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182 lines
44 KiB
JSON
182 lines
44 KiB
JSON
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"title": "Design Underground System",
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"content": "<p>An underground railway system is keeping track of customer travel times between different stations. They are using this data to calculate the average time it takes to travel from one station to another.</p>\n\n<p>Implement the <code>UndergroundSystem</code> class:</p>\n\n<ul>\n\t<li><code>void checkIn(int id, string stationName, int t)</code>\n\n\t<ul>\n\t\t<li>A customer with a card ID equal to <code>id</code>, checks in at the station <code>stationName</code> at time <code>t</code>.</li>\n\t\t<li>A customer can only be checked into one place at a time.</li>\n\t</ul>\n\t</li>\n\t<li><code>void checkOut(int id, string stationName, int t)</code>\n\t<ul>\n\t\t<li>A customer with a card ID equal to <code>id</code>, checks out from the station <code>stationName</code> at time <code>t</code>.</li>\n\t</ul>\n\t</li>\n\t<li><code>double getAverageTime(string startStation, string endStation)</code>\n\t<ul>\n\t\t<li>Returns the average time it takes to travel from <code>startStation</code> to <code>endStation</code>.</li>\n\t\t<li>The average time is computed from all the previous traveling times from <code>startStation</code> to <code>endStation</code> that happened <strong>directly</strong>, meaning a check in at <code>startStation</code> followed by a check out from <code>endStation</code>.</li>\n\t\t<li>The time it takes to travel from <code>startStation</code> to <code>endStation</code> <strong>may be different</strong> from the time it takes to travel from <code>endStation</code> to <code>startStation</code>.</li>\n\t\t<li>There will be at least one customer that has traveled from <code>startStation</code> to <code>endStation</code> before <code>getAverageTime</code> is called.</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>You may assume all calls to the <code>checkIn</code> and <code>checkOut</code> methods are consistent. If a customer checks in at time <code>t<sub>1</sub></code> then checks out at time <code>t<sub>2</sub></code>, then <code>t<sub>1</sub> < t<sub>2</sub></code>. All events happen in chronological order.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["UndergroundSystem","checkIn","checkIn","checkIn","checkOut","checkOut","checkOut","getAverageTime","getAverageTime","checkIn","getAverageTime","checkOut","getAverageTime"]\n[[],[45,"Leyton",3],[32,"Paradise",8],[27,"Leyton",10],[45,"Waterloo",15],[27,"Waterloo",20],[32,"Cambridge",22],["Paradise","Cambridge"],["Leyton","Waterloo"],[10,"Leyton",24],["Leyton","Waterloo"],[10,"Waterloo",38],["Leyton","Waterloo"]]\n\n<strong>Output</strong>\n[null,null,null,null,null,null,null,14.00000,11.00000,null,11.00000,null,12.00000]\n\n<strong>Explanation</strong>\nUndergroundSystem undergroundSystem = new UndergroundSystem();\nundergroundSystem.checkIn(45, "Leyton", 3);\nundergroundSystem.checkIn(32, "Paradise", 8);\nundergroundSystem.checkIn(27, "Leyton", 10);\nundergroundSystem.checkOut(45, "Waterloo", 15); // Customer 45 "Leyton" -> "Waterloo" in 15-3 = 12\nundergroundSystem.checkOut(27, "Waterloo", 20); // Customer 27 "Leyton" -> "Waterloo" in 20-10 = 10\nundergroundSystem.checkOut(32, "Cambridge", 22); // Customer 32 "Paradise" -> "Cambridge" in 22-8 = 14\nundergroundSystem.getAverageTime("Paradise", "Cambridge"); // return 14.00000. One trip "Paradise" -> "Cambridge", (14) / 1 = 14\nundergroundSystem.getAverageTime("Leyton", "Waterloo"); // return 11.00000. Two trips "Leyton" -> "Waterloo", (10 + 12) / 2 = 11\nundergroundSystem.checkIn(10, "Leyton", 24);\nundergroundSystem.getAverageTime("Leyton", "Waterloo"); // return 11.00000\nundergroundSystem.checkOut(10, "Waterloo", 38); // Customer 10 "Leyton" -> "Waterloo" in 38-24 = 14\nundergroundSystem.getAverageTime("Leyton", "Waterloo"); // return 12.00000. Three trips "Leyton" -> "Waterloo", (10 + 12 + 14) / 3 = 12\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["UndergroundSystem","checkIn","checkOut","getAverageTime","checkIn","checkOut","getAverageTime","checkIn","checkOut","getAverageTime"]\n[[],[10,"Leyton",3],[10,"Paradise",8],["Leyton","Paradise"],[5,"Leyton",10],[5,"Paradise",16],["Leyton","Paradise"],[2,"Leyton",21],[2,"Paradise",30],["Leyton","Paradise"]]\n\n<strong>Output</strong>\n[null,null,null,5.00000,null,null,5.50000,null,null,6.66667]\n\n<strong>Explanation</strong>\nUndergroundSystem undergroundSystem = new UndergroundSystem();\nundergroundSystem.checkIn(10, "Leyton", 3);\nundergroundSystem.checkOut(10, "Paradise", 8); // Customer 10 "Leyton" -> "Paradise" in 8-3 = 5\nundergroundSystem.getAverageTime("Leyton", "Paradise"); // return 5.00000, (5) / 1 = 5\nundergroundSystem.checkIn(5, "Leyton", 10);\nundergroundSystem.checkOut(5, "Paradise", 16); // Customer 5 "Leyton" -> "Paradise" in 16-10 = 6\nundergroundSystem.getAverageTime("Leyton", "Paradise"); // return 5.50000, (5 + 6) / 2 = 5.5\nundergroundSystem.checkIn(2, "Leyton", 21);\nundergroundSystem.checkOut(2, "Paradise", 30); // Customer 2 "Leyton" -> "Paradise" in 30-21 = 9\nundergroundSystem.getAverageTime("Leyton", "Paradise"); // return 6.66667, (5 + 6 + 9) / 3 = 6.66667\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= id, t <= 10<sup>6</sup></code></li>\n\t<li><code>1 <= stationName.length, startStation.length, endStation.length <= 10</code></li>\n\t<li>All strings consist of uppercase and lowercase English letters and digits.</li>\n\t<li>There will be at most <code>2 * 10<sup>4</sup></code> calls <strong>in total</strong> to <code>checkIn</code>, <code>checkOut</code>, and <code>getAverageTime</code>.</li>\n\t<li>Answers within <code>10<sup>-5</sup></code> of the actual value will be accepted.</li>\n</ul>\n",
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"translatedTitle": "设计地铁系统",
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"translatedContent": "<p>地铁系统跟踪不同车站之间的乘客出行时间，并使用这一数据来计算从一站到另一站的平均时间。</p>\n\n<p>实现 <code>UndergroundSystem</code> 类：</p>\n\n<ul>\n\t<li><code>void checkIn(int id, string stationName, int t)</code>\n\n\t<ul>\n\t\t<li>通行卡 ID 等于 <code>id</code> 的乘客，在时间 <code>t</code> ，从 <code>stationName</code> 站进入</li>\n\t\t<li>乘客一次只能从一个站进入</li>\n\t</ul>\n\t</li>\n\t<li><code>void checkOut(int id, string stationName, int t)</code>\n\t<ul>\n\t\t<li>通行卡 ID 等于 <code>id</code> 的乘客，在时间 <code>t</code> ，从 <code>stationName</code> 站离开</li>\n\t</ul>\n\t</li>\n\t<li><code>double getAverageTime(string startStation, string endStation)</code>\n\t<ul>\n\t\t<li>返回从 <code>startStation</code> 站到 <code>endStation</code> 站的平均时间</li>\n\t\t<li>平均时间会根据截至目前所有从 <code>startStation</code> 站 <strong>直接</strong> 到达 <code>endStation</code> 站的行程进行计算，也就是从 <code>startStation</code> 站进入并从 <code>endStation</code> 离开的行程</li>\n\t\t<li>从 <code>startStation</code> 到 <code>endStation</code> 的行程时间与从 <code>endStation</code> 到 <code>startStation</code> 的行程时间可能不同</li>\n\t\t<li>在调用 <code>getAverageTime</code> 之前，至少有一名乘客从 <code>startStation</code> 站到达 <code>endStation</code> 站</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>你可以假设对 <code>checkIn</code> 和 <code>checkOut</code> 方法的所有调用都是符合逻辑的。如果一名乘客在时间 <code>t<sub>1</sub></code> 进站、时间 <code>t<sub>2</sub></code> 出站，那么 <code>t<sub>1</sub> < t<sub>2</sub></code> 。所有时间都按时间顺序发生。