"\"\n\n\n def upload(self, video):\n \"\"\"\n :type video: int\n :rtype: None\n \"\"\"\n\n\n def longest(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n\n# Your LUPrefix object will be instantiated and called as such:\n# obj = LUPrefix(n)\n# obj.upload(video)\n# param_2 = obj.longest()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class LUPrefix:\n\n def __init__(self, n: int):\n\n\n def upload(self, video: int) -> None:\n\n\n def longest(self) -> int:\n\n\n\n# Your LUPrefix object will be instantiated and called as such:\n# obj = LUPrefix(n)\n# obj.upload(video)\n# param_2 = obj.longest()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} LUPrefix;\n\n\nLUPrefix* lUPrefixCreate(int n) {\n\n}\n\nvoid lUPrefixUpload(LUPrefix* obj, int video) {\n\n}\n\nint lUPrefixLongest(LUPrefix* obj) {\n\n}\n\nvoid lUPrefixFree(LUPrefix* obj) {\n\n}\n\n/**\n * Your LUPrefix struct will be instantiated and called as such:\n * LUPrefix* obj = lUPrefixCreate(n);\n * lUPrefixUpload(obj, video);\n \n * int param_2 = lUPrefixLongest(obj);\n \n * lUPrefixFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class LUPrefix {\n\n public LUPrefix(int n) {\n\n }\n \n public void Upload(int video) {\n\n }\n \n public int Longest() {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * LUPrefix obj = new LUPrefix(n);\n * obj.Upload(video);\n * int param_2 = obj.Longest();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} n\n */\nvar LUPrefix = function(n) {\n\n};\n\n/** \n * @param {number} video\n * @return {void}\n */\nLUPrefix.prototype.upload = function(video) {\n\n};\n\n/**\n * @return {number}\n */\nLUPrefix.prototype.longest = function() {\n\n};\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * var obj = new LUPrefix(n)\n * obj.upload(video)\n * var param_2 = obj.longest()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class LUPrefix\n\n=begin\n :type n: Integer\n=end\n def initialize(n)\n\n end\n\n\n=begin\n :type video: Integer\n :rtype: Void\n=end\n def upload(video)\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def longest()\n\n end\n\n\nend\n\n# Your LUPrefix object will be instantiated and called as such:\n# obj = LUPrefix.new(n)\n# obj.upload(video)\n# param_2 = obj.longest()", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass LUPrefix {\n\n init(_ n: Int) {\n\n }\n \n func upload(_ video: Int) {\n\n }\n \n func longest() -> Int {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * let obj = LUPrefix(n)\n * obj.upload(video)\n * let ret_2: Int = obj.longest()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type LUPrefix struct {\n\n}\n\n\nfunc Constructor(n int) LUPrefix {\n\n}\n\n\nfunc (this *LUPrefix) Upload(video int) {\n\n}\n\n\nfunc (this *LUPrefix) Longest() int {\n\n}\n\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * obj := Constructor(n);\n * obj.Upload(video);\n * param_2 := obj.Longest();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class LUPrefix(_n: Int) {\n\n def upload(video: Int) {\n\n }\n\n def longest(): Int = {\n\n }\n\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * var obj = new LUPrefix(n)\n * obj.upload(video)\n * var param_2 = obj.longest()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class LUPrefix(n: Int) {\n\n fun upload(video: Int) {\n\n }\n\n fun longest(): Int {\n\n }\n\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * var obj = LUPrefix(n)\n * obj.upload(video)\n * var param_2 = obj.longest()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct LUPrefix {\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 LUPrefix {\n\n fn new(n: i32) -> Self {\n\n }\n \n fn upload(&self, video: i32) {\n\n }\n \n fn longest(&self) -> i32 {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * let obj = LUPrefix::new(n);\n * obj.upload(video);\n * let ret_2: i32 = obj.longest();\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class LUPrefix {\n /**\n * @param Integer $n\n */\n function __construct($n) {\n\n }\n\n /**\n * @param Integer $video\n * @return NULL\n */\n function upload($video) {\n\n }\n\n /**\n * @return Integer\n */\n function longest() {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * $obj = LUPrefix($n);\n * $obj->upload($video);\n * $ret_2 = $obj->longest();\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class LUPrefix {\n constructor(n: number) {\n\n }\n\n upload(video: number): void {\n\n }\n\n longest(): number {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * var obj = new LUPrefix(n)\n * obj.upload(video)\n * var param_2 = obj.longest()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define lu-prefix%\n (class object%\n (super-new)\n \n ; n : exact-integer?\n (init-field\n n)\n \n ; upload : exact-integer? -> void?\n (define/public (upload video)\n\n )\n ; longest : -> exact-integer?\n (define/public (longest)\n\n )))\n\n;; Your lu-prefix% object will be instantiated and called as such:\n;; (define obj (new lu-prefix% [n n]))\n;; (send obj upload video)\n;; (define param_2 (send obj longest))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec lu_prefix_init_(N :: integer()) -> any().\nlu_prefix_init_(N) ->\n .\n\n-spec lu_prefix_upload(Video :: integer()) -> any().\nlu_prefix_upload(Video) ->\n .\n\n-spec lu_prefix_longest() -> integer().\nlu_prefix_longest() ->\n .\n\n\n%% Your functions will be called as such:\n%% lu_prefix_init_(N),\n%% lu_prefix_upload(Video),\n%% Param_2 = lu_prefix_longest(),\n\n%% lu_prefix_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule LUPrefix do\n @spec init_(n :: integer) :: any\n def init_(n) do\n\n end\n\n @spec upload(video :: integer) :: any\n def upload(video) do\n\n end\n\n @spec longest() :: integer\n def longest() do\n\n end\nend\n\n# Your functions will be called as such:\n# LUPrefix.init_(n)\n# LUPrefix.upload(video)\n# param_2 = LUPrefix.longest()\n\n# LUPrefix.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class LUPrefix {\n\n LUPrefix(int n) {\n\n }\n \n void upload(int video) {\n\n }\n \n int longest() {\n\n }\n}\n\n/**\n * Your LUPrefix object will be instantiated and called as such:\n * LUPrefix obj = LUPrefix(n);\n * obj.upload(video);\n * int param2 = obj.longest();\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"3.5K\", \"totalSubmission\": \"6.3K\", \"totalAcceptedRaw\": 3481, \"totalSubmissionRaw\": 6338, \"acRate\": \"54.9%\"}", "hints": [ "Maintain an array keeping track of whether video “i” has been uploaded yet." ], "solution": null, "status": null, "sampleTestCase": "[\"LUPrefix\",\"upload\",\"longest\",\"upload\",\"longest\",\"upload\",\"longest\"]\n[[4],[3],[],[1],[],[2],[]]", "metaData": "{\n \"classname\": \"LUPrefix\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"n\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"video\"\n }\n ],\n \"name\": \"upload\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [],\n \"return\": {\n \"type\": \"integer\"\n },\n \"name\": \"longest\"\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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