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    "data": {
        "question": {
            "questionId": "838",
            "questionFrontendId": "707",
            "boundTopicId": null,
            "title": "Design Linked List",
            "titleSlug": "design-linked-list",
            "content": "<p>Design your implementation of the linked list. You can choose to use a singly or doubly linked list.<br />\nA node in a singly linked list should have two attributes: <code>val</code> and <code>next</code>. <code>val</code> is the value of the current node, and <code>next</code> is a pointer/reference to the next node.<br />\nIf you want to use the doubly linked list, you will need one more attribute <code>prev</code> to indicate the previous node in the linked list. Assume all nodes in the linked list are <strong>0-indexed</strong>.</p>\n\n<p>Implement the <code>MyLinkedList</code> class:</p>\n\n<ul>\n\t<li><code>MyLinkedList()</code> Initializes the <code>MyLinkedList</code> object.</li>\n\t<li><code>int get(int index)</code> Get the value of the <code>index<sup>th</sup></code> node in the linked list. If the index is invalid, return <code>-1</code>.</li>\n\t<li><code>void addAtHead(int val)</code> Add a node of value <code>val</code> before the first element of the linked list. After the insertion, the new node will be the first node of the linked list.</li>\n\t<li><code>void addAtTail(int val)</code> Append a node of value <code>val</code> as the last element of the linked list.</li>\n\t<li><code>void addAtIndex(int index, int val)</code> Add a node of value <code>val</code> before the <code>index<sup>th</sup></code> node in the linked list. If <code>index</code> equals the length of the linked list, the node will be appended to the end of the linked list. If <code>index</code> is greater than the length, the node <strong>will not be inserted</strong>.</li>\n\t<li><code>void deleteAtIndex(int index)</code> Delete the <code>index<sup>th</sup></code> node in the linked list, if the index is valid.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;MyLinkedList&quot;, &quot;addAtHead&quot;, &quot;addAtTail&quot;, &quot;addAtIndex&quot;, &quot;get&quot;, &quot;deleteAtIndex&quot;, &quot;get&quot;]\n[[], [1], [3], [1, 2], [1], [1], [1]]\n<strong>Output</strong>\n[null, null, null, null, 2, null, 3]\n\n<strong>Explanation</strong>\nMyLinkedList myLinkedList = new MyLinkedList();\nmyLinkedList.addAtHead(1);\nmyLinkedList.addAtTail(3);\nmyLinkedList.addAtIndex(1, 2);    // linked list becomes 1-&gt;2-&gt;3\nmyLinkedList.get(1);              // return 2\nmyLinkedList.deleteAtIndex(1);    // now the linked list is 1-&gt;3\nmyLinkedList.get(1);              // return 3\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= index, val &lt;= 1000</code></li>\n\t<li>Please do not use the built-in LinkedList library.</li>\n\t<li>At most <code>2000</code> calls will be made to <code>get</code>, <code>addAtHead</code>, <code>addAtTail</code>, <code>addAtIndex</code> and <code>deleteAtIndex</code>.</li>\n</ul>\n",
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            "difficulty": "Medium",
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            "exampleTestcases": "[\"MyLinkedList\",\"addAtHead\",\"addAtTail\",\"addAtIndex\",\"get\",\"deleteAtIndex\",\"get\"]\n[[],[1],[3],[1,2],[1],[1],[1]]",
            "categoryTitle": "Algorithms",