</p>\n \n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入</strong>\n[\"UndergroundSystem\",\"checkIn\",\"checkIn\",\"checkIn\",\"checkOut\",\"checkOut\",\"checkOut\",\"getAverageTime\",\"getAverageTime\",\"checkIn\",\"getAverageTime\",\"checkOut\",\"getAverageTime\"]\n[[],[45,\"Leyton\",3],[32,\"Paradise\",8],[27,\"Leyton\",10],[45,\"Waterloo\",15],[27,\"Waterloo\",20],[32,\"Cambridge\",22],[\"Paradise\",\"Cambridge\"],[\"Leyton\",\"Waterloo\"],[10,\"Leyton\",24],[\"Leyton\",\"Waterloo\"],[10,\"Waterloo\",38],[\"Leyton\",\"Waterloo\"]]\n\n<strong>输出</strong>\n[null,null,null,null,null,null,null,14.00000,11.00000,null,11.00000,null,12.00000]\n\n<strong>解释</strong>\nUndergroundSystem undergroundSystem = new UndergroundSystem();\nundergroundSystem.checkIn(45, \"Leyton\", 3);\nundergroundSystem.checkIn(32, \"Paradise\", 8);\nundergroundSystem.checkIn(27, \"Leyton\", 10);\nundergroundSystem.checkOut(45, \"Waterloo\", 15); // 乘客 45 \"Leyton\" -> \"Waterloo\" ，用时 15-3 = 12\nundergroundSystem.checkOut(27, \"Waterloo\", 20); // 乘客 27 \"Leyton\" -> \"Waterloo\" ，用时 20-10 = 10\nundergroundSystem.checkOut(32, \"Cambridge\", 22); // 乘客 32 \"Paradise\" -> \"Cambridge\" ，用时 22-8 = 14\nundergroundSystem.getAverageTime(\"Paradise\", \"Cambridge\"); // 返回 14.00000 。只有一个 \"Paradise\" -> \"Cambridge\" 的行程，(14) / 1 = 14\nundergroundSystem.getAverageTime(\"Leyton\", \"Waterloo\"); // 返回 11.00000 。有两个 \"Leyton\" -> \"Waterloo\" 的行程，(10 + 12) / 2 = 11\nundergroundSystem.checkIn(10, \"Leyton\", 24);\nundergroundSystem.getAverageTime(\"Leyton\", \"Waterloo\"); // 返回 11.00000\nundergroundSystem.checkOut(10, \"Waterloo\", 38); // 乘客 10 \"Leyton\" -> \"Waterloo\" ，用时 38-24 = 14\nundergroundSystem.getAverageTime(\"Leyton\", \"Waterloo\"); // 返回 12.00000 。有三个 \"Leyton\" -> \"Waterloo\" 的行程，(10 + 12 + 14) / 3 = 12\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入</strong>\n[\"UndergroundSystem\",\"checkIn\",\"checkOut\",\"getAverageTime\",\"checkIn\",\"checkOut\",\"getAverageTime\",\"checkIn\",\"checkOut\",\"getAverageTime\"]\n[[],[10,\"Leyton\",3],[10,\"Paradise\",8],[\"Leyton\",\"Paradise\"],[5,\"Leyton\",10],[5,\"Paradise\",16],[\"Leyton\",\"Paradise\"],[2,\"Leyton\",21],[2,\"Paradise\",30],[\"Leyton\",\"Paradise\"]]\n\n<strong>输出</strong>\n[null,null,null,5.00000,null,null,5.50000,null,null,6.66667]\n\n<strong>解释</strong>\nUndergroundSystem undergroundSystem = new UndergroundSystem();\nundergroundSystem.checkIn(10, \"Leyton\", 3);\nundergroundSystem.checkOut(10, \"Paradise\", 8); // 乘客 10 \"Leyton\" -> \"Paradise\" ，用时 8-3 = 5\nundergroundSystem.getAverageTime(\"Leyton\", \"Paradise\"); // 返回 5.00000 ，(5) / 1 = 5\nundergroundSystem.checkIn(5, \"Leyton\", 10);\nundergroundSystem.checkOut(5, \"Paradise\", 16); // 乘客 5 \"Leyton\" -> \"Paradise\" ，用时 16-10 = 6\nundergroundSystem.getAverageTime(\"Leyton\", \"Paradise\"); // 返回 5.50000 ，(5 + 6) / 2 = 5.5\nundergroundSystem.checkIn(2, \"Leyton\", 21);\nundergroundSystem.checkOut(2, \"Paradise\", 30); // 乘客 2 \"Leyton\" -> \"Paradise\" ，用时 30-21 = 9\nundergroundSystem.getAverageTime(\"Leyton\", \"Paradise\"); // 返回 6.66667 ，(5 + 6 + 9) / 3 = 6.66667\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= id, t <= 10<sup>6</sup></code></li>\n\t<li><code>1 <= stationName.length, startStation.length, endStation.length <= 10</code> 次</li>\n\t<li>所有字符串由大小写英文字母与数字组成</li>\n\t<li>总共最多调用 <code>checkIn</code>、<code>checkOut</code> 和 <code>getAverageTime</code> 方法 <code>2 * 10<sup>4 </sup></code></li>\n\t<li>与标准答案误差在 <code>10<sup>-5</sup></code> 以内的结果都被视为正确结果</li>\n</ul>\n",
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"code": "class UndergroundSystem {\npublic:\n UndergroundSystem() {\n\n }\n \n void checkIn(int id, string stationName, int t) {\n\n }\n \n void checkOut(int id, string stationName, int t) {\n\n }\n \n double getAverageTime(string startStation, string endStation) {\n\n }\n};\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * UndergroundSystem* obj = new UndergroundSystem();\n * obj->checkIn(id,stationName,t);\n * obj->checkOut(id,stationName,t);\n * double param_3 = obj->getAverageTime(startStation,endStation);\n */",
