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            "questionId": "731",
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            "title": "My Calendar II",
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            "content": "<p>You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a <strong>triple booking</strong>.</p>\n\n<p>A <strong>triple booking</strong> happens when three events have some non-empty intersection (i.e., some moment is common to all the three events.).</p>\n\n<p>The event can be represented as a pair of integers <code>start</code> and <code>end</code> that represents a booking on the half-open interval <code>[start, end)</code>, the range of real numbers <code>x</code> such that <code>start &lt;= x &lt; end</code>.</p>\n\n<p>Implement the <code>MyCalendarTwo</code> class:</p>\n\n<ul>\n\t<li><code>MyCalendarTwo()</code> Initializes the calendar object.</li>\n\t<li><code>boolean book(int start, int end)</code> Returns <code>true</code> if the event can be added to the calendar successfully without causing a <strong>triple booking</strong>. Otherwise, return <code>false</code> and do not add the event to the calendar.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;MyCalendarTwo&quot;, &quot;book&quot;, &quot;book&quot;, &quot;book&quot;, &quot;book&quot;, &quot;book&quot;, &quot;book&quot;]\n[[], [10, 20], [50, 60], [10, 40], [5, 15], [5, 10], [25, 55]]\n<strong>Output</strong>\n[null, true, true, true, false, true, true]\n\n<strong>Explanation</strong>\nMyCalendarTwo myCalendarTwo = new MyCalendarTwo();\nmyCalendarTwo.book(10, 20); // return True, The event can be booked. \nmyCalendarTwo.book(50, 60); // return True, The event can be booked. \nmyCalendarTwo.book(10, 40); // return True, The event can be double booked. \nmyCalendarTwo.book(5, 15);  // return False, The event cannot be booked, because it would result in a triple booking.\nmyCalendarTwo.book(5, 10); // return True, The event can be booked, as it does not use time 10 which is already double booked.\nmyCalendarTwo.book(25, 55); // return True, The event can be booked, as the time in [25, 40) will be double booked with the third event, the time [40, 50) will be single booked, and the time [50, 55) will be double booked with the second event.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= start &lt; end &lt;= 10<sup>9</sup></code></li>\n\t<li>At most <code>1000</code> calls will be made to <code>book</code>.</li>\n</ul>\n",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class MyCalendarTwo {\npublic:\n    MyCalendarTwo() {\n        \n    }\n    \n    bool book(int start, int end) {\n        \n    }\n};\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * MyCalendarTwo* obj = new MyCalendarTwo();\n * bool param_1 = obj->book(start,end);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class MyCalendarTwo {\n\n    public MyCalendarTwo() {\n        \n    }\n    \n    public boolean book(int start, int end) {\n        \n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * MyCalendarTwo obj = new MyCalendarTwo();\n * boolean param_1 = obj.book(start,end);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class MyCalendarTwo(object):\n\n    def __init__(self):\n        \n\n    def book(self, start, end):\n        \"\"\"\n        :type start: int\n        :type end: int\n        :rtype: bool\n        \"\"\"\n        \n\n\n# Your MyCalendarTwo object will be instantiated and called as such:\n# obj = MyCalendarTwo()\n# param_1 = obj.book(start,end)",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class MyCalendarTwo:\n\n    def __init__(self):\n        \n\n    def book(self, start: int, end: int) -> bool:\n        \n\n\n# Your MyCalendarTwo object will be instantiated and called as such:\n# obj = MyCalendarTwo()\n# param_1 = obj.book(start,end)",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} MyCalendarTwo;\n\n\nMyCalendarTwo* myCalendarTwoCreate() {\n    \n}\n\nbool myCalendarTwoBook(MyCalendarTwo* obj, int start, int end) {\n  \n}\n\nvoid myCalendarTwoFree(MyCalendarTwo* obj) {\n    \n}\n\n/**\n * Your MyCalendarTwo struct will be instantiated and called as such:\n * MyCalendarTwo* obj = myCalendarTwoCreate();\n * bool param_1 = myCalendarTwoBook(obj, start, end);\n \n * myCalendarTwoFree(obj);\n*/",
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class MyCalendarTwo {\n\n    public MyCalendarTwo() {\n        \n    }\n    \n    public bool Book(int start, int end) {\n        \n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * MyCalendarTwo obj = new MyCalendarTwo();\n * bool param_1 = obj.Book(start,end);\n */",
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                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar MyCalendarTwo = function() {\n    \n};\n\n/** \n * @param {number} start \n * @param {number} end\n * @return {boolean}\n */\nMyCalendarTwo.prototype.book = function(start, end) {\n    \n};\n\n/** \n * Your MyCalendarTwo object will be instantiated and called as such:\n * var obj = new MyCalendarTwo()\n * var param_1 = obj.book(start,end)\n */",