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                    "name": "Linked List",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class MyLinkedList {\npublic:\n    MyLinkedList() {\n        \n    }\n    \n    int get(int index) {\n        \n    }\n    \n    void addAtHead(int val) {\n        \n    }\n    \n    void addAtTail(int val) {\n        \n    }\n    \n    void addAtIndex(int index, int val) {\n        \n    }\n    \n    void deleteAtIndex(int index) {\n        \n    }\n};\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * MyLinkedList* obj = new MyLinkedList();\n * int param_1 = obj->get(index);\n * obj->addAtHead(val);\n * obj->addAtTail(val);\n * obj->addAtIndex(index,val);\n * obj->deleteAtIndex(index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class MyLinkedList {\n\n    public MyLinkedList() {\n        \n    }\n    \n    public int get(int index) {\n        \n    }\n    \n    public void addAtHead(int val) {\n        \n    }\n    \n    public void addAtTail(int val) {\n        \n    }\n    \n    public void addAtIndex(int index, int val) {\n        \n    }\n    \n    public void deleteAtIndex(int index) {\n        \n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * MyLinkedList obj = new MyLinkedList();\n * int param_1 = obj.get(index);\n * obj.addAtHead(val);\n * obj.addAtTail(val);\n * obj.addAtIndex(index,val);\n * obj.deleteAtIndex(index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class MyLinkedList(object):\n\n    def __init__(self):\n        \n\n    def get(self, index):\n        \"\"\"\n        :type index: int\n        :rtype: int\n        \"\"\"\n        \n\n    def addAtHead(self, val):\n        \"\"\"\n        :type val: int\n        :rtype: None\n        \"\"\"\n        \n\n    def addAtTail(self, val):\n        \"\"\"\n        :type val: int\n        :rtype: None\n        \"\"\"\n        \n\n    def addAtIndex(self, index, val):\n        \"\"\"\n        :type index: int\n        :type val: int\n        :rtype: None\n        \"\"\"\n        \n\n    def deleteAtIndex(self, index):\n        \"\"\"\n        :type index: int\n        :rtype: None\n        \"\"\"\n        \n\n\n# Your MyLinkedList object will be instantiated and called as such:\n# obj = MyLinkedList()\n# param_1 = obj.get(index)\n# obj.addAtHead(val)\n# obj.addAtTail(val)\n# obj.addAtIndex(index,val)\n# obj.deleteAtIndex(index)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class MyLinkedList:\n\n    def __init__(self):\n        \n\n    def get(self, index: int) -> int:\n        \n\n    def addAtHead(self, val: int) -> None:\n        \n\n    def addAtTail(self, val: int) -> None:\n        \n\n    def addAtIndex(self, index: int, val: int) -> None:\n        \n\n    def deleteAtIndex(self, index: int) -> None:\n        \n\n\n# Your MyLinkedList object will be instantiated and called as such:\n# obj = MyLinkedList()\n# param_1 = obj.get(index)\n# obj.addAtHead(val)\n# obj.addAtTail(val)\n# obj.addAtIndex(index,val)\n# obj.deleteAtIndex(index)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} MyLinkedList;\n\n\nMyLinkedList* myLinkedListCreate() {\n    \n}\n\nint myLinkedListGet(MyLinkedList* obj, int index) {\n  \n}\n\nvoid myLinkedListAddAtHead(MyLinkedList* obj, int val) {\n  \n}\n\nvoid myLinkedListAddAtTail(MyLinkedList* obj, int val) {\n  \n}\n\nvoid myLinkedListAddAtIndex(MyLinkedList* obj, int index, int val) {\n  \n}\n\nvoid myLinkedListDeleteAtIndex(MyLinkedList* obj, int index) {\n  \n}\n\nvoid myLinkedListFree(MyLinkedList* obj) {\n    \n}\n\n/**\n * Your MyLinkedList struct will be instantiated and called as such:\n * MyLinkedList* obj = myLinkedListCreate();\n * int param_1 = myLinkedListGet(obj, index);\n \n * myLinkedListAddAtHead(obj, val);\n \n * myLinkedListAddAtTail(obj, val);\n \n * myLinkedListAddAtIndex(obj, index, val);\n \n * myLinkedListDeleteAtIndex(obj, index);\n \n * myLinkedListFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class MyLinkedList {\n\n    public MyLinkedList() {\n        \n    }\n    \n    public int Get(int index) {\n        \n    }\n    \n    public void AddAtHead(int val) {\n        \n    }\n    \n    public void AddAtTail(int val) {\n        \n    }\n    \n    public void AddAtIndex(int index, int val) {\n        \n    }\n    \n    public void DeleteAtIndex(int index) {\n        \n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * MyLinkedList obj = new MyLinkedList();\n * int param_1 = obj.Get(index);\n * obj.AddAtHead(val);\n * obj.AddAtTail(val);\n * obj.AddAtIndex(index,val);\n * obj.DeleteAtIndex(index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar MyLinkedList = function() {\n    \n};\n\n/** \n * @param {number} index\n * @return {number}\n */\nMyLinkedList.prototype.get = function(index) {\n    \n};\n\n/** \n * @param {number} val\n * @return {void}\n */\nMyLinkedList.prototype.addAtHead = function(val) {\n    \n};\n\n/** \n * @param {number} val\n * @return {void}\n */\nMyLinkedList.prototype.addAtTail = function(val) {\n    \n};\n\n/** \n * @param {number} index \n * @param {number} val\n * @return {void}\n */\nMyLinkedList.prototype.addAtIndex = function(index, val) {\n    \n};\n\n/** \n * @param {number} index\n * @return {void}\n */\nMyLinkedList.prototype.deleteAtIndex = function(index) {\n    \n};\n\n/** \n * Your MyLinkedList object will be instantiated and called as such:\n * var obj = new MyLinkedList()\n * var param_1 = obj.get(index)\n * obj.addAtHead(val)\n * obj.addAtTail(val)\n * obj.addAtIndex(index,val)\n * obj.deleteAtIndex(index)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class MyLinkedList\n    def initialize()\n        \n    end\n\n\n=begin\n    :type index: Integer\n    :rtype: Integer\n=end\n    def get(index)\n        \n    end\n\n\n=begin\n    :type val: Integer\n    :rtype: Void\n=end\n    def add_at_head(val)\n        \n    end\n\n\n=begin\n    :type val: Integer\n    :rtype: Void\n=end\n    def add_at_tail(val)\n        \n    end\n\n\n=begin\n    :type index: Integer\n    :type val: Integer\n    :rtype: Void\n=end\n    def add_at_index(index, val)\n        \n    end\n\n\n=begin\n    :type index: Integer\n    :rtype: Void\n=end\n    def delete_at_index(index)\n        \n    end\n\n\nend\n\n# Your MyLinkedList object will be instantiated and called as such:\n# obj = MyLinkedList.new()\n# param_1 = obj.get(index)\n# obj.add_at_head(val)\n# obj.add_at_tail(val)\n# obj.add_at_index(index, val)\n# obj.delete_at_index(index)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass MyLinkedList {\n\n    init() {\n        \n    }\n    \n    func get(_ index: Int) -> Int {\n        \n    }\n    \n    func addAtHead(_ val: Int) {\n        \n    }\n    \n    func addAtTail(_ val: Int) {\n        \n    }\n    \n    func addAtIndex(_ index: Int, _ val: Int) {\n        \n    }\n    \n    func deleteAtIndex(_ index: Int) {\n        \n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * let obj = MyLinkedList()\n * let ret_1: Int = obj.get(index)\n * obj.addAtHead(val)\n * obj.addAtTail(val)\n * obj.addAtIndex(index, val)\n * obj.deleteAtIndex(index)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type MyLinkedList struct {\n    \n}\n\n\nfunc Constructor() MyLinkedList {\n    \n}\n\n\nfunc (this *MyLinkedList) Get(index int) int {\n    \n}\n\n\nfunc (this *MyLinkedList) AddAtHead(val int)  {\n    \n}\n\n\nfunc (this *MyLinkedList) AddAtTail(val int)  {\n    \n}\n\n\nfunc (this *MyLinkedList) AddAtIndex(index int, val int)  {\n    \n}\n\n\nfunc (this *MyLinkedList) DeleteAtIndex(index int)  {\n    \n}\n\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * obj := Constructor();\n * param_1 := obj.Get(index);\n * obj.AddAtHead(val);\n * obj.AddAtTail(val);\n * obj.AddAtIndex(index,val);\n * obj.DeleteAtIndex(index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class MyLinkedList() {\n\n    def get(index: Int): Int = {\n        \n    }\n\n    def addAtHead(`val`: Int) {\n        \n    }\n\n    def addAtTail(`val`: Int) {\n        \n    }\n\n    def addAtIndex(index: Int, `val`: Int) {\n        \n    }\n\n    def deleteAtIndex(index: Int) {\n        \n    }\n\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * var obj = new MyLinkedList()\n * var param_1 = obj.get(index)\n * obj.addAtHead(`val`)\n * obj.addAtTail(`val`)\n * obj.addAtIndex(index,`val`)\n * obj.deleteAtIndex(index)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class MyLinkedList() {\n\n    fun get(index: Int): Int {\n        \n    }\n\n    fun addAtHead(`val`: Int) {\n        \n    }\n\n    fun addAtTail(`val`: Int) {\n        \n    }\n\n    fun addAtIndex(index: Int, `val`: Int) {\n        \n    }\n\n    fun deleteAtIndex(index: Int) {\n        \n    }\n\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * var obj = MyLinkedList()\n * var param_1 = obj.get(index)\n * obj.addAtHead(`val`)\n * obj.addAtTail(`val`)\n * obj.addAtIndex(index,`val`)\n * obj.deleteAtIndex(index)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct MyLinkedList {\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 MyLinkedList {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn get(&self, index: i32) -> i32 {\n        \n    }\n    \n    fn add_at_head(&self, val: i32) {\n        \n    }\n    \n    fn add_at_tail(&self, val: i32) {\n        \n    }\n    \n    fn add_at_index(&self, index: i32, val: i32) {\n        \n    }\n    \n    fn delete_at_index(&self, index: i32) {\n        \n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * let obj = MyLinkedList::new();\n * let ret_1: i32 = obj.get(index);\n * obj.add_at_head(val);\n * obj.add_at_tail(val);\n * obj.add_at_index(index, val);\n * obj.delete_at_index(index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class MyLinkedList {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $index\n     * @return Integer\n     */\n    function get($index) {\n        \n    }\n  \n    /**\n     * @param Integer $val\n     * @return NULL\n     */\n    function addAtHead($val) {\n        \n    }\n  \n    /**\n     * @param Integer $val\n     * @return NULL\n     */\n    function addAtTail($val) {\n        \n    }\n  \n    /**\n     * @param Integer $index\n     * @param Integer $val\n     * @return NULL\n     */\n    function addAtIndex($index, $val) {\n        \n    }\n  \n    /**\n     * @param Integer $index\n     * @return NULL\n     */\n    function deleteAtIndex($index) {\n        \n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * $obj = MyLinkedList();\n * $ret_1 = $obj->get($index);\n * $obj->addAtHead($val);\n * $obj->addAtTail($val);\n * $obj->addAtIndex($index, $val);\n * $obj->deleteAtIndex($index);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class MyLinkedList {\n    constructor() {\n\n    }\n\n    get(index: number): number {\n\n    }\n\n    addAtHead(val: number): void {\n\n    }\n\n    addAtTail(val: number): void {\n\n    }\n\n    addAtIndex(index: number, val: number): void {\n\n    }\n\n    deleteAtIndex(index: number): void {\n\n    }\n}\n\n/**\n * Your MyLinkedList object will be instantiated and called as such:\n * var obj = new MyLinkedList()\n * var param_1 = obj.get(index)\n * obj.addAtHead(val)\n * obj.addAtTail(val)\n * obj.addAtIndex(index,val)\n * obj.deleteAtIndex(index)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define my-linked-list%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; get : exact-integer? -> exact-integer?\n    (define/public (get index)\n\n      )\n    ; add-at-head : exact-integer? -> void?\n    (define/public (add-at-head val)\n\n      )\n    ; add-at-tail : exact-integer? -> void?\n    (define/public (add-at-tail val)\n\n      )\n    ; add-at-index : exact-integer? exact-integer? -> void?\n    (define/public (add-at-index index val)\n\n      )\n    ; delete-at-index : exact-integer? -> void?