{ "data": { "question": { "questionId": "1000041", "questionFrontendId": "面试题 10.10", "categoryTitle": "LCCI", "boundTopicId": 99444, "title": "Rank from Stream LCCI", "titleSlug": "rank-from-stream-lcci", "content": "

Imagine you are reading in a stream of integers. Periodically, you wish to be able to look up the rank of a number x (the number of values less than or equal to x). lmplement the data structures and algorithms to support these operations. That is, implement the method track (int x), which is called when each number is generated, and the method getRankOfNumber(int x), which returns the number of values less than or equal to x.

\r\n\r\n

Note: This problem is slightly different from the original one in the book.

\r\n\r\n

Example:

\r\n\r\n
\r\nInput:\r\n["StreamRank", "getRankOfNumber", "track", "getRankOfNumber"]\r\n[[], [1], [0], [0]]\r\nOutput:\r\n[null,0,null,1]\r\n
\r\n\r\n

Note:

\r\n\r\n\r\n", "translatedTitle": "数字流的秩", "translatedContent": "

假设你正在读取一串整数。每隔一段时间，你希望能找出数字 x 的秩(小于或等于 x 的值的个数)。请实现数据结构和算法来支持这些操作，也就是说：

\n\n

实现 track(int x) 方法，每读入一个数字都会调用该方法；

\n\n

实现 getRankOfNumber(int x) 方法，返回小于或等于 x 的值的个数。

\n\n

注意：本题相对原题稍作改动

\n\n

示例：

\n\n
\n输入：\n[\"StreamRank\", \"getRankOfNumber\", \"track\", \"getRankOfNumber\"]\n[[], [1], [0], [0]]\n输出：\n[null,0,null,1]\n
\n\n

