leetcode-problemset/leetcode-cn/originData/rank-from-stream-lcci.json

{
    "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": "<p>Imagine you are reading in a stream of integers. Periodically, you wish to be able to look up the rank of a number <code>x</code> (the number of values less than or equal to <code>x</code>). lmplement the data structures and algorithms to support these operations. That is, implement the method <code>track (int x)</code>, which is called when each number is generated, and the method <code>getRankOfNumber(int x)</code>, which returns the number of values less than or equal to <code>x</code>.</p>\r\n\r\n<p><b>Note:&nbsp;</b>This problem is slightly different from the original one in the book.</p>\r\n\r\n<p><strong>Example:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong>\r\n[&quot;StreamRank&quot;, &quot;getRankOfNumber&quot;, &quot;track&quot;, &quot;getRankOfNumber&quot;]\r\n[[], [1], [0], [0]]\r\n<strong>Output:\r\n</strong>[null,0,null,1]\r\n</pre>\r\n\r\n<p><strong>Note: </strong></p>\r\n\r\n<ul>\r\n\t<li><code>x &lt;= 50000</code></li>\r\n\t<li>The number of calls of both&nbsp;<code>track</code>&nbsp;and&nbsp;<code>getRankOfNumber</code>&nbsp;methods are less than or equal to 2000.</li>\r\n</ul>\r\n",
            "translatedTitle": "数字流的秩",
            "translatedContent": "<p>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：</p>\n\n<p>实现 <code>track(int x)</code>&nbsp;方法，每读入一个数字都会调用该方法；</p>\n\n<p>实现 <code>getRankOfNumber(int x)</code> 方法，返回小于或等于 x 的值的个数。</p>\n\n<p><strong>注意：</strong>本题相对原题稍作改动</p>\n\n<p><strong>示例:</strong></p>\n\n<pre><strong>输入:</strong>\n[&quot;StreamRank&quot;, &quot;getRankOfNumber&quot;, &quot;track&quot;, &quot;getRankOfNumber&quot;]\n[[], [1], [0], [0]]\n<strong>输出:\n</strong>[null,0,null,1]\n</pre>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>x &lt;= 50000</code></li>\n\t<li><code>track</code>&nbsp;和&nbsp;<code>getRankOfNumber</code> 方法的调用次数均不超过 2000 次</li>\n</ul>\n",
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            "difficulty": "Medium",
            "likes": 47,
            "dislikes": 0,
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            "contributors": [],
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            "topicTags": [
                {
                    "name": "Design",
                    "slug": "design",
                    "translatedName": "设计",
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Binary Indexed Tree",
                    "slug": "binary-indexed-tree",
                    "translatedName": "树状数组",
                    "__typename": "TopicTagNode"
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                {
                    "name": "Binary Search",
                    "slug": "binary-search",
                    "translatedName": "二分查找",
                    "__typename": "TopicTagNode"
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                {
                    "name": "Data Stream",
                    "slug": "data-stream",
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                {
                    "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": "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": "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": "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": "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": "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": "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": "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": "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": "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": "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": "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": "Scala",
                    "langSlug": "scala",
                    "code": "class StreamRank() {\n\n    def track(x: Int) {\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 * var obj = new StreamRank()\n * obj.track(x)\n * var param_2 = obj.getRankOfNumber(x)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "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"
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                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define stream-rank%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; track : exact-integer? -> void?\n    (define/public (track x)\n\n      )\n    ; get-rank-of-number : exact-integer? -> exact-integer?\n    (define/public (get-rank-of-number x)\n\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": "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"
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                {
                    "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.",
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            "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。"
            ],
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            "status": null,
            "sampleTestCase": "[\"StreamRank\", \"getRankOfNumber\", \"track\", \"getRankOfNumber\"]\n[[], [1], [0], [0]]",
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