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"code": "class UndergroundSystem {\n\n public UndergroundSystem() {\n\n }\n \n public void checkIn(int id, String stationName, int t) {\n\n }\n \n public void checkOut(int id, String stationName, int t) {\n\n }\n \n public double getAverageTime(String startStation, String endStation) {\n\n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * UndergroundSystem obj = new UndergroundSystem();\n * obj.checkIn(id,stationName,t);\n * obj.checkOut(id,stationName,t);\n * double param_3 = obj.getAverageTime(startStation,endStation);\n */",
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"code": "class UndergroundSystem(object):\n\n def __init__(self):\n\n\n def checkIn(self, id, stationName, t):\n \"\"\"\n :type id: int\n :type stationName: str\n :type t: int\n :rtype: None\n \"\"\"\n\n\n def checkOut(self, id, stationName, t):\n \"\"\"\n :type id: int\n :type stationName: str\n :type t: int\n :rtype: None\n \"\"\"\n\n\n def getAverageTime(self, startStation, endStation):\n \"\"\"\n :type startStation: str\n :type endStation: str\n :rtype: float\n \"\"\"\n\n\n\n# Your UndergroundSystem object will be instantiated and called as such:\n# obj = UndergroundSystem()\n# obj.checkIn(id,stationName,t)\n# obj.checkOut(id,stationName,t)\n# param_3 = obj.getAverageTime(startStation,endStation)",
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"code": "class UndergroundSystem:\n\n def __init__(self):\n\n\n def checkIn(self, id: int, stationName: str, t: int) -> None:\n\n\n def checkOut(self, id: int, stationName: str, t: int) -> None:\n\n\n def getAverageTime(self, startStation: str, endStation: str) -> float:\n\n\n\n# Your UndergroundSystem object will be instantiated and called as such:\n# obj = UndergroundSystem()\n# obj.checkIn(id,stationName,t)\n# obj.checkOut(id,stationName,t)\n# param_3 = obj.getAverageTime(startStation,endStation)",
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"code": "\n\n\ntypedef struct {\n \n} UndergroundSystem;\n\n\nUndergroundSystem* undergroundSystemCreate() {\n \n}\n\nvoid undergroundSystemCheckIn(UndergroundSystem* obj, int id, char* stationName, int t) {\n \n}\n\nvoid undergroundSystemCheckOut(UndergroundSystem* obj, int id, char* stationName, int t) {\n \n}\n\ndouble undergroundSystemGetAverageTime(UndergroundSystem* obj, char* startStation, char* endStation) {\n \n}\n\nvoid undergroundSystemFree(UndergroundSystem* obj) {\n \n}\n\n/**\n * Your UndergroundSystem struct will be instantiated and called as such:\n * UndergroundSystem* obj = undergroundSystemCreate();\n * undergroundSystemCheckIn(obj, id, stationName, t);\n \n * undergroundSystemCheckOut(obj, id, stationName, t);\n \n * double param_3 = undergroundSystemGetAverageTime(obj, startStation, endStation);\n \n * undergroundSystemFree(obj);\n*/",
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"code": "public class UndergroundSystem {\n\n public UndergroundSystem() {\n\n }\n \n public void CheckIn(int id, string stationName, int t) {\n\n }\n \n public void CheckOut(int id, string stationName, int t) {\n\n }\n \n public double GetAverageTime(string startStation, string endStation) {\n\n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * UndergroundSystem obj = new UndergroundSystem();\n * obj.CheckIn(id,stationName,t);\n * obj.CheckOut(id,stationName,t);\n * double param_3 = obj.GetAverageTime(startStation,endStation);\n */",
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"code": "\nvar UndergroundSystem = function() {\n\n};\n\n/** \n * @param {number} id \n * @param {string} stationName \n * @param {number} t\n * @return {void}\n */\nUndergroundSystem.prototype.checkIn = function(id, stationName, t) {\n\n};\n\n/** \n * @param {number} id \n * @param {string} stationName \n * @param {number} t\n * @return {void}\n */\nUndergroundSystem.prototype.checkOut = function(id, stationName, t) {\n\n};\n\n/** \n * @param {string} startStation \n * @param {string} endStation\n * @return {number}\n */\nUndergroundSystem.prototype.getAverageTime = function(startStation, endStation) {\n\n};\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * var obj = new UndergroundSystem()\n * obj.checkIn(id,stationName,t)\n * obj.checkOut(id,stationName,t)\n * var param_3 = obj.getAverageTime(startStation,endStation)\n */",
