{ "data": { "question": { "questionId": "1905", "questionFrontendId": "1797", "categoryTitle": "Algorithms", "boundTopicId": 665389, "title": "Design Authentication Manager", "titleSlug": "design-authentication-manager", "content": "

There is an authentication system that works with authentication tokens. For each session, the user will receive a new authentication token that will expire timeToLive seconds after the currentTime. If the token is renewed, the expiry time will be extended to expire timeToLive seconds after the (potentially different) currentTime.

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Implement the AuthenticationManager class:

\n\n\n\n

Note that if a token expires at time t, and another action happens on time t (renew or countUnexpiredTokens), the expiration takes place before the other actions.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput\n["AuthenticationManager", "renew", "generate", "countUnexpiredTokens", "generate", "renew", "renew", "countUnexpiredTokens"]\n[[5], ["aaa", 1], ["aaa", 2], [6], ["bbb", 7], ["aaa", 8], ["bbb", 10], [15]]\nOutput\n[null, null, null, 1, null, null, null, 0]\n\nExplanation\nAuthenticationManager authenticationManager = new AuthenticationManager(5); // Constructs the AuthenticationManager with timeToLive = 5 seconds.\nauthenticationManager.renew("aaa", 1); // No token exists with tokenId "aaa" at time 1, so nothing happens.\nauthenticationManager.generate("aaa", 2); // Generates a new token with tokenId "aaa" at time 2.\nauthenticationManager.countUnexpiredTokens(6); // The token with tokenId "aaa" is the only unexpired one at time 6, so return 1.\nauthenticationManager.generate("bbb", 7); // Generates a new token with tokenId "bbb" at time 7.\nauthenticationManager.renew("aaa", 8); // The token with tokenId "aaa" expired at time 7, and 8 >= 7, so at time 8 the renew request is ignored, and nothing happens.\nauthenticationManager.renew("bbb", 10); // The token with tokenId "bbb" is unexpired at time 10, so the renew request is fulfilled and now the token will expire at time 15.\nauthenticationManager.countUnexpiredTokens(15); // The token with tokenId "bbb" expires at time 15, and the token with tokenId "aaa" expired at time 7, so currently no token is unexpired, so return 0.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "设计一个验证系统", "translatedContent": "

你需要设计一个包含验证码的验证系统。每一次验证中，用户会收到一个新的验证码，这个验证码在 currentTime 时刻之后 timeToLive 秒过期。如果验证码被更新了，那么它会在 currentTime （可能与之前的 currentTime 不同）时刻延长 timeToLive 秒。

\n\n

请你实现 AuthenticationManager 类：

\n\n\n\n

如果一个验证码在时刻 t 过期，且另一个操作恰好在时刻 t 发生（renew 或者 countUnexpiredTokens 操作），过期事件 优先于 其他操作。

\n\n

 

\n\n

示例 1：

\n\"\"\n
\n输入：\n[\"AuthenticationManager\", \"renew\", \"generate\", \"countUnexpiredTokens\", \"generate\", \"renew\", \"renew\", \"countUnexpiredTokens\"]\n[[5], [\"aaa\", 1], [\"aaa\", 2], [6], [\"bbb\", 7], [\"aaa\", 8], [\"bbb\", 10], [15]]\n输出：\n[null, null, null, 1, null, null, null, 0]\n\n解释：\nAuthenticationManager authenticationManager = new AuthenticationManager(5); // 构造 AuthenticationManager ，设置 timeToLive = 5 秒。\nauthenticationManager.renew(\"aaa\", 1); // 时刻 1 时，没有验证码的 tokenId 为 \"aaa\" ，没有验证码被更新。\nauthenticationManager.generate(\"aaa\", 2); // 时刻 2 时，生成一个 tokenId 为 \"aaa\" 的新验证码。\nauthenticationManager.countUnexpiredTokens(6); // 时刻 6 时，只有 tokenId 为 \"aaa\" 的验证码未过期，所以返回 1 。\nauthenticationManager.generate(\"bbb\", 7); // 时刻 7 时，生成一个 tokenId 为 \"bbb\" 的新验证码。\nauthenticationManager.renew(\"aaa\", 8); // tokenId 为 \"aaa\" 的验证码在时刻 7 过期，且 8 >= 7 ，所以时刻 8 的renew 操作被忽略，没有验证码被更新。\nauthenticationManager.renew(\"bbb\", 10); // tokenId 为 \"bbb\" 的验证码在时刻 10 没有过期，所以 renew 操作会执行，该 token 将在时刻 15 过期。\nauthenticationManager.countUnexpiredTokens(15); // tokenId 为 \"bbb\" 的验证码在时刻 15 过期，tokenId 为 \"aaa\" 的验证码在时刻 7 过期，所有验证码均已过期，所以返回 0 。\n
\n\n

