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        "question": {
            "questionId": "1955",
            "questionFrontendId": "1845",
            "boundTopicId": null,
            "title": "Seat Reservation Manager",
            "titleSlug": "seat-reservation-manager",
            "content": "<p>Design a system that manages the reservation state of <code>n</code> seats that are numbered from <code>1</code> to <code>n</code>.</p>\n\n<p>Implement the <code>SeatManager</code> class:</p>\n\n<ul>\n\t<li><code>SeatManager(int n)</code> Initializes a <code>SeatManager</code> object that will manage <code>n</code> seats numbered from <code>1</code> to <code>n</code>. All seats are initially available.</li>\n\t<li><code>int reserve()</code> Fetches the <strong>smallest-numbered</strong> unreserved seat, reserves it, and returns its number.</li>\n\t<li><code>void unreserve(int seatNumber)</code> Unreserves the seat with the given <code>seatNumber</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;SeatManager&quot;, &quot;reserve&quot;, &quot;reserve&quot;, &quot;unreserve&quot;, &quot;reserve&quot;, &quot;reserve&quot;, &quot;reserve&quot;, &quot;reserve&quot;, &quot;unreserve&quot;]\n[[5], [], [], [2], [], [], [], [], [5]]\n<strong>Output</strong>\n[null, 1, 2, null, 2, 3, 4, 5, null]\n\n<strong>Explanation</strong>\nSeatManager seatManager = new SeatManager(5); // Initializes a SeatManager with 5 seats.\nseatManager.reserve();    // All seats are available, so return the lowest numbered seat, which is 1.\nseatManager.reserve();    // The available seats are [2,3,4,5], so return the lowest of them, which is 2.\nseatManager.unreserve(2); // Unreserve seat 2, so now the available seats are [2,3,4,5].\nseatManager.reserve();    // The available seats are [2,3,4,5], so return the lowest of them, which is 2.\nseatManager.reserve();    // The available seats are [3,4,5], so return the lowest of them, which is 3.\nseatManager.reserve();    // The available seats are [4,5], so return the lowest of them, which is 4.\nseatManager.reserve();    // The only available seat is seat 5, so return 5.\nseatManager.unreserve(5); // Unreserve seat 5, so now the available seats are [5].\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= seatNumber &lt;= n</code></li>\n\t<li>For each call to <code>reserve</code>, it is guaranteed that there will be at least one unreserved seat.</li>\n\t<li>For each call to <code>unreserve</code>, it is guaranteed that <code>seatNumber</code> will be reserved.</li>\n\t<li>At most <code>10<sup>5</sup></code> calls <strong>in total</strong> will be made to <code>reserve</code> and <code>unreserve</code>.</li>\n</ul>\n",
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            "difficulty": "Medium",
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            "exampleTestcases": "[\"SeatManager\",\"reserve\",\"reserve\",\"unreserve\",\"reserve\",\"reserve\",\"reserve\",\"reserve\",\"unreserve\"]\n[[5],[],[],[2],[],[],[],[],[5]]",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class SeatManager {\npublic:\n    SeatManager(int n) {\n        \n    }\n    \n    int reserve() {\n        \n    }\n    \n    void unreserve(int seatNumber) {\n        \n    }\n};\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * SeatManager* obj = new SeatManager(n);\n * int param_1 = obj->reserve();\n * obj->unreserve(seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class SeatManager {\n\n    public SeatManager(int n) {\n        \n    }\n    \n    public int reserve() {\n        \n    }\n    \n    public void unreserve(int seatNumber) {\n        \n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * SeatManager obj = new SeatManager(n);\n * int param_1 = obj.reserve();\n * obj.unreserve(seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class SeatManager(object):\n\n    def __init__(self, n):\n        \"\"\"\n        :type n: int\n        \"\"\"\n        \n\n    def reserve(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n    def unreserve(self, seatNumber):\n        \"\"\"\n        :type seatNumber: int\n        :rtype: None\n        \"\"\"\n        \n\n\n# Your SeatManager object will be instantiated and called as such:\n# obj = SeatManager(n)\n# param_1 = obj.reserve()\n# obj.unreserve(seatNumber)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class SeatManager:\n\n    def __init__(self, n: int):\n        \n\n    def reserve(self) -> int:\n        \n\n    def unreserve(self, seatNumber: int) -> None:\n        \n\n\n# Your SeatManager object will be instantiated and called as such:\n# obj = SeatManager(n)\n# param_1 = obj.reserve()\n# obj.unreserve(seatNumber)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} SeatManager;\n\n\nSeatManager* seatManagerCreate(int n) {\n    \n}\n\nint seatManagerReserve(SeatManager* obj) {\n  \n}\n\nvoid seatManagerUnreserve(SeatManager* obj, int seatNumber) {\n  \n}\n\nvoid seatManagerFree(SeatManager* obj) {\n    \n}\n\n/**\n * Your SeatManager struct will be instantiated and called as such:\n * SeatManager* obj = seatManagerCreate(n);\n * int param_1 = seatManagerReserve(obj);\n \n * seatManagerUnreserve(obj, seatNumber);\n \n * seatManagerFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class SeatManager {\n\n    public SeatManager(int n) {\n        \n    }\n    \n    public int Reserve() {\n        \n    }\n    \n    public void Unreserve(int seatNumber) {\n        \n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * SeatManager obj = new SeatManager(n);\n * int param_1 = obj.Reserve();\n * obj.Unreserve(seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {number} n\n */\nvar SeatManager = function(n) {\n    \n};\n\n/**\n * @return {number}\n */\nSeatManager.prototype.reserve = function() {\n    \n};\n\n/** \n * @param {number} seatNumber\n * @return {void}\n */\nSeatManager.prototype.unreserve = function(seatNumber) {\n    \n};\n\n/** \n * Your SeatManager object will be instantiated and called as such:\n * var obj = new SeatManager(n)\n * var param_1 = obj.reserve()\n * obj.unreserve(seatNumber)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class SeatManager\n\n=begin\n    :type n: Integer\n=end\n    def initialize(n)\n        \n    end\n\n\n=begin\n    :rtype: Integer\n=end\n    def reserve()\n        \n    end\n\n\n=begin\n    :type seat_number: Integer\n    :rtype: Void\n=end\n    def unreserve(seat_number)\n        \n    end\n\n\nend\n\n# Your SeatManager object will be instantiated and called as such:\n# obj = SeatManager.new(n)\n# param_1 = obj.reserve()\n# obj.unreserve(seat_number)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass SeatManager {\n\n    init(_ n: Int) {\n        \n    }\n    \n    func reserve() -> Int {\n        \n    }\n    \n    func unreserve(_ seatNumber: Int) {\n        \n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * let obj = SeatManager(n)\n * let ret_1: Int = obj.reserve()\n * obj.unreserve(seatNumber)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type SeatManager struct {\n    \n}\n\n\nfunc Constructor(n int) SeatManager {\n    \n}\n\n\nfunc (this *SeatManager) Reserve() int {\n    \n}\n\n\nfunc (this *SeatManager) Unreserve(seatNumber int)  {\n    \n}\n\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * obj := Constructor(n);\n * param_1 := obj.Reserve();\n * obj.Unreserve(seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class SeatManager(_n: Int) {\n\n    def reserve(): Int = {\n        \n    }\n\n    def unreserve(seatNumber: Int) {\n        \n    }\n\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * var obj = new SeatManager(n)\n * var param_1 = obj.reserve()\n * obj.unreserve(seatNumber)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class SeatManager(n: Int) {\n\n    fun reserve(): Int {\n        \n    }\n\n    fun unreserve(seatNumber: Int) {\n        \n    }\n\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * var obj = SeatManager(n)\n * var param_1 = obj.reserve()\n * obj.unreserve(seatNumber)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct SeatManager {\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 SeatManager {\n\n    fn new(n: i32) -> Self {\n        \n    }\n    \n    fn reserve(&self) -> i32 {\n        \n    }\n    \n    fn unreserve(&self, seat_number: i32) {\n        \n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * let obj = SeatManager::new(n);\n * let ret_1: i32 = obj.reserve();\n * obj.unreserve(seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class SeatManager {\n    /**\n     * @param Integer $n\n     */\n    function __construct($n) {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function reserve() {\n        \n    }\n  \n    /**\n     * @param Integer $seatNumber\n     * @return NULL\n     */\n    function unreserve($seatNumber) {\n        \n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * $obj = SeatManager($n);\n * $ret_1 = $obj->reserve();\n * $obj->unreserve($seatNumber);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class SeatManager {\n    constructor(n: number) {\n\n    }\n\n    reserve(): number {\n\n    }\n\n    unreserve(seatNumber: number): void {\n\n    }\n}\n\n/**\n * Your SeatManager object will be instantiated and called as such:\n * var obj = new SeatManager(n)\n * var param_1 = obj.reserve()\n * obj.unreserve(seatNumber)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define seat-manager%\n  (class object%\n    (super-new)\n\n    ; n : exact-integer?\n    (init-field\n      n)\n    \n    ; reserve : -> exact-integer?\n    (define/public (reserve)\n\n      )\n    ; unreserve : exact-integer? -> void?\n    (define/public (unreserve seat-number)\n\n      )))\n\n;; Your seat-manager% object will be instantiated and called as such:\n;; (define obj (new seat-manager% [n n]))\n;; (define param_1 (send obj reserve))\n;; (send obj unreserve seat-number)",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec seat_manager_init_(N :: integer()) -> any().\nseat_manager_init_(N) ->\n  .\n\n-spec seat_manager_reserve() -> integer().\nseat_manager_reserve() ->\n  .\n\n-spec seat_manager_unreserve(SeatNumber :: integer()) -> any().\nseat_manager_unreserve(SeatNumber) ->\n  .\n\n\n%% Your functions will be called as such:\n%% seat_manager_init_(N),\n%% Param_1 = seat_manager_reserve(),\n%% seat_manager_unreserve(SeatNumber),\n\n%% seat_manager_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 SeatManager do\n  @spec init_(n :: integer) :: any\n  def init_(n) do\n\n  end\n\n  @spec reserve() :: integer\n  def reserve() do\n\n  end\n\n  @spec unreserve(seat_number :: integer) :: any\n  def unreserve(seat_number) do\n\n  end\nend\n\n# Your functions will be called as such:\n# SeatManager.init_(n)\n# param_1 = SeatManager.reserve()\n# SeatManager.unreserve(seat_number)\n\n# SeatManager.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "hints": [
                "You need a data structure that maintains the states of the seats. This data structure should also allow you to get the first available seat and flip the state of a seat in a reasonable time.",
                "You can let the data structure contain the available seats. Then you want to be able to get the lowest element and erase an element, in a reasonable time.",
                "Ordered sets support these operations."
            ],
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            "sampleTestCase": "[\"SeatManager\",\"reserve\",\"reserve\",\"unreserve\",\"reserve\",\"reserve\",\"reserve\",\"reserve\",\"unreserve\"]\n[[5],[],[],[2],[],[],[],[],[5]]",
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