{ "data": { "question": { "questionId": "1775", "questionFrontendId": "1656", "boundTopicId": null, "title": "Design an Ordered Stream", "titleSlug": "design-an-ordered-stream", "content": "

There is a stream of n (idKey, value) pairs arriving in an arbitrary order, where idKey is an integer between 1 and n and value is a string. No two pairs have the same id.

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Design a stream that returns the values in increasing order of their IDs by returning a chunk (list) of values after each insertion. The concatenation of all the chunks should result in a list of the sorted values.

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Implement the OrderedStream class:

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Example:

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\"\"

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\nInput\n["OrderedStream", "insert", "insert", "insert", "insert", "insert"]\n[[5], [3, "ccccc"], [1, "aaaaa"], [2, "bbbbb"], [5, "eeeee"], [4, "ddddd"]]\nOutput\n[null, [], ["aaaaa"], ["bbbbb", "ccccc"], [], ["ddddd", "eeeee"]]\n\nExplanation\n// Note that the values ordered by ID is ["aaaaa", "bbbbb", "ccccc", "ddddd", "eeeee"].\nOrderedStream os = new OrderedStream(5);\nos.insert(3, "ccccc"); // Inserts (3, "ccccc"), returns [].\nos.insert(1, "aaaaa"); // Inserts (1, "aaaaa"), returns ["aaaaa"].\nos.insert(2, "bbbbb"); // Inserts (2, "bbbbb"), returns ["bbbbb", "ccccc"].\nos.insert(5, "eeeee"); // Inserts (5, "eeeee"), returns [].\nos.insert(4, "ddddd"); // Inserts (4, "ddddd"), returns ["ddddd", "eeeee"].\n// Concatentating all the chunks returned:\n// [] + ["aaaaa"] + ["bbbbb", "ccccc"] + [] + ["ddddd", "eeeee"] = ["aaaaa", "bbbbb", "ccccc", "ddddd", "eeeee"]\n// The resulting order is the same as the order above.\n
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Constraints:

\n\n\n", "translatedTitle": null, "translatedContent": null, "isPaidOnly": false, "difficulty": "Easy", "likes": 205, "dislikes": 1716, "isLiked": null, "similarQuestions": "[]", "exampleTestcases": "[\"OrderedStream\",\"insert\",\"insert\",\"insert\",\"insert\",\"insert\"]\n[[5],[3,\"ccccc\"],[1,\"aaaaa\"],[2,\"bbbbb\"],[5,\"eeeee\"],[4,\"ddddd\"]]", "categoryTitle": "Algorithms", "contributors": [], "topicTags": [ { "name": "Array", "slug": "array", "translatedName": null, "__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": null, "__typename": "TopicTagNode" }, { "name": "Design", "slug": "design", "translatedName": null, "__typename": "TopicTagNode" }, { "name": "Data Stream", "slug": "data-stream", "translatedName": null, "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class OrderedStream {\npublic:\n OrderedStream(int n) {\n \n }\n \n vector insert(int idKey, string value) {\n \n }\n};\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * OrderedStream* obj = new OrderedStream(n);\n * vector param_1 = obj->insert(idKey,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class OrderedStream {\n\n public OrderedStream(int n) {\n \n }\n \n public List insert(int idKey, String value) {\n \n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * OrderedStream obj = new OrderedStream(n);\n * List param_1 = obj.insert(idKey,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class OrderedStream(object):\n\n def __init__(self, n):\n \"\"\"\n :type n: int\n \"\"\"\n \n\n def insert(self, idKey, value):\n \"\"\"\n :type idKey: int\n :type value: str\n :rtype: List[str]\n \"\"\"\n \n\n\n# Your OrderedStream object will be instantiated and called as such:\n# obj = OrderedStream(n)\n# param_1 = obj.insert(idKey,value)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class OrderedStream:\n\n def __init__(self, n: int):\n \n\n def insert(self, idKey: int, value: str) -> List[str]:\n \n\n\n# Your OrderedStream object will be instantiated and called as such:\n# obj = OrderedStream(n)\n# param_1 = obj.insert(idKey,value)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} OrderedStream;\n\n\nOrderedStream* orderedStreamCreate(int n) {\n \n}\n\nchar ** orderedStreamInsert(OrderedStream* obj, int idKey, char * value, int* retSize) {\n \n}\n\nvoid orderedStreamFree(OrderedStream* obj) {\n \n}\n\n/**\n * Your OrderedStream struct will be instantiated and called as such:\n * OrderedStream* obj = orderedStreamCreate(n);\n * char ** param_1 = orderedStreamInsert(obj, idKey, value, retSize);\n \n * orderedStreamFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class OrderedStream {\n\n public OrderedStream(int n) {\n \n }\n \n public IList Insert(int idKey, string value) {\n \n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * OrderedStream obj = new OrderedStream(n);\n * IList param_1 = obj.Insert(idKey,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} n\n */\nvar OrderedStream = function(n) {\n \n};\n\n/** \n * @param {number} idKey \n * @param {string} value\n * @return {string[]}\n */\nOrderedStream.prototype.insert = function(idKey, value) {\n \n};\n\n/** \n * Your OrderedStream object will be instantiated and called as such:\n * var obj = new OrderedStream(n)\n * var param_1 = obj.insert(idKey,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class OrderedStream\n\n=begin\n :type n: Integer\n=end\n def initialize(n)\n \n end\n\n\n=begin\n :type id_key: Integer\n :type value: String\n :rtype: String[]\n=end\n def insert(id_key, value)\n \n end\n\n\nend\n\n# Your OrderedStream object will be instantiated and called as such:\n# obj = OrderedStream.new(n)\n# param_1 = obj.insert(id_key, value)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass OrderedStream {\n\n init(_ n: Int) {\n \n }\n \n func insert(_ idKey: Int, _ value: String) -> [String] {\n \n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * let obj = OrderedStream(n)\n * let ret_1: [String] = obj.insert(idKey, value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type OrderedStream struct {\n \n}\n\n\nfunc Constructor(n int) OrderedStream {\n \n}\n\n\nfunc (this *OrderedStream) Insert(idKey int, value string) []string {\n \n}\n\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * obj := Constructor(n);\n * param_1 := obj.Insert(idKey,value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class OrderedStream(_n: Int) {\n\n def insert(idKey: Int, value: String): List[String] = {\n \n }\n\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * var obj = new OrderedStream(n)\n * var param_1 = obj.insert(idKey,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class OrderedStream(n: Int) {\n\n fun insert(idKey: Int, value: String): List {\n \n }\n\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * var obj = OrderedStream(n)\n * var param_1 = obj.insert(idKey,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct OrderedStream {\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 OrderedStream {\n\n fn new(n: i32) -> Self {\n \n }\n \n fn insert(&self, id_key: i32, value: String) -> Vec {\n \n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * let obj = OrderedStream::new(n);\n * let ret_1: Vec = obj.insert(idKey, value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class OrderedStream {\n /**\n * @param Integer $n\n */\n function __construct($n) {\n \n }\n \n /**\n * @param Integer $idKey\n * @param String $value\n * @return String[]\n */\n function insert($idKey, $value) {\n \n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * $obj = OrderedStream($n);\n * $ret_1 = $obj->insert($idKey, $value);\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class OrderedStream {\n constructor(n: number) {\n\n }\n\n insert(idKey: number, value: string): string[] {\n\n }\n}\n\n/**\n * Your OrderedStream object will be instantiated and called as such:\n * var obj = new OrderedStream(n)\n * var param_1 = obj.insert(idKey,value)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define ordered-stream%\n (class object%\n (super-new)\n\n ; n : exact-integer?\n (init-field\n n)\n \n ; insert : exact-integer? string? -> (listof string?)\n (define/public (insert id-key value)\n\n )))\n\n;; Your ordered-stream% object will be instantiated and called as such:\n;; (define obj (new ordered-stream% [n n]))\n;; (define param_1 (send obj insert id-key value))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec ordered_stream_init_(N :: integer()) -> any().\nordered_stream_init_(N) ->\n .\n\n-spec ordered_stream_insert(IdKey :: integer(), Value :: unicode:unicode_binary()) -> [unicode:unicode_binary()].\nordered_stream_insert(IdKey, Value) ->\n .\n\n\n%% Your functions will be called as such:\n%% ordered_stream_init_(N),\n%% Param_1 = ordered_stream_insert(IdKey, Value),\n\n%% ordered_stream_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule OrderedStream do\n @spec init_(n :: integer) :: any\n def init_(n) do\n\n end\n\n @spec insert(id_key :: integer, value :: String.t) :: [String.t]\n def insert(id_key, value) do\n\n end\nend\n\n# Your functions will be called as such:\n# OrderedStream.init_(n)\n# param_1 = OrderedStream.insert(id_key, value)\n\n# OrderedStream.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"36.1K\", \"totalSubmission\": \"43.2K\", \"totalAcceptedRaw\": 36143, \"totalSubmissionRaw\": 43154, \"acRate\": \"83.8%\"}", "hints": [ "Maintain the next id that should be outputted.", "Maintain the ids that were inserted in the stream.", "Per each insert, make a loop where you check if the id that has the turn has been inserted, and if so increment the id that has the turn and continue the loop, else break." ], "solution": null, "status": null, "sampleTestCase": "[\"OrderedStream\",\"insert\",\"insert\",\"insert\",\"insert\",\"insert\"]\n[[5],[3,\"ccccc\"],[1,\"aaaaa\"],[2,\"bbbbb\"],[5,\"eeeee\"],[4,\"ddddd\"]]", "metaData": "{\n \"classname\": \"OrderedStream\",\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\": \"idKey\"\n },\n {\n \"type\": \"string\",\n \"name\": \"value\"\n }\n ],\n \"name\": \"insert\",\n \"return\": {\n \"type\": \"list\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "enableTestMode": false, "enableDebugger": true, "envInfo": "{\"cpp\": [\"C++\", \"