提示：

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"slug": "binary-search", "translatedName": "二分查找", "__typename": "TopicTagNode" }, { "name": "Data Stream", "slug": "data-stream", "translatedName": "数据流", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class StreamRank {\npublic:\n StreamRank() {\n \n }\n \n void track(int x) {\n \n }\n \n int getRankOfNumber(int x) {\n \n }\n};\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * StreamRank* obj = new StreamRank();\n * obj->track(x);\n * int param_2 = obj->getRankOfNumber(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class StreamRank {\n\n public StreamRank() {\n \n }\n \n public void track(int x) {\n \n }\n \n public int getRankOfNumber(int x) {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * StreamRank obj = new StreamRank();\n * obj.track(x);\n * int param_2 = obj.getRankOfNumber(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class StreamRank:\n\n def __init__(self):\n \n\n def track(self, x: int) -> None:\n \n\n def getRankOfNumber(self, x: int) -> int:\n \n\n\n# Your StreamRank object will be instantiated and called as such:\n# obj = StreamRank()\n# obj.track(x)\n# param_2 = obj.getRankOfNumber(x)", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class StreamRank(object):\n\n def __init__(self):\n \n\n def track(self, x):\n \"\"\"\n :type x: int\n :rtype: None\n \"\"\"\n \n\n def getRankOfNumber(self, x):\n \"\"\"\n :type x: int\n :rtype: int\n \"\"\"\n \n\n\n# Your StreamRank object will be instantiated and called as such:\n# obj = StreamRank()\n# obj.track(x)\n# param_2 = obj.getRankOfNumber(x)", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar StreamRank = function() {\n \n};\n\n/** \n * @param {number} x\n * @return {void}\n */\nStreamRank.prototype.track = function(x) {\n \n};\n\n/** \n * @param {number} x\n * @return {number}\n */\nStreamRank.prototype.getRankOfNumber = function(x) {\n \n};\n\n/** \n * Your StreamRank object will be instantiated and called as such:\n * var obj = new StreamRank()\n * obj.track(x)\n * var param_2 = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class StreamRank {\n constructor() {\n \n }\n\n track(x: number): void {\n \n }\n\n getRankOfNumber(x: number): number {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * var obj = new StreamRank()\n * obj.track(x)\n * var param_2 = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class StreamRank {\n\n public StreamRank() {\n \n }\n \n public void Track(int x) {\n \n }\n \n public int GetRankOfNumber(int x) {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * StreamRank obj = new StreamRank();\n * obj.Track(x);\n * int param_2 = obj.GetRankOfNumber(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} StreamRank;\n\n\nStreamRank* streamRankCreate() {\n \n}\n\nvoid streamRankTrack(StreamRank* obj, int x) {\n \n}\n\nint streamRankGetRankOfNumber(StreamRank* obj, int x) {\n \n}\n\nvoid streamRankFree(StreamRank* obj) {\n \n}\n\n/**\n * Your StreamRank struct will be instantiated and called as such:\n * StreamRank* obj = streamRankCreate();\n * streamRankTrack(obj, x);\n \n * int param_2 = streamRankGetRankOfNumber(obj, x);\n \n * streamRankFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type StreamRank struct {\n \n}\n\n\nfunc Constructor() StreamRank {\n \n}\n\n\nfunc (this *StreamRank) Track(x int) {\n \n}\n\n\nfunc (this *StreamRank) GetRankOfNumber(x int) int {\n \n}\n\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Track(x);\n * param_2 := obj.GetRankOfNumber(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class StreamRank() {\n\n fun track(x: Int) {\n \n }\n\n fun getRankOfNumber(x: Int): Int {\n \n }\n\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * var obj = StreamRank()\n * obj.track(x)\n * var param_2 = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass StreamRank {\n\n init() {\n \n }\n \n func track(_ x: Int) {\n \n }\n \n func getRankOfNumber(_ x: Int) -> Int {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * let obj = StreamRank()\n * obj.track(x)\n * let ret_2: Int = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct StreamRank {\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 StreamRank {\n\n fn new() -> Self {\n \n }\n \n fn track(&self, x: i32) {\n \n }\n \n fn get_rank_of_number(&self, x: i32) -> i32 {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * let obj = StreamRank::new();\n * obj.track(x);\n * let ret_2: i32 = obj.get_rank_of_number(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class StreamRank\n def initialize()\n \n end\n\n\n=begin\n :type x: Integer\n :rtype: Void\n=end\n def track(x)\n \n end\n\n\n=begin\n :type x: Integer\n :rtype: Integer\n=end\n def get_rank_of_number(x)\n \n end\n\n\nend\n\n# Your StreamRank object will be instantiated and called as such:\n# obj = StreamRank.new()\n# obj.track(x)\n# param_2 = obj.get_rank_of_number(x)", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class StreamRank {\n /**\n */\n function __construct() {\n \n }\n \n /**\n * @param Integer $x\n * @return NULL\n */\n function track($x) {\n \n }\n \n /**\n * @param Integer $x\n * @return Integer\n */\n function getRankOfNumber($x) {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * $obj = StreamRank();\n * $obj->track($x);\n * $ret_2 = $obj->getRankOfNumber($x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class StreamRank {\n\n StreamRank() {\n \n }\n \n void track(int x) {\n \n }\n \n int getRankOfNumber(int x) {\n \n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * StreamRank obj = StreamRank();\n * obj.track(x);\n * int param2 = obj.getRankOfNumber(x);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class StreamRank() {\n\n def track(x: Int): Unit = {\n \n }\n\n def getRankOfNumber(x: Int): Int = {\n \n }\n\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * val obj = new StreamRank()\n * obj.track(x)\n * val param_2 = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule StreamRank do\n @spec init_() :: any\n def init_() do\n \n end\n\n @spec track(x :: integer) :: any\n def track(x) do\n \n end\n\n @spec get_rank_of_number(x :: integer) :: integer\n def get_rank_of_number(x) do\n \n end\nend\n\n# Your functions will be called as such:\n# StreamRank.init_()\n# StreamRank.track(x)\n# param_2 = StreamRank.get_rank_of_number(x)\n\n# StreamRank.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec stream_rank_init_() -> any().\nstream_rank_init_() ->\n .\n\n-spec stream_rank_track(X :: integer()) -> any().\nstream_rank_track(X) ->\n .\n\n-spec stream_rank_get_rank_of_number(X :: integer()) -> integer().\nstream_rank_get_rank_of_number(X) ->\n .\n\n\n%% Your functions will be called as such:\n%% stream_rank_init_(),\n%% stream_rank_track(X),\n%% Param_2 = stream_rank_get_rank_of_number(X),\n\n%% stream_rank_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define stream-rank%\n (class object%\n (super-new)\n \n (init-field)\n \n ; track : exact-integer? -> void?\n (define/public (track x)\n )\n ; get-rank-of-number : exact-integer? -> exact-integer?\n (define/public (get-rank-of-number x)\n )))\n\n;; Your stream-rank% object will be instantiated and called as such:\n;; (define obj (new stream-rank%))\n;; (send obj track x)\n;; (define param_2 (send obj get-rank-of-number x))", "__typename": "CodeSnippetNode" }, { "lang": "Cangjie", "langSlug": "cangjie", "code": "class StreamRank {\n init() {\n\n }\n \n func track(x: Int64): Unit {\n\n }\n \n func getRankOfNumber(x: Int64): Int64 {\n\n }\n}\n\n/**\n * Your StreamRank object will be instantiated and called as such:\n * let obj: StreamRank = StreamRank()\n * obj.track(x)\n * let param_2 = obj.getRankOfNumber(x)\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"12.3K\", \"totalSubmission\": \"19.6K\", \"totalAcceptedRaw\": 12288, \"totalSubmissionRaw\": 19630, \"acRate\": \"62.6%\"}", "hints": [ "使用数组存在的问题是插入一个数字会比较慢。我们还能使用其他的数据结构吗？", "二叉搜索树效果好吗？", "考虑一个二叉搜索树，其中每个节点存储一些额外的数据。" ], "solution": null, "status": null, "sampleTestCase": "[\"StreamRank\", \"getRankOfNumber\", \"track\", \"getRankOfNumber\"]\n[[], [1], [0], [0]]", "metaData": "{\r\n \"classname\": \"StreamRank\",\r\n \"maxbytesperline\": 200000,\r\n \"constructor\": {\r\n \"params\": [\r\n ]\r\n },\r\n \"methods\": [\r\n {\r\n \"name\" : \"track\",\r\n \"params\": [\r\n {\r\n \"type\": \"integer\",\r\n \"name\": \"x\"\r\n }\r\n ],\r\n 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