{ "data": { "question": { "questionId": "2161", "questionFrontendId": "2034", "categoryTitle": "Algorithms", "boundTopicId": 1033826, "title": "Stock Price Fluctuation ", "titleSlug": "stock-price-fluctuation", "content": "

You are given a stream of records about a particular stock. Each record contains a timestamp and the corresponding price of the stock at that timestamp.

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Unfortunately due to the volatile nature of the stock market, the records do not come in order. Even worse, some records may be incorrect. Another record with the same timestamp may appear later in the stream correcting the price of the previous wrong record.

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Design an algorithm that:

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Implement the StockPrice class:

\n\n\n\n

 

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Example 1:

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\nInput\n["StockPrice", "update", "update", "current", "maximum", "update", "maximum", "update", "minimum"]\n[[], [1, 10], [2, 5], [], [], [1, 3], [], [4, 2], []]\nOutput\n[null, null, null, 5, 10, null, 5, null, 2]\n\nExplanation\nStockPrice stockPrice = new StockPrice();\nstockPrice.update(1, 10); // Timestamps are [1] with corresponding prices [10].\nstockPrice.update(2, 5);  // Timestamps are [1,2] with corresponding prices [10,5].\nstockPrice.current();     // return 5, the latest timestamp is 2 with the price being 5.\nstockPrice.maximum();     // return 10, the maximum price is 10 at timestamp 1.\nstockPrice.update(1, 3);  // The previous timestamp 1 had the wrong price, so it is updated to 3.\n                          // Timestamps are [1,2] with corresponding prices [3,5].\nstockPrice.maximum();     // return 5, the maximum price is 5 after the correction.\nstockPrice.update(4, 2);  // Timestamps are [1,2,4] with corresponding prices [3,5,2].\nstockPrice.minimum();     // return 2, the minimum price is 2 at timestamp 4.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "股票价格波动", "translatedContent": "

给你一支股票价格的数据流。数据流中每一条记录包含一个 时间戳 和该时间点股票对应的 价格 。

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不巧的是，由于股票市场内在的波动性，股票价格记录可能不是按时间顺序到来的。某些情况下，有的记录可能是错的。如果两个有相同时间戳的记录出现在数据流中，前一条记录视为错误记录，后出现的记录 更正 前一条错误的记录。

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请你设计一个算法，实现：

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请你实现 StockPrice 类：

\n\n\n\n

 

\n\n

示例 1：

\n\n
输入：\n[\"StockPrice\", \"update\", \"update\", \"current\", \"maximum\", \"update\", \"maximum\", \"update\", \"minimum\"]\n[[], [1, 10], [2, 5], [], [], [1, 3], [], [4, 2], []]\n输出：\n[null, null, null, 5, 10, null, 5, null, 2]\n\n解释：\nStockPrice stockPrice = new StockPrice();\nstockPrice.update(1, 10); // 时间戳为 [1] ，对应的股票价格为 [10] 。\nstockPrice.update(2, 5);  // 时间戳为 [1,2] ，对应的股票价格为 [10,5] 。\nstockPrice.current();     // 返回 5 ，最新时间戳为 2 ，对应价格为 5 。\nstockPrice.maximum();     // 返回 10 ，最高价格的时间戳为 1 ，价格为 10 。\nstockPrice.update(1, 3);  // 之前时间戳为 1 的价格错误，价格更新为 3 。\n                          // 时间戳为 [1,2] ，对应股票价格为 [3,5] 。\nstockPrice.maximum();     // 返回 5 ，更正后最高价格为 5 。\nstockPrice.update(4, 2);  // 时间戳为 [1,2,4] ，对应价格为 [3,5,2] 。\nstockPrice.minimum();     // 返回 2 ，最低价格时间戳为 4 ，价格为 2 。\n
\n\n

 

