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    "data": {
        "question": {
            "questionId": "1249",
            "questionFrontendId": "1146",
            "boundTopicId": null,
            "title": "Snapshot Array",
            "titleSlug": "snapshot-array",
            "content": "<p>Implement a SnapshotArray that supports the following interface:</p>\n\n<ul>\n\t<li><code>SnapshotArray(int length)</code> initializes an array-like data structure with the given length.&nbsp; <strong>Initially, each element equals 0</strong>.</li>\n\t<li><code>void set(index, val)</code> sets the element at the given <code>index</code> to be equal to <code>val</code>.</li>\n\t<li><code>int snap()</code>&nbsp;takes a snapshot of the array and returns the <code>snap_id</code>: the total number of times we called <code>snap()</code> minus <code>1</code>.</li>\n\t<li><code>int get(index, snap_id)</code>&nbsp;returns the value at the given <code>index</code>, at the time we took the snapshot with the given <code>snap_id</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> [&quot;SnapshotArray&quot;,&quot;set&quot;,&quot;snap&quot;,&quot;set&quot;,&quot;get&quot;]\n[[3],[0,5],[],[0,6],[0,0]]\n<strong>Output:</strong> [null,null,0,null,5]\n<strong>Explanation: </strong>\nSnapshotArray snapshotArr = new SnapshotArray(3); // set the length to be 3\nsnapshotArr.set(0,5);  // Set array[0] = 5\nsnapshotArr.snap();  // Take a snapshot, return snap_id = 0\nsnapshotArr.set(0,6);\nsnapshotArr.get(0,0);  // Get the value of array[0] with snap_id = 0, return 5</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= length&nbsp;&lt;= 50000</code></li>\n\t<li>At most <code>50000</code>&nbsp;calls will be made to <code>set</code>, <code>snap</code>, and <code>get</code>.</li>\n\t<li><code>0 &lt;= index&nbsp;&lt;&nbsp;length</code></li>\n\t<li><code>0 &lt;=&nbsp;snap_id &lt;&nbsp;</code>(the total number of times we call <code>snap()</code>)</li>\n\t<li><code>0 &lt;=&nbsp;val &lt;= 10^9</code></li>\n</ul>\n",
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            "exampleTestcases": "[\"SnapshotArray\",\"set\",\"snap\",\"set\",\"get\"]\n[[3],[0,5],[],[0,6],[0,0]]",
            "categoryTitle": "Algorithms",
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            "codeSnippets": [
                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class SnapshotArray {\npublic:\n    SnapshotArray(int length) {\n        \n    }\n    \n    void set(int index, int val) {\n        \n    }\n    \n    int snap() {\n        \n    }\n    \n    int get(int index, int snap_id) {\n        \n    }\n};\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * SnapshotArray* obj = new SnapshotArray(length);\n * obj->set(index,val);\n * int param_2 = obj->snap();\n * int param_3 = obj->get(index,snap_