 

\n\n

提示：

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"langSlug": "cpp", "code": "class AuthenticationManager {\npublic:\n AuthenticationManager(int timeToLive) {\n\n }\n \n void generate(string tokenId, int currentTime) {\n\n }\n \n void renew(string tokenId, int currentTime) {\n\n }\n \n int countUnexpiredTokens(int currentTime) {\n\n }\n};\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * AuthenticationManager* obj = new AuthenticationManager(timeToLive);\n * obj->generate(tokenId,currentTime);\n * obj->renew(tokenId,currentTime);\n * int param_3 = obj->countUnexpiredTokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class AuthenticationManager {\n\n public AuthenticationManager(int timeToLive) {\n\n }\n \n public void generate(String tokenId, int currentTime) {\n\n }\n \n public void renew(String tokenId, int currentTime) {\n\n }\n \n public int countUnexpiredTokens(int currentTime) {\n\n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * AuthenticationManager obj = new AuthenticationManager(timeToLive);\n * obj.generate(tokenId,currentTime);\n * obj.renew(tokenId,currentTime);\n * int param_3 = obj.countUnexpiredTokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class AuthenticationManager(object):\n\n def __init__(self, timeToLive):\n \"\"\"\n :type timeToLive: int\n \"\"\"\n\n\n def generate(self, tokenId, currentTime):\n \"\"\"\n :type tokenId: str\n :type currentTime: int\n :rtype: None\n \"\"\"\n\n\n def renew(self, tokenId, currentTime):\n \"\"\"\n :type tokenId: str\n :type currentTime: int\n :rtype: None\n \"\"\"\n\n\n def countUnexpiredTokens(self, currentTime):\n \"\"\"\n :type currentTime: int\n :rtype: int\n \"\"\"\n\n\n\n# Your AuthenticationManager object will be instantiated and called as such:\n# obj = AuthenticationManager(timeToLive)\n# obj.generate(tokenId,currentTime)\n# obj.renew(tokenId,currentTime)\n# param_3 = obj.countUnexpiredTokens(currentTime)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class AuthenticationManager:\n\n def __init__(self, timeToLive: int):\n\n\n def generate(self, tokenId: str, currentTime: int) -> None:\n\n\n def renew(self, tokenId: str, currentTime: int) -> None:\n\n\n def countUnexpiredTokens(self, currentTime: int) -> int:\n\n\n\n# Your AuthenticationManager object will be instantiated and called as such:\n# obj = AuthenticationManager(timeToLive)\n# obj.generate(tokenId,currentTime)\n# obj.renew(tokenId,currentTime)\n# param_3 = obj.countUnexpiredTokens(currentTime)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} AuthenticationManager;\n\n\nAuthenticationManager* authenticationManagerCreate(int timeToLive) {\n \n}\n\nvoid authenticationManagerGenerate(AuthenticationManager* obj, char* tokenId, int currentTime) {\n \n}\n\nvoid authenticationManagerRenew(AuthenticationManager* obj, char* tokenId, int currentTime) {\n \n}\n\nint authenticationManagerCountUnexpiredTokens(AuthenticationManager* obj, int currentTime) {\n \n}\n\nvoid authenticationManagerFree(AuthenticationManager* obj) {\n \n}\n\n/**\n * Your AuthenticationManager struct will be instantiated and called as such:\n * AuthenticationManager* obj = authenticationManagerCreate(timeToLive);\n * authenticationManagerGenerate(obj, tokenId, currentTime);\n \n * authenticationManagerRenew(obj, tokenId, currentTime);\n \n * int param_3 = authenticationManagerCountUnexpiredTokens(obj, currentTime);\n \n * authenticationManagerFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class AuthenticationManager {\n\n public AuthenticationManager(int timeToLive) {\n\n }\n \n public void Generate(string tokenId, int currentTime) {\n\n }\n \n public void Renew(string tokenId, int currentTime) {\n\n }\n \n public int CountUnexpiredTokens(int currentTime) {\n\n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * AuthenticationManager obj = new AuthenticationManager(timeToLive);\n * obj.Generate(tokenId,currentTime);\n * obj.Renew(tokenId,currentTime);\n * int param_3 = obj.CountUnexpiredTokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} timeToLive\n */\nvar AuthenticationManager = function(timeToLive) {\n\n};\n\n/** \n * @param {string} tokenId \n * @param {number} currentTime\n * @return {void}\n */\nAuthenticationManager.prototype.generate = function(tokenId, currentTime) {\n\n};\n\n/** \n * @param {string} tokenId \n * @param {number} currentTime\n * @return {void}\n */\nAuthenticationManager.prototype.renew = function(tokenId, currentTime) {\n\n};\n\n/** \n * @param {number} currentTime\n * @return {number}\n */\nAuthenticationManager.prototype.countUnexpiredTokens = function(currentTime) {\n\n};\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * var obj = new AuthenticationManager(timeToLive)\n * obj.generate(tokenId,currentTime)\n * obj.renew(tokenId,currentTime)\n * var param_3 = obj.countUnexpiredTokens(currentTime)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class AuthenticationManager {\n constructor(timeToLive: number) {\n \n }\n\n generate(tokenId: string, currentTime: number): void {\n \n }\n\n renew(tokenId: string, currentTime: number): void {\n \n }\n\n countUnexpiredTokens(currentTime: number): number {\n \n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * var obj = new AuthenticationManager(timeToLive)\n * obj.generate(tokenId,currentTime)\n * obj.renew(tokenId,currentTime)\n * var param_3 = obj.countUnexpiredTokens(currentTime)\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class AuthenticationManager {\n /**\n * @param Integer $timeToLive\n */\n function __construct($timeToLive) {\n\n }\n\n /**\n * @param String $tokenId\n * @param Integer $currentTime\n * @return NULL\n */\n function generate($tokenId, $currentTime) {\n\n }\n\n /**\n * @param String $tokenId\n * @param Integer $currentTime\n * @return NULL\n */\n function renew($tokenId, $currentTime) {\n\n }\n\n /**\n * @param Integer $currentTime\n * @return Integer\n */\n function countUnexpiredTokens($currentTime) {\n\n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * $obj = AuthenticationManager($timeToLive);\n * $obj->generate($tokenId, $currentTime);\n * $obj->renew($tokenId, $currentTime);\n * $ret_3 = $obj->countUnexpiredTokens($currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass AuthenticationManager {\n\n init(_ timeToLive: Int) {\n\n }\n \n func generate(_ tokenId: String, _ currentTime: Int) {\n\n }\n \n func renew(_ tokenId: String, _ currentTime: Int) {\n\n }\n \n func countUnexpiredTokens(_ currentTime: Int) -> Int {\n\n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * let obj = AuthenticationManager(timeToLive)\n * obj.generate(tokenId, currentTime)\n * obj.renew(tokenId, currentTime)\n * let ret_3: Int = obj.countUnexpiredTokens(currentTime)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class AuthenticationManager(timeToLive: Int) {\n\n fun generate(tokenId: String, currentTime: Int) {\n\n }\n\n fun renew(tokenId: String, currentTime: Int) {\n\n }\n\n fun countUnexpiredTokens(currentTime: Int): Int {\n\n }\n\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * var obj = AuthenticationManager(timeToLive)\n * obj.generate(tokenId,currentTime)\n * obj.renew(tokenId,currentTime)\n * var param_3 = obj.countUnexpiredTokens(currentTime)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class