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                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class MyCalendarTwo\n    def initialize()\n        \n    end\n\n\n=begin\n    :type start: Integer\n    :type end: Integer\n    :rtype: Boolean\n=end\n    def book(start, end)\n        \n    end\n\n\nend\n\n# Your MyCalendarTwo object will be instantiated and called as such:\n# obj = MyCalendarTwo.new()\n# param_1 = obj.book(start, end)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass MyCalendarTwo {\n\n    init() {\n        \n    }\n    \n    func book(_ start: Int, _ end: Int) -> Bool {\n        \n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * let obj = MyCalendarTwo()\n * let ret_1: Bool = obj.book(start, end)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type MyCalendarTwo struct {\n    \n}\n\n\nfunc Constructor() MyCalendarTwo {\n    \n}\n\n\nfunc (this *MyCalendarTwo) Book(start int, end int) bool {\n    \n}\n\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * obj := Constructor();\n * param_1 := obj.Book(start,end);\n */",
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                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class MyCalendarTwo() {\n\n    def book(start: Int, end: Int): Boolean = {\n        \n    }\n\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * var obj = new MyCalendarTwo()\n * var param_1 = obj.book(start,end)\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class MyCalendarTwo() {\n\n    fun book(start: Int, end: Int): Boolean {\n        \n    }\n\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * var obj = MyCalendarTwo()\n * var param_1 = obj.book(start,end)\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct MyCalendarTwo {\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 MyCalendarTwo {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn book(&self, start: i32, end: i32) -> bool {\n        \n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * let obj = MyCalendarTwo::new();\n * let ret_1: bool = obj.book(start, end);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class MyCalendarTwo {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $start\n     * @param Integer $end\n     * @return Boolean\n     */\n    function book($start, $end) {\n        \n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * $obj = MyCalendarTwo();\n * $ret_1 = $obj->book($start, $end);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class MyCalendarTwo {\n    constructor() {\n\n    }\n\n    book(start: number, end: number): boolean {\n\n    }\n}\n\n/**\n * Your MyCalendarTwo object will be instantiated and called as such:\n * var obj = new MyCalendarTwo()\n * var param_1 = obj.book(start,end)\n */",
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                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define my-calendar-two%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; book : exact-integer? exact-integer? -> boolean?\n    (define/public (book start end)\n\n      )))\n\n;; Your my-calendar-two% object will be instantiated and called as such:\n;; (define obj (new my-calendar-two%))\n;; (define param_1 (send obj book start end))",
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                    "lang": "Erlang",
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                    "code": "-spec my_calendar_two_init_() -> any().\nmy_calendar_two_init_() ->\n  .\n\n-spec my_calendar_two_book(Start :: integer(), End :: integer()) -> boolean().\nmy_calendar_two_book(Start, End) ->\n  .\n\n\n%% Your functions will be called as such:\n%% my_calendar_two_init_(),\n%% Param_1 = my_calendar_two_book(Start, End),\n\n%% my_calendar_two_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 MyCalendarTwo do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec book(start :: integer, end :: integer) :: boolean\n  def book(start, end) do\n\n  end\nend\n\n# Your functions will be called as such:\n# MyCalendarTwo.init_()\n# param_1 = MyCalendarTwo.book(start, end)\n\n# MyCalendarTwo.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "hints": [
                "Store two sorted lists of intervals: one list will be all times that are at least single booked, and another list will be all times that are definitely double booked.  If none of the double bookings conflict, then the booking will succeed, and you should update your single and double bookings accordingly."
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            "sampleTestCase": "[\"MyCalendarTwo\",\"book\",\"book\",\"book\",\"book\",\"book\",\"book\"]\n[[],[10,20],[50,60],[10,40],[5,15],[5,10],[25,55]]",
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