\n    (define/public (delete-at-index index)\n\n      )))\n\n;; Your my-linked-list% object will be instantiated and called as such:\n;; (define obj (new my-linked-list%))\n;; (define param_1 (send obj get index))\n;; (send obj add-at-head val)\n;; (send obj add-at-tail val)\n;; (send obj add-at-index index val)\n;; (send obj delete-at-index index)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec my_linked_list_init_() -> any().\nmy_linked_list_init_() ->\n  .\n\n-spec my_linked_list_get(Index :: integer()) -> integer().\nmy_linked_list_get(Index) ->\n  .\n\n-spec my_linked_list_add_at_head(Val :: integer()) -> any().\nmy_linked_list_add_at_head(Val) ->\n  .\n\n-spec my_linked_list_add_at_tail(Val :: integer()) -> any().\nmy_linked_list_add_at_tail(Val) ->\n  .\n\n-spec my_linked_list_add_at_index(Index :: integer(), Val :: integer()) -> any().\nmy_linked_list_add_at_index(Index, Val) ->\n  .\n\n-spec my_linked_list_delete_at_index(Index :: integer()) -> any().\nmy_linked_list_delete_at_index(Index) ->\n  .\n\n\n%% Your functions will be called as such:\n%% my_linked_list_init_(),\n%% Param_1 = my_linked_list_get(Index),\n%% my_linked_list_add_at_head(Val),\n%% my_linked_list_add_at_tail(Val),\n%% my_linked_list_add_at_index(Index, Val),\n%% my_linked_list_delete_at_index(Index),\n\n%% my_linked_list_init_ will be called before every test case, in which you can do some necessary initializations.",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule MyLinkedList do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec get(index :: integer) :: integer\n  def get(index) do\n\n  end\n\n  @spec add_at_head(val :: integer) :: any\n  def add_at_head(val) do\n\n  end\n\n  @spec add_at_tail(val :: integer) :: any\n  def add_at_tail(val) do\n\n  end\n\n  @spec add_at_index(index :: integer, val :: integer) :: any\n  def add_at_index(index, val) do\n\n  end\n\n  @spec delete_at_index(index :: integer) :: any\n  def delete_at_index(index) do\n\n  end\nend\n\n# Your functions will be called as such:\n# MyLinkedList.init_()\n# param_1 = MyLinkedList.get(index)\n# MyLinkedList.add_at_head(val)\n# MyLinkedList.add_at_tail(val)\n# MyLinkedList.add_at_index(index, val)\n# MyLinkedList.delete_at_index(index)\n\n# MyLinkedList.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "sampleTestCase": "[\"MyLinkedList\",\"addAtHead\",\"addAtTail\",\"addAtIndex\",\"get\",\"deleteAtIndex\",\"get\"]\n[[],[1],[3],[1,2],[1],[1],[1]]",
            "metaData": "{\n  \"classname\": \"MyLinkedList\",\n  \"constructor\": {\n    \"params\": []\n  },\n  \"methods\": [\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"index\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"integer\"\n      },\n      \"name\": \"get\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"val\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"addAtHead\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"val\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"addAtTail\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"index\"\n        },\n        {\n          \"type\": \"integer\",\n          \"name\": \"val\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"addAtIndex\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"index\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"deleteAtIndex\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"boolean\"\n  },\n  \"systemdesign\": true\n}",
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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 gnu99 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://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</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 <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https://github.com/datastructures-js/queue\\\" 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 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</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>. 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