AuthenticationManager {\n\n AuthenticationManager(int timeToLive) {\n \n }\n \n void generate(String tokenId, int currentTime) {\n \n }\n \n void renew(String tokenId, int currentTime) {\n \n }\n \n int countUnexpiredTokens(int currentTime) {\n \n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * AuthenticationManager obj = AuthenticationManager(timeToLive);\n * obj.generate(tokenId,currentTime);\n * obj.renew(tokenId,currentTime);\n * int param3 = obj.countUnexpiredTokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type AuthenticationManager struct {\n\n}\n\n\nfunc Constructor(timeToLive int) AuthenticationManager {\n\n}\n\n\nfunc (this *AuthenticationManager) Generate(tokenId string, currentTime int) {\n\n}\n\n\nfunc (this *AuthenticationManager) Renew(tokenId string, currentTime int) {\n\n}\n\n\nfunc (this *AuthenticationManager) CountUnexpiredTokens(currentTime int) int {\n\n}\n\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * obj := Constructor(timeToLive);\n * obj.Generate(tokenId,currentTime);\n * obj.Renew(tokenId,currentTime);\n * param_3 := obj.CountUnexpiredTokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class AuthenticationManager\n\n=begin\n :type time_to_live: Integer\n=end\n def initialize(time_to_live)\n\n end\n\n\n=begin\n :type token_id: String\n :type current_time: Integer\n :rtype: Void\n=end\n def generate(token_id, current_time)\n\n end\n\n\n=begin\n :type token_id: String\n :type current_time: Integer\n :rtype: Void\n=end\n def renew(token_id, current_time)\n\n end\n\n\n=begin\n :type current_time: Integer\n :rtype: Integer\n=end\n def count_unexpired_tokens(current_time)\n\n end\n\n\nend\n\n# Your AuthenticationManager object will be instantiated and called as such:\n# obj = AuthenticationManager.new(time_to_live)\n# obj.generate(token_id, current_time)\n# obj.renew(token_id, current_time)\n# param_3 = obj.count_unexpired_tokens(current_time)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class AuthenticationManager(_timeToLive: Int) {\n\n def generate(tokenId: String, currentTime: Int) {\n \n }\n\n def renew(tokenId: String, currentTime: Int) {\n \n }\n\n def countUnexpiredTokens(currentTime: Int): Int = {\n \n }\n\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * var obj = new AuthenticationManager(timeToLive)\n * obj.generate(tokenId,currentTime)\n * obj.renew(tokenId,currentTime)\n * var param_3 = obj.countUnexpiredTokens(currentTime)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct AuthenticationManager {\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 AuthenticationManager {\n\n fn new(timeToLive: i32) -> Self {\n\n }\n \n fn generate(&self, token_id: String, current_time: i32) {\n\n }\n \n fn renew(&self, token_id: String, current_time: i32) {\n\n }\n \n fn count_unexpired_tokens(&self, current_time: i32) -> i32 {\n\n }\n}\n\n/**\n * Your AuthenticationManager object will be instantiated and called as such:\n * let obj = AuthenticationManager::new(timeToLive);\n * obj.generate(tokenId, currentTime);\n * obj.renew(tokenId, currentTime);\n * let ret_3: i32 = obj.count_unexpired_tokens(currentTime);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define authentication-manager%\n (class object%\n (super-new)\n \n ; time-to-live : exact-integer?\n (init-field\n time-to-live)\n \n ; generate : string? exact-integer? -> void?\n (define/public (generate token-id current-time)\n )\n ; renew : string? exact-integer? -> void?\n (define/public (renew token-id current-time)\n )\n ; count-unexpired-tokens : exact-integer? -> exact-integer?