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"code": "class UndergroundSystem {\n constructor() {\n \n }\n\n checkIn(id: number, stationName: string, t: number): void {\n \n }\n\n checkOut(id: number, stationName: string, t: number): void {\n \n }\n\n getAverageTime(startStation: string, endStation: string): number {\n \n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * var obj = new UndergroundSystem()\n * obj.checkIn(id,stationName,t)\n * obj.checkOut(id,stationName,t)\n * var param_3 = obj.getAverageTime(startStation,endStation)\n */",
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"code": "class UndergroundSystem {\n /**\n */\n function __construct() {\n\n }\n\n /**\n * @param Integer $id\n * @param String $stationName\n * @param Integer $t\n * @return NULL\n */\n function checkIn($id, $stationName, $t) {\n\n }\n\n /**\n * @param Integer $id\n * @param String $stationName\n * @param Integer $t\n * @return NULL\n */\n function checkOut($id, $stationName, $t) {\n\n }\n\n /**\n * @param String $startStation\n * @param String $endStation\n * @return Float\n */\n function getAverageTime($startStation, $endStation) {\n\n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * $obj = UndergroundSystem();\n * $obj->checkIn($id, $stationName, $t);\n * $obj->checkOut($id, $stationName, $t);\n * $ret_3 = $obj->getAverageTime($startStation, $endStation);\n */",
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"code": "\nclass UndergroundSystem {\n\n init() {\n\n }\n \n func checkIn(_ id: Int, _ stationName: String, _ t: Int) {\n\n }\n \n func checkOut(_ id: Int, _ stationName: String, _ t: Int) {\n\n }\n \n func getAverageTime(_ startStation: String, _ endStation: String) -> Double {\n\n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * let obj = UndergroundSystem()\n * obj.checkIn(id, stationName, t)\n * obj.checkOut(id, stationName, t)\n * let ret_3: Double = obj.getAverageTime(startStation, endStation)\n */",
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"code": "class UndergroundSystem() {\n\n fun checkIn(id: Int, stationName: String, t: Int) {\n\n }\n\n fun checkOut(id: Int, stationName: String, t: Int) {\n\n }\n\n fun getAverageTime(startStation: String, endStation: String): Double {\n\n }\n\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * var obj = UndergroundSystem()\n * obj.checkIn(id,stationName,t)\n * obj.checkOut(id,stationName,t)\n * var param_3 = obj.getAverageTime(startStation,endStation)\n */",
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"code": "class UndergroundSystem {\n\n UndergroundSystem() {\n \n }\n \n void checkIn(int id, String stationName, int t) {\n \n }\n \n void checkOut(int id, String stationName, int t) {\n \n }\n \n double getAverageTime(String startStation, String endStation) {\n \n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * UndergroundSystem obj = UndergroundSystem();\n * obj.checkIn(id,stationName,t);\n * obj.checkOut(id,stationName,t);\n * double param3 = obj.getAverageTime(startStation,endStation);\n */",
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"lang": "Go",
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"langSlug": "golang",
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||
"code": "type UndergroundSystem struct {\n\n}\n\n\nfunc Constructor() UndergroundSystem {\n\n}\n\n\nfunc (this *UndergroundSystem) CheckIn(id int, stationName string, t int) {\n\n}\n\n\nfunc (this *UndergroundSystem) CheckOut(id int, stationName string, t int) {\n\n}\n\n\nfunc (this *UndergroundSystem) GetAverageTime(startStation string, endStation string) float64 {\n\n}\n\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * obj := Constructor();\n * obj.CheckIn(id,stationName,t);\n * obj.CheckOut(id,stationName,t);\n * param_3 := obj.GetAverageTime(startStation,endStation);\n */",
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"lang": "Ruby",
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"langSlug": "ruby",
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||
"code": "class UndergroundSystem\n def initialize()\n\n end\n\n\n=begin\n :type id: Integer\n :type station_name: String\n :type t: Integer\n :rtype: Void\n=end\n def check_in(id, station_name, t)\n\n end\n\n\n=begin\n :type id: Integer\n :type station_name: String\n :type t: Integer\n :rtype: Void\n=end\n def check_out(id, station_name, t)\n\n end\n\n\n=begin\n :type start_station: String\n :type end_station: String\n :rtype: Float\n=end\n def get_average_time(start_station, end_station)\n\n end\n\n\nend\n\n# Your UndergroundSystem object will be instantiated and called as such:\n# obj = UndergroundSystem.new()\n# obj.check_in(id, station_name, t)\n# obj.check_out(id, station_name, t)\n# param_3 = obj.get_average_time(start_station, end_station)",
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||
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||
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||
{
|
||
"lang": "Scala",
|
||
"langSlug": "scala",
|
||
"code": "class UndergroundSystem() {\n\n def checkIn(id: Int, stationName: String, t: Int) {\n\n }\n\n def checkOut(id: Int, stationName: String, t: Int) {\n\n }\n\n def getAverageTime(startStation: String, endStation: String): Double = {\n\n }\n\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * var obj = new UndergroundSystem()\n * obj.checkIn(id,stationName,t)\n * obj.checkOut(id,stationName,t)\n * var param_3 = obj.getAverageTime(startStation,endStation)\n */",
|
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||
},
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{
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||
"lang": "Rust",
|
||
"langSlug": "rust",
|
||
"code": "struct UndergroundSystem {\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 UndergroundSystem {\n\n fn new() -> Self {\n\n }\n \n fn check_in(&self, id: i32, station_name: String, t: i32) {\n\n }\n \n fn check_out(&self, id: i32, station_name: String, t: i32) {\n\n }\n \n fn get_average_time(&self, start_station: String, end_station: String) -> f64 {\n\n }\n}\n\n/**\n * Your UndergroundSystem object will be instantiated and called as such:\n * let obj = UndergroundSystem::new();\n * obj.check_in(id, stationName, t);\n * obj.check_out(id, stationName, t);\n * let ret_3: f64 = obj.get_average_time(startStation, endStation);\n */",
|
||
"__typename": "CodeSnippetNode"
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||
},
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||
{
|
||
"lang": "Racket",
|
||
"langSlug": "racket",
|
||
"code": "(define underground-system%\n (class object%\n (super-new)\n \n (init-field)\n \n ; check-in : exact-integer? string? exact-integer? -> void?\n (define/public (check-in id station-name t)\n )\n ; check-out : exact-integer? string? exact-integer? -> void?\n (define/public (check-out id station-name t)\n )\n ; get-average-time : string? string? -> flonum?\n (define/public (get-average-time start-station end-station)\n )))\n\n;; Your underground-system% object will be instantiated and called as such:\n;; (define obj (new underground-system%))\n;; (send obj check-in id station-name t)\n;; (send obj check-out id station-name t)\n;; (define param_3 (send obj get-average-time start-station end-station))",
|
||
"__typename": "CodeSnippetNode"
|
||
},
|
||
{
|
||
"lang": "Erlang",
|
||
"langSlug": "erlang",
|
||
