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            "title": "Design HashSet",
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            "content": "<p>Design a HashSet without using any built-in hash table libraries.</p>\n\n<p>Implement <code>MyHashSet</code> class:</p>\n\n<ul>\n\t<li><code>void add(key)</code> Inserts the value <code>key</code> into the HashSet.</li>\n\t<li><code>bool contains(key)</code> Returns whether the value <code>key</code> exists in the HashSet or not.</li>\n\t<li><code>void remove(key)</code> Removes the value <code>key</code> in the HashSet. If <code>key</code> does not exist in the HashSet, do nothing.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;MyHashSet&quot;, &quot;add&quot;, &quot;add&quot;, &quot;contains&quot;, &quot;contains&quot;, &quot;add&quot;, &quot;contains&quot;, &quot;remove&quot;, &quot;contains&quot;]\n[[], [1], [2], [1], [3], [2], [2], [2], [2]]\n<strong>Output</strong>\n[null, null, null, true, false, null, true, null, false]\n\n<strong>Explanation</strong>\nMyHashSet myHashSet = new MyHashSet();\nmyHashSet.add(1);      // set = [1]\nmyHashSet.add(2);      // set = [1, 2]\nmyHashSet.contains(1); // return True\nmyHashSet.contains(3); // return False, (not found)\nmyHashSet.add(2);      // set = [1, 2]\nmyHashSet.contains(2); // return True\nmyHashSet.remove(2);   // set = [1]\nmyHashSet.contains(2); // return False, (already removed)</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= key &lt;= 10<sup>6</sup></code></li>\n\t<li>At most <code>10<sup>4</sup></code> calls will be made to <code>add</code>, <code>remove</code>, and <code>contains</code>.</li>\n</ul>\n",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class MyHashSet {\npublic:\n    MyHashSet() {\n        \n    }\n    \n    void add(int key) {\n        \n    }\n    \n    void remove(int key) {\n        \n    }\n    \n    bool contains(int key) {\n        \n    }\n};\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * MyHashSet* obj = new MyHashSet();\n * obj->add(key);\n * obj->remove(key);\n * bool param_3 = obj->contains(key);\n */",
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                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class MyHashSet {\n\n    public MyHashSet() {\n        \n    }\n    \n    public void add(int key) {\n        \n    }\n    \n    public void remove(int key) {\n        \n    }\n    \n    public boolean contains(int key) {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * MyHashSet obj = new MyHashSet();\n * obj.add(key);\n * obj.remove(key);\n * boolean param_3 = obj.contains(key);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class MyHashSet(object):\n\n    def __init__(self):\n        \n\n    def add(self, key):\n        \"\"\"\n        :type key: int\n        :rtype: None\n        \"\"\"\n        \n\n    def remove(self, key):\n        \"\"\"\n        :type key: int\n        :rtype: None\n        \"\"\"\n        \n\n    def contains(self, key):\n        \"\"\"\n        :type key: int\n        :rtype: bool\n        \"\"\"\n        \n\n\n# Your MyHashSet object will be instantiated and called as such:\n# obj = MyHashSet()\n# obj.add(key)\n# obj.remove(key)\n# param_3 = obj.contains(key)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class MyHashSet:\n\n    def __init__(self):\n        \n\n    def add(self, key: int) -> None:\n        \n\n    def remove(self, key: int) -> None:\n        \n\n    def contains(self, key: int) -> bool:\n        \n\n\n# Your MyHashSet object will be instantiated and called as such:\n# obj = MyHashSet()\n# obj.add(key)\n# obj.remove(key)\n# param_3 = obj.contains(key)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} MyHashSet;\n\n\nMyHashSet* myHashSetCreate() {\n    \n}\n\nvoid myHashSetAdd(MyHashSet* obj, int key) {\n    \n}\n\nvoid myHashSetRemove(MyHashSet* obj, int key) {\n    \n}\n\nbool myHashSetContains(MyHashSet* obj, int key) {\n    \n}\n\nvoid myHashSetFree(MyHashSet* obj) {\n    \n}\n\n/**\n * Your MyHashSet struct will be instantiated and called as such:\n * MyHashSet* obj = myHashSetCreate();\n * myHashSetAdd(obj, key);\n \n * myHashSetRemove(obj, key);\n \n * bool param_3 = myHashSetContains(obj, key);\n \n * myHashSetFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class MyHashSet {\n\n    public MyHashSet() {\n        \n    }\n    \n    public void Add(int key) {\n        \n    }\n    \n    public void Remove(int key) {\n        \n    }\n    \n    public bool Contains(int key) {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * MyHashSet obj = new