\n (define/public (count-unexpired-tokens current-time)\n )))\n\n;; Your authentication-manager% object will be instantiated and called as such:\n;; (define obj (new authentication-manager% [time-to-live time-to-live]))\n;; (send obj generate token-id current-time)\n;; (send obj renew token-id current-time)\n;; (define param_3 (send obj count-unexpired-tokens current-time))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec authentication_manager_init_(TimeToLive :: integer()) -> any().\nauthentication_manager_init_(TimeToLive) ->\n .\n\n-spec authentication_manager_generate(TokenId :: unicode:unicode_binary(), CurrentTime :: integer()) -> any().\nauthentication_manager_generate(TokenId, CurrentTime) ->\n .\n\n-spec authentication_manager_renew(TokenId :: unicode:unicode_binary(), CurrentTime :: integer()) -> any().\nauthentication_manager_renew(TokenId, CurrentTime) ->\n .\n\n-spec authentication_manager_count_unexpired_tokens(CurrentTime :: integer()) -> integer().\nauthentication_manager_count_unexpired_tokens(CurrentTime) ->\n .\n\n\n%% Your functions will be called as such:\n%% authentication_manager_init_(TimeToLive),\n%% authentication_manager_generate(TokenId, CurrentTime),\n%% authentication_manager_renew(TokenId, CurrentTime),\n%% Param_3 = authentication_manager_count_unexpired_tokens(CurrentTime),\n\n%% authentication_manager_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule AuthenticationManager do\n @spec init_(time_to_live :: integer) :: any\n def init_(time_to_live) do\n \n end\n\n @spec generate(token_id :: String.t, current_time :: integer) :: any\n def generate(token_id, current_time) do\n \n end\n\n @spec renew(token_id :: String.t, current_time :: integer) :: any\n def renew(token_id, current_time) do\n \n end\n\n @spec count_unexpired_tokens(current_time :: integer) :: integer\n def count_unexpired_tokens(current_time) do\n \n end\nend\n\n# Your functions will be called as such:\n# AuthenticationManager.init_(time_to_live)\n# AuthenticationManager.generate(token_id, current_time)\n# AuthenticationManager.renew(token_id, current_time)\n# param_3 = AuthenticationManager.count_unexpired_tokens(current_time)\n\n# AuthenticationManager.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"33.1K\", \"totalSubmission\": \"51.2K\", \"totalAcceptedRaw\": 33125, \"totalSubmissionRaw\": 51209, \"acRate\": \"64.7%\"}", "hints": [ "Using a map, track the expiry times of the tokens.", "When generating a new token, add it to the map with its expiry time.", "When renewing a token, check if it's on the map and has not expired yet. If so, update its expiry time.", "To count unexpired tokens, iterate on the map and check for each token if it's not expired yet." ], "solution": null, "status": null, "sampleTestCase": "[\"AuthenticationManager\",\"renew\",\"generate\",\"countUnexpiredTokens\",\"generate\",\"renew\",\"renew\",\"countUnexpiredTokens\"]\n[[5],[\"aaa\",1],[\"aaa\",2],[6],[\"bbb\",7],[\"aaa\",8],[\"bbb\",10],[15]]", "metaData": "{\n \"classname\": \"AuthenticationManager\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"timeToLive\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"tokenId\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"currentTime\"\n }\n ],\n \"name\": \"generate\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"tokenId\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"currentTime\"\n }\n ],\n \"name\": \"renew\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"currentTime\"\n }\n ],\n \"name\": \"countUnexpiredTokens\",\n \"return\": {\n \"type\": \"integer\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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