{ "data": { "question": { "questionId": "380", "questionFrontendId": "380", "categoryTitle": "Algorithms", "boundTopicId": 1894, "title": "Insert Delete GetRandom O(1)", "titleSlug": "insert-delete-getrandom-o1", "content": "

Implement the RandomizedSet class:

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You must implement the functions of the class such that each function works in average O(1) time complexity.

\n\n

 

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Example 1:

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\nInput\n["RandomizedSet", "insert", "remove", "insert", "getRandom", "remove", "insert", "getRandom"]\n[[], [1], [2], [2], [], [1], [2], []]\nOutput\n[null, true, false, true, 2, true, false, 2]\n\nExplanation\nRandomizedSet randomizedSet = new RandomizedSet();\nrandomizedSet.insert(1); // Inserts 1 to the set. Returns true as 1 was inserted successfully.\nrandomizedSet.remove(2); // Returns false as 2 does not exist in the set.\nrandomizedSet.insert(2); // Inserts 2 to the set, returns true. Set now contains [1,2].\nrandomizedSet.getRandom(); // getRandom() should return either 1 or 2 randomly.\nrandomizedSet.remove(1); // Removes 1 from the set, returns true. Set now contains [2].\nrandomizedSet.insert(2); // 2 was already in the set, so return false.\nrandomizedSet.getRandom(); // Since 2 is the only number in the set, getRandom() will always return 2.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "O(1) 时间插入、删除和获取随机元素", "translatedContent": "

实现RandomizedSet 类：

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\n
\n\n\n

你必须实现类的所有函数，并满足每个函数的 平均 时间复杂度为 O(1) 。

\n\n

 

\n\n

示例：

\n\n
\n输入\n[\"RandomizedSet\", \"insert\", \"remove\", \"insert\", \"getRandom\", \"remove\", \"insert\", \"getRandom\"]\n[[], [1], [2], [2], [], [1], [2], []]\n输出\n[null, true, false, true, 2, true, false, 2]\n\n解释\nRandomizedSet randomizedSet = new RandomizedSet();\nrandomizedSet.insert(1); // 向集合中插入 1 。返回 true 表示 1 被成功地插入。\nrandomizedSet.remove(2); // 返回 false ，表示集合中不存在 2 。\nrandomizedSet.insert(2); // 向集合中插入 2 。返回 true 。集合现在包含 [1,2] 。\nrandomizedSet.getRandom(); // getRandom 应随机返回 1 或 2 。\nrandomizedSet.remove(1); // 从集合中移除 1 ，返回 true 。集合现在包含 [2] 。\nrandomizedSet.insert(2); // 2 已在集合中，所以返回 false 。\nrandomizedSet.getRandom(); // 由于 2 是集合中唯一的数字，getRandom 总是返回 2 。\n
\n\n

 