MyHashSet();\n * obj.Add(key);\n * obj.Remove(key);\n * bool param_3 = obj.Contains(key);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar MyHashSet = function() {\n    \n};\n\n/** \n * @param {number} key\n * @return {void}\n */\nMyHashSet.prototype.add = function(key) {\n    \n};\n\n/** \n * @param {number} key\n * @return {void}\n */\nMyHashSet.prototype.remove = function(key) {\n    \n};\n\n/** \n * @param {number} key\n * @return {boolean}\n */\nMyHashSet.prototype.contains = function(key) {\n    \n};\n\n/** \n * Your MyHashSet object will be instantiated and called as such:\n * var obj = new MyHashSet()\n * obj.add(key)\n * obj.remove(key)\n * var param_3 = obj.contains(key)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class MyHashSet {\n    constructor() {\n        \n    }\n\n    add(key: number): void {\n        \n    }\n\n    remove(key: number): void {\n        \n    }\n\n    contains(key: number): boolean {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * var obj = new MyHashSet()\n * obj.add(key)\n * obj.remove(key)\n * var param_3 = obj.contains(key)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class MyHashSet {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $key\n     * @return NULL\n     */\n    function add($key) {\n        \n    }\n  \n    /**\n     * @param Integer $key\n     * @return NULL\n     */\n    function remove($key) {\n        \n    }\n  \n    /**\n     * @param Integer $key\n     * @return Boolean\n     */\n    function contains($key) {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * $obj = MyHashSet();\n * $obj->add($key);\n * $obj->remove($key);\n * $ret_3 = $obj->contains($key);\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass MyHashSet {\n\n    init() {\n        \n    }\n    \n    func add(_ key: Int) {\n        \n    }\n    \n    func remove(_ key: Int) {\n        \n    }\n    \n    func contains(_ key: Int) -> Bool {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * let obj = MyHashSet()\n * obj.add(key)\n * obj.remove(key)\n * let ret_3: Bool = obj.contains(key)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class MyHashSet() {\n\n    fun add(key: Int) {\n        \n    }\n\n    fun remove(key: Int) {\n        \n    }\n\n    fun contains(key: Int): Boolean {\n        \n    }\n\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * var obj = MyHashSet()\n * obj.add(key)\n * obj.remove(key)\n * var param_3 = obj.contains(key)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Dart",
                    "langSlug": "dart",
                    "code": "class MyHashSet {\n\n  MyHashSet() {\n    \n  }\n  \n  void add(int key) {\n    \n  }\n  \n  void remove(int key) {\n    \n  }\n  \n  bool contains(int key) {\n    \n  }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * MyHashSet obj = MyHashSet();\n * obj.add(key);\n * obj.remove(key);\n * bool param3 = obj.contains(key);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type MyHashSet struct {\n    \n}\n\n\nfunc Constructor() MyHashSet {\n    \n}\n\n\nfunc (this *MyHashSet) Add(key int)  {\n    \n}\n\n\nfunc (this *MyHashSet) Remove(key int)  {\n    \n}\n\n\nfunc (this *MyHashSet) Contains(key int) bool {\n    \n}\n\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Add(key);\n * obj.Remove(key);\n * param_3 := obj.Contains(key);\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class MyHashSet\n    def initialize()\n        \n    end\n\n\n=begin\n    :type key: Integer\n    :rtype: Void\n=end\n    def add(key)\n        \n    end\n\n\n=begin\n    :type key: Integer\n    :rtype: Void\n=end\n    def remove(key)\n        \n    end\n\n\n=begin\n    :type key: Integer\n    :rtype: Boolean\n=end\n    def contains(key)\n        \n    end\n\n\nend\n\n# Your MyHashSet object will be instantiated and called as such:\n# obj = MyHashSet.new()\n# obj.add(key)\n# obj.remove(key)\n# param_3 = obj.contains(key)",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class MyHashSet() {\n\n    def add(key: Int) {\n        \n    }\n\n    def remove(key: Int) {\n        \n    }\n\n    def contains(key: Int): Boolean = {\n        \n    }\n\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * var obj = new MyHashSet()\n * obj.add(key)\n * obj.remove(key)\n * var param_3 = obj.contains(key)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct MyHashSet {\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 MyHashSet {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn add(&self, key: i32) {\n        \n    }\n    \n    fn remove(&self, key: i32) {\n        \n    }\n    \n    fn contains(&self, key: i32) -> bool {\n        \n    }\n}\n\n/**\n * Your MyHashSet object will be instantiated and called as such:\n * let obj = MyHashSet::new();\n * obj.add(key);\n * obj.remove(key);\n * let ret_3: bool = obj.contains(key);\n */",