Compiled with clang 11 using the latest C++ 17 standard.

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Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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Most standard library headers are already included automatically for your convenience.

\"], \"java\": [\"Java\", \"

OpenJDK 17 . Java 8 features such as lambda expressions and stream API can be used.

\\r\\n\\r\\n

Most standard library headers are already included automatically for your convenience.

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Includes Pair class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.

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Python 2.7.12.

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Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

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For Map/TreeMap data structure, you may use sortedcontainers library.

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Note that Python 2.7 will not be maintained past 2020. For the latest Python, please choose Python3 instead.

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Compiled with gcc 8.2 using the gnu99 standard.

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Your code is compiled with level one optimization (-O1). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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Most standard library headers are already included automatically for your convenience.

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For hash table operations, you may use uthash. \\\"uthash.h\\\" is included by default. Below are some examples:

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1. Adding an item to a hash.\\r\\n

\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n
\\r\\n

\\r\\n\\r\\n

2. Looking up an item in a hash:\\r\\n

\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n
\\r\\n

\\r\\n\\r\\n

3. Deleting an item in a hash:\\r\\n

\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n
\\r\\n

\"], \"csharp\": [\"C#\", \"

C# 10 with .NET 6 runtime

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Your code is compiled with debug flag enabled (/debug).

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Node.js 16.13.2.

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Your code is run with --harmony flag, enabling new ES6 features.

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lodash.js library is included by default.

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For Priority Queue / Queue data structures, you may use datastructures-js/priority-queue and datastructures-js/queue.

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Ruby 3.1

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Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms

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Swift 5.5.2.

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Go 1.17.6.

\\r\\n\\r\\n

Support https://godoc.org/github.com/emirpasic/gods library.

\"], \"python3\": [\"Python3\", \"

Python 3.10.

\\r\\n\\r\\n

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For Map/TreeMap data structure, you may use sortedcontainers library.

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Scala 2.13.7.

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Kotlin 1.3.10.

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Rust 1.58.1

\\r\\n\\r\\n

Supports rand v0.6\\u00a0from crates.io

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PHP 8.1.

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With bcmath module

\"], \"typescript\": [\"Typescript\", \"

TypeScript 4.5.4, Node.js 16.13.2.

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Your code is run with --harmony flag, enabling new ES2020 features.

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lodash.js library is included by default.

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Run with Racket 8.3.

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