\n\n

提示：

\n\n\n
\n
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"java", "code": "class RandomizedSet {\n\n public RandomizedSet() {\n\n }\n \n public boolean insert(int val) {\n\n }\n \n public boolean remove(int val) {\n\n }\n \n public int getRandom() {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * RandomizedSet obj = new RandomizedSet();\n * boolean param_1 = obj.insert(val);\n * boolean param_2 = obj.remove(val);\n * int param_3 = obj.getRandom();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class RandomizedSet(object):\n\n def __init__(self):\n\n\n def insert(self, val):\n \"\"\"\n :type val: int\n :rtype: bool\n \"\"\"\n\n\n def remove(self, val):\n \"\"\"\n :type val: int\n :rtype: bool\n \"\"\"\n\n\n def getRandom(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n\n# Your RandomizedSet object will be instantiated and called as such:\n# obj = RandomizedSet()\n# param_1 = obj.insert(val)\n# param_2 = obj.remove(val)\n# param_3 = obj.getRandom()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class RandomizedSet:\n\n def __init__(self):\n\n\n def insert(self, val: int) -> bool:\n\n\n def remove(self, val: int) -> bool:\n\n\n def getRandom(self) -> int:\n\n\n\n# Your RandomizedSet object will be instantiated and called as such:\n# obj = RandomizedSet()\n# param_1 = obj.insert(val)\n# param_2 = obj.remove(val)\n# param_3 = obj.getRandom()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} RandomizedSet;\n\n\nRandomizedSet* randomizedSetCreate() {\n\n}\n\nbool randomizedSetInsert(RandomizedSet* obj, int val) {\n\n}\n\nbool randomizedSetRemove(RandomizedSet* obj, int val) {\n\n}\n\nint randomizedSetGetRandom(RandomizedSet* obj) {\n\n}\n\nvoid randomizedSetFree(RandomizedSet* obj) {\n\n}\n\n/**\n * Your RandomizedSet struct will be instantiated and called as such:\n * RandomizedSet* obj = randomizedSetCreate();\n * bool param_1 = randomizedSetInsert(obj, val);\n \n * bool param_2 = randomizedSetRemove(obj, val);\n \n * int param_3 = randomizedSetGetRandom(obj);\n \n * randomizedSetFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class RandomizedSet {\n\n public RandomizedSet() {\n\n }\n \n public bool Insert(int val) {\n\n }\n \n public bool Remove(int val) {\n\n }\n \n public int GetRandom() {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * RandomizedSet obj = new RandomizedSet();\n * bool param_1 = obj.Insert(val);\n * bool param_2 = obj.Remove(val);\n * int param_3 = obj.GetRandom();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar RandomizedSet = function() {\n\n};\n\n/** \n * @param {number} val\n * @return {boolean}\n */\nRandomizedSet.prototype.insert = function(val) {\n\n};\n\n/** \n * @param {number} val\n * @return {boolean}\n */\nRandomizedSet.prototype.remove = function(val) {\n\n};\n\n/**\n * @return {number}\n */\nRandomizedSet.prototype.getRandom = function() {\n\n};\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * var obj = new RandomizedSet()\n * var param_1 = obj.insert(val)\n * var param_2 = obj.remove(val)\n * var param_3 = obj.getRandom()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class RandomizedSet\n def initialize()\n\n end\n\n\n=begin\n :type val: Integer\n :rtype: Boolean\n=end\n def insert(val)\n\n end\n\n\n=begin\n :type val: Integer\n :rtype: Boolean\n=end\n def remove(val)\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def get_random()\n\n end\n\n\nend\n\n# Your RandomizedSet object will be instantiated and called as such:\n# obj = RandomizedSet.new()\n# param_1 = obj.insert(val)\n# param_2 = obj.remove(val)\n# param_3 = obj.get_random()", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass RandomizedSet {\n\n init() {\n\n }\n \n func insert(_ val: Int) -> Bool {\n\n }\n \n func remove(_ val: Int) -> Bool {\n\n }\n \n func getRandom() -> Int {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * let obj = RandomizedSet()\n * let ret_1: Bool = obj.insert(val)\n * let ret_2: Bool = obj.remove(val)\n * let ret_3: Int = obj.getRandom()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type RandomizedSet struct {\n\n}\n\n\nfunc Constructor() RandomizedSet {\n\n}\n\n\nfunc (this *RandomizedSet) Insert(val int) bool {\n\n}\n\n\nfunc (this *RandomizedSet) Remove(val int) bool {\n\n}\n\n\nfunc (this *RandomizedSet) GetRandom() int {\n\n}\n\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * obj := Constructor();\n * param_1 := obj.Insert(val);\n * param_2 := obj.Remove(val);\n * param_3 := obj.GetRandom();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class RandomizedSet() {\n\n def insert(`val`: Int): Boolean = {\n\n }\n\n def remove(`val`: Int): Boolean = {\n\n }\n\n def getRandom(): Int = {\n\n }\n\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * var obj = new RandomizedSet()\n * var param_1 = obj.insert(`val`)\n * var param_2 = obj.remove(`val`)\n * var param_3 = obj.getRandom()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class RandomizedSet() {\n\n fun insert(`val`: Int): Boolean {\n\n }\n\n fun remove(`val`: Int): Boolean {\n\n }\n\n fun getRandom(): Int {\n\n }\n\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * var obj = RandomizedSet()\n * var param_1 = obj.insert(`val`)\n * var param_2 = obj.remove(`val`)\n * var param_3 = obj.getRandom()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct RandomizedSet {\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 RandomizedSet {\n\n fn new() -> Self {\n\n }\n \n fn insert(&self, val: i32) -> bool {\n\n }\n \n fn remove(&self, val: i32) -> bool {\n\n }\n \n fn get_random(&self) -> i32 {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * let obj = RandomizedSet::new();\n * let ret_1: bool = obj.insert(val);\n * let ret_2: bool = obj.remove(val);\n * let ret_3: i32 = obj.get_random();\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class RandomizedSet {\n /**\n */\n function __construct() {\n\n }\n\n /**\n * @param Integer $val\n * @return Boolean\n */\n function insert($val) {\n\n }\n\n /**\n * @param Integer $val\n * @return Boolean\n */\n function remove($val) {\n\n }\n\n /**\n * @return Integer\n */\n function getRandom() {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * $obj = RandomizedSet();\n * $ret_1 = $obj->insert($val);\n * $ret_2 = $obj->remove($val);\n * $ret_3 = $obj->getRandom();\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class RandomizedSet {\n constructor() {\n\n }\n\n insert(val: number): boolean {\n\n }\n\n remove(val: number): boolean {\n\n }\n\n getRandom(): number {\n\n }\n}\n\n/**\n * Your RandomizedSet object will be instantiated and called as such:\n * var obj = new RandomizedSet()\n * var param_1 = obj.insert(val)\n * var param_2 = obj.remove(val)\n * var param_3 = obj.getRandom()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define randomized-set%\n (class object%\n (super-new)\n (init-field)\n \n ; insert : exact-integer? -> boolean?\n (define/public (insert val)\n\n )\n ; remove : exact-integer? -> boolean?\n (define/public (remove val)\n\n )\n ; get-random : -> exact-integer?\n (define/public (get-random)\n\n )))\n\n;; Your randomized-set% object will be instantiated and called as such:\n;; (define obj (new randomized-set%))\n;; (define param_1 (send obj insert val))\n;; (define param_2 (send obj remove val))\n;; (define param_3 (send obj get-random))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec randomized_set_init_() -> any().\nrandomized_set_init_() ->\n .\n\n-spec randomized_set_insert(Val :: integer()) -> boolean().\nrandomized_set_insert(Val) ->\n .\n\n-spec randomized_set_remove(Val :: integer()) -> boolean().\nrandomized_set_remove(Val) ->\n .\n\n-spec randomized_set_get_random() -> integer().\nrandomized_set_get_random() ->\n .\n\n\n%% Your functions will be called as such:\n%% randomized_set_init_(),\n%% Param_1 = randomized_set_insert(Val),\n%% Param_2 = randomized_set_remove(Val),\n%% Param_3 = randomized_set_get_random(),\n\n%% randomized_set_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule RandomizedSet do\n @spec init_() :: any\n def init_() do\n\n end\n\n @spec insert(val :: integer) :: boolean\n def insert(val) do\n\n end\n\n @spec remove(val :: integer) :: boolean\n def remove(val) do\n\n end\n\n @spec get_random() :: integer\n def get_random() do\n\n end\nend\n\n# Your functions will be called as such:\n# RandomizedSet.init_()\n# param_1 = RandomizedSet.insert(val)\n# param_2 = RandomizedSet.remove(val)\n# param_3 = RandomizedSet.get_random()\n\n# RandomizedSet.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"77.5K\", \"totalSubmission\": \"146.6K\", \"totalAcceptedRaw\": 77482, \"totalSubmissionRaw\": 146552, \"acRate\": \"52.9%\"}", "hints": [], "solution": null, "status": null, 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