\n\n

提示：

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minimum() {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * StockPrice obj = new StockPrice();\n * obj.update(timestamp,price);\n * int param_2 = obj.current();\n * int param_3 = obj.maximum();\n * int param_4 = obj.minimum();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class StockPrice(object):\n\n def __init__(self):\n\n\n def update(self, timestamp, price):\n \"\"\"\n :type timestamp: int\n :type price: int\n :rtype: None\n \"\"\"\n\n\n def current(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n def maximum(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n def minimum(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n\n# Your StockPrice object will be instantiated and called as such:\n# obj = StockPrice()\n# obj.update(timestamp,price)\n# param_2 = obj.current()\n# param_3 = obj.maximum()\n# param_4 = obj.minimum()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class StockPrice:\n\n def __init__(self):\n\n\n def update(self, timestamp: int, price: int) -> None:\n\n\n def current(self) -> int:\n\n\n def maximum(self) -> int:\n\n\n def minimum(self) -> int:\n\n\n\n# Your StockPrice object will be instantiated and called as such:\n# obj = StockPrice()\n# obj.update(timestamp,price)\n# param_2 = obj.current()\n# param_3 = obj.maximum()\n# param_4 = obj.minimum()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} StockPrice;\n\n\nStockPrice* stockPriceCreate() {\n\n}\n\nvoid stockPriceUpdate(StockPrice* obj, int timestamp, int price) {\n\n}\n\nint stockPriceCurrent(StockPrice* obj) {\n\n}\n\nint stockPriceMaximum(StockPrice* obj) {\n\n}\n\nint stockPriceMinimum(StockPrice* obj) {\n\n}\n\nvoid stockPriceFree(StockPrice* obj) {\n\n}\n\n/**\n * Your StockPrice struct will be instantiated and called as such:\n * StockPrice* obj = stockPriceCreate();\n * stockPriceUpdate(obj, timestamp, price);\n \n * int param_2 = stockPriceCurrent(obj);\n \n * int param_3 = stockPriceMaximum(obj);\n \n * int param_4 = stockPriceMinimum(obj);\n \n * stockPriceFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class StockPrice {\n\n public StockPrice() {\n\n }\n \n public void Update(int timestamp, int price) {\n\n }\n \n public int Current() {\n\n }\n \n public int Maximum() {\n\n }\n \n public int Minimum() {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * StockPrice obj = new StockPrice();\n * obj.Update(timestamp,price);\n * int param_2 = obj.Current();\n * int param_3 = obj.Maximum();\n * int param_4 = obj.Minimum();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar StockPrice = function() {\n\n};\n\n/** \n * @param {number} timestamp \n * @param {number} price\n * @return {void}\n */\nStockPrice.prototype.update = function(timestamp, price) {\n\n};\n\n/**\n * @return {number}\n */\nStockPrice.prototype.current = function() {\n\n};\n\n/**\n * @return {number}\n */\nStockPrice.prototype.maximum = function() {\n\n};\n\n/**\n * @return {number}\n */\nStockPrice.prototype.minimum = function() {\n\n};\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * var obj = new StockPrice()\n * obj.update(timestamp,price)\n * var param_2 = obj.current()\n * var param_3 = obj.maximum()\n * var param_4 = obj.minimum()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class StockPrice\n def initialize()\n\n end\n\n\n=begin\n :type timestamp: Integer\n :type price: Integer\n :rtype: Void\n=end\n def update(timestamp, price)\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def current()\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def maximum()\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def minimum()\n\n end\n\n\nend\n\n# Your StockPrice object will be instantiated and called as such:\n# obj = StockPrice.new()\n# obj.update(timestamp, price)\n# param_2 = obj.current()\n# param_3 = obj.maximum()\n# param_4 = obj.minimum()", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass StockPrice {\n\n init() {\n\n }\n \n func update(_ timestamp: Int, _ price: Int) {\n\n }\n \n func current() -> Int {\n\n }\n \n func maximum() -> Int {\n\n }\n \n func minimum() -> Int {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * let obj = StockPrice()\n * obj.update(timestamp, price)\n * let ret_2: Int = obj.current()\n * let ret_3: Int = obj.maximum()\n * let ret_4: Int = obj.minimum()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type StockPrice struct {\n\n}\n\n\nfunc Constructor() StockPrice {\n\n}\n\n\nfunc (this *StockPrice) Update(timestamp int, price int) {\n\n}\n\n\nfunc (this *StockPrice) Current() int {\n\n}\n\n\nfunc (this *StockPrice) Maximum() int {\n\n}\n\n\nfunc (this *StockPrice) Minimum() int {\n\n}\n\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Update(timestamp,price);\n * param_2 := obj.Current();\n * param_3 := obj.Maximum();\n * param_4 := obj.Minimum();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class