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                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define my-hash-set%\n  (class object%\n    (super-new)\n    \n    (init-field)\n    \n    ; add : exact-integer? -> void?\n    (define/public (add key)\n      )\n    ; remove : exact-integer? -> void?\n    (define/public (remove key)\n      )\n    ; contains : exact-integer? -> boolean?\n    (define/public (contains key)\n      )))\n\n;; Your my-hash-set% object will be instantiated and called as such:\n;; (define obj (new my-hash-set%))\n;; (send obj add key)\n;; (send obj remove key)\n;; (define param_3 (send obj contains key))",
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                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec my_hash_set_init_() -> any().\nmy_hash_set_init_() ->\n  .\n\n-spec my_hash_set_add(Key :: integer()) -> any().\nmy_hash_set_add(Key) ->\n  .\n\n-spec my_hash_set_remove(Key :: integer()) -> any().\nmy_hash_set_remove(Key) ->\n  .\n\n-spec my_hash_set_contains(Key :: integer()) -> boolean().\nmy_hash_set_contains(Key) ->\n  .\n\n\n%% Your functions will be called as such:\n%% my_hash_set_init_(),\n%% my_hash_set_add(Key),\n%% my_hash_set_remove(Key),\n%% Param_3 = my_hash_set_contains(Key),\n\n%% my_hash_set_init_ will be called before every test case, in which you can do some necessary initializations.",
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                    "lang": "Elixir",
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                    "code": "defmodule MyHashSet do\n  @spec init_() :: any\n  def init_() do\n    \n  end\n\n  @spec add(key :: integer) :: any\n  def add(key) do\n    \n  end\n\n  @spec remove(key :: integer) :: any\n  def remove(key) do\n    \n  end\n\n  @spec contains(key :: integer) :: boolean\n  def contains(key) do\n    \n  end\nend\n\n# Your functions will be called as such:\n# MyHashSet.init_()\n# MyHashSet.add(key)\n# MyHashSet.remove(key)\n# param_3 = MyHashSet.contains(key)\n\n# MyHashSet.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code>OpenJDK 17</code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu11 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://github.com/datastructures-js/queue/tree/e63563025a5a805aa16928cb53bcd517bfea9230\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"ruby\": [\"Ruby\", \"<p><code>Ruby 3.1</code></p>\\r\\n\\r\\n<p>Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms</p>\"], \"swift\": [\"Swift\", \"<p><code>Swift 5.5.2</code>.</p>\"], \"golang\": [\"Go\", \"<p><code>Go 1.21</code></p>\\r\\n<p>Support <a href=\\\"https://github.com/emirpasic/gods/tree/v1.18.1\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods@v1.18.1</a> library.</p>\"], \"python3\": [\"Python3\", \"<p><code>Python 3.10</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/3/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/3/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/3/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\"], \"scala\": [\"Scala\", \"<p><code>Scala 2.13.7</code>.</p>\"], \"kotlin\": [\"Kotlin\", \"<p><code>Kotlin 1.9.0</code>.</p>\"], \"rust\": [\"Rust\", \"<p><code>Rust 1.58.1</code></p>\\r\\n\\r\\n<p>Supports <a href=\\\"https://crates.io/crates/rand\\\" target=\\\"_blank\\\">rand </a> v0.6\\u00a0from crates.io</p>\"], \"php\": [\"PHP\", \"<p><code>PHP 8.1</code>.</p>\\r\\n<p>With bcmath module</p>\"], \"typescript\": [\"Typescript\", \"<p><code>TypeScript 5.1.6, Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES2022 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\"], \"racket\": [\"Racket\", \"<p>Run with <code>Racket 8.3</code>.</p>\"], \"erlang\": [\"Erlang\", \"Erlang/OTP 25.0\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.4 with Erlang/OTP 25.0\"], \"dart\": [\"Dart\", \"<p>Dart 2.17.3</p>\\r\\n\\r\\n<p>Your code will be run directly without compiling</p>\"]}",
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            "challengeQuestion": {
                "id": "1353",
                "date": "2023-05-30",
                "incompleteChallengeCount": 0,
                "streakCount": 0,
                "type": "DAILY",
                "__typename": "ChallengeQuestionNode"
            },
            "__typename": "QuestionNode"
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