"code": "-spec underground_system_init_() -> any().\nunderground_system_init_() ->\n .\n\n-spec underground_system_check_in(Id :: integer(), StationName :: unicode:unicode_binary(), T :: integer()) -> any().\nunderground_system_check_in(Id, StationName, T) ->\n .\n\n-spec underground_system_check_out(Id :: integer(), StationName :: unicode:unicode_binary(), T :: integer()) -> any().\nunderground_system_check_out(Id, StationName, T) ->\n .\n\n-spec underground_system_get_average_time(StartStation :: unicode:unicode_binary(), EndStation :: unicode:unicode_binary()) -> float().\nunderground_system_get_average_time(StartStation, EndStation) ->\n .\n\n\n%% Your functions will be called as such:\n%% underground_system_init_(),\n%% underground_system_check_in(Id, StationName, T),\n%% underground_system_check_out(Id, StationName, T),\n%% Param_3 = underground_system_get_average_time(StartStation, EndStation),\n\n%% underground_system_init_ will be called before every test case, in which you can do some necessary initializations.",
|
||
"__typename": "CodeSnippetNode"
|
||
},
|
||
{
|
||
"lang": "Elixir",
|
||
"langSlug": "elixir",
|
||
"code": "defmodule UndergroundSystem do\n @spec init_() :: any\n def init_() do\n \n end\n\n @spec check_in(id :: integer, station_name :: String.t, t :: integer) :: any\n def check_in(id, station_name, t) do\n \n end\n\n @spec check_out(id :: integer, station_name :: String.t, t :: integer) :: any\n def check_out(id, station_name, t) do\n \n end\n\n @spec get_average_time(start_station :: String.t, end_station :: String.t) :: float\n def get_average_time(start_station, end_station) do\n \n end\nend\n\n# Your functions will be called as such:\n# UndergroundSystem.init_()\n# UndergroundSystem.check_in(id, station_name, t)\n# UndergroundSystem.check_out(id, station_name, t)\n# param_3 = UndergroundSystem.get_average_time(start_station, end_station)\n\n# UndergroundSystem.init_ will be called before every test case, in which you can do some necessary initializations.",
|
||
"__typename": "CodeSnippetNode"
|
||
}
|
||
],
|
||
"stats": "{\"totalAccepted\": \"22.6K\", \"totalSubmission\": \"53.7K\", \"totalAcceptedRaw\": 22640, \"totalSubmissionRaw\": 53654, \"acRate\": \"42.2%\"}",
|
||
"hints": [
|
||
"Use two hash tables. The first to save the check-in time for a customer and the second to update the total time between two stations."
|
||
],
|
||
"solution": null,
|
||
"status": null,
|
||
"sampleTestCase": "[\"UndergroundSystem\",\"checkIn\",\"checkIn\",\"checkIn\",\"checkOut\",\"checkOut\",\"checkOut\",\"getAverageTime\",\"getAverageTime\",\"checkIn\",\"getAverageTime\",\"checkOut\",\"getAverageTime\"]\n[[],[45,\"Leyton\",3],[32,\"Paradise\",8],[27,\"Leyton\",10],[45,\"Waterloo\",15],[27,\"Waterloo\",20],[32,\"Cambridge\",22],[\"Paradise\",\"Cambridge\"],[\"Leyton\",\"Waterloo\"],[10,\"Leyton\",24],[\"Leyton\",\"Waterloo\"],[10,\"Waterloo\",38],[\"Leyton\",\"Waterloo\"]]",
|
||
"metaData": "{\n \"classname\": \"UndergroundSystem\",\n \"constructor\": {\n \"params\": []\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"id\"\n },\n {\n \"type\": \"string\",\n \"name\": \"stationName\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"t\"\n }\n ],\n \"name\": \"checkIn\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"id\"\n },\n {\n \"type\": \"string\",\n \"name\": \"stationName\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"t\"\n }\n ],\n \"name\": \"checkOut\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"startStation\"\n },\n {\n \"type\": \"string\",\n \"name\": \"endStation\"\n }\n ],\n \"name\": \"getAverageTime\",\n \"return\": {\n \"type\": \"double\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
|
||
"judgerAvailable": true,
|
||
"judgeType": "large",
|
||
"mysqlSchemas": [],
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||
"enableRunCode": true,
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||
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