StockPrice() {\n\n def update(timestamp: Int, price: Int) {\n\n }\n\n def current(): Int = {\n\n }\n\n def maximum(): Int = {\n\n }\n\n def minimum(): Int = {\n\n }\n\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * var obj = new StockPrice()\n * obj.update(timestamp,price)\n * var param_2 = obj.current()\n * var param_3 = obj.maximum()\n * var param_4 = obj.minimum()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class StockPrice() {\n\n fun update(timestamp: Int, price: Int) {\n\n }\n\n fun current(): Int {\n\n }\n\n fun maximum(): Int {\n\n }\n\n fun minimum(): Int {\n\n }\n\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * var obj = StockPrice()\n * obj.update(timestamp,price)\n * var param_2 = obj.current()\n * var param_3 = obj.maximum()\n * var param_4 = obj.minimum()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct StockPrice {\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 StockPrice {\n\n fn new() -> Self {\n\n }\n \n fn update(&self, timestamp: i32, price: i32) {\n\n }\n \n fn current(&self) -> i32 {\n\n }\n \n fn maximum(&self) -> i32 {\n\n }\n \n fn minimum(&self) -> i32 {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * let obj = StockPrice::new();\n * obj.update(timestamp, price);\n * let ret_2: i32 = obj.current();\n * let ret_3: i32 = obj.maximum();\n * let ret_4: i32 = obj.minimum();\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class StockPrice {\n /**\n */\n function __construct() {\n\n }\n\n /**\n * @param Integer $timestamp\n * @param Integer $price\n * @return NULL\n */\n function update($timestamp, $price) {\n\n }\n\n /**\n * @return Integer\n */\n function current() {\n\n }\n\n /**\n * @return Integer\n */\n function maximum() {\n\n }\n\n /**\n * @return Integer\n */\n function minimum() {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * $obj = StockPrice();\n * $obj->update($timestamp, $price);\n * $ret_2 = $obj->current();\n * $ret_3 = $obj->maximum();\n * $ret_4 = $obj->minimum();\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class StockPrice {\n constructor() {\n\n }\n\n update(timestamp: number, price: number): void {\n\n }\n\n current(): number {\n\n }\n\n maximum(): number {\n\n }\n\n minimum(): number {\n\n }\n}\n\n/**\n * Your StockPrice object will be instantiated and called as such:\n * var obj = new StockPrice()\n * obj.update(timestamp,price)\n * var param_2 = obj.current()\n * var param_3 = obj.maximum()\n * var param_4 = obj.minimum()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define stock-price%\n (class object%\n (super-new)\n (init-field)\n \n ; update : exact-integer? exact-integer? -> void?\n (define/public (update timestamp price)\n\n )\n ; current : -> exact-integer?\n (define/public (current)\n\n )\n ; maximum : -> exact-integer?\n (define/public (maximum)\n\n )\n ; minimum : -> exact-integer?\n (define/public (minimum)\n\n )))\n\n;; Your stock-price% object will be instantiated and called as such:\n;; (define obj (new stock-price%))\n;; (send obj update timestamp price)\n;; (define param_2 (send obj current))\n;; (define param_3 (send obj maximum))\n;; (define param_4 (send obj minimum))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec stock_price_init_() -> any().\nstock_price_init_() ->\n .\n\n-spec stock_price_update(Timestamp :: integer(), Price :: integer()) -> any().\nstock_price_update(Timestamp, Price) ->\n .\n\n-spec stock_price_current() -> integer().\nstock_price_current() ->\n .\n\n-spec stock_price_maximum() -> integer().\nstock_price_maximum() ->\n .\n\n-spec stock_price_minimum() -> integer().\nstock_price_minimum() ->\n .\n\n\n%% Your functions will be called as such:\n%% stock_price_init_(),\n%% stock_price_update(Timestamp, Price),\n%% Param_2 = stock_price_current(),\n%% Param_3 = stock_price_maximum(),\n%% Param_4 = stock_price_minimum(),\n\n%% stock_price_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule StockPrice do\n @spec init_() :: any\n def init_() do\n\n end\n\n @spec update(timestamp :: integer, price :: integer) :: any\n def update(timestamp, price) do\n\n end\n\n @spec current() :: integer\n def current() do\n\n end\n\n @spec maximum() :: integer\n def maximum() do\n\n end\n\n @spec minimum() :: integer\n def minimum() do\n\n end\nend\n\n# Your functions will be called as such:\n# StockPrice.init_()\n# StockPrice.update(timestamp, price)\n# param_2 = StockPrice.current()\n# param_3 = StockPrice.maximum()\n# param_4 = StockPrice.minimum()\n\n# StockPrice.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"20.9K\", \"totalSubmission\": \"44.6K\", \"totalAcceptedRaw\": 20920, \"totalSubmissionRaw\": 44600, \"acRate\": \"46.9%\"}", "hints": [ "How would you solve the problem for offline queries (all queries given at once)?", "Think about which data structure can help insert and delete the most optimal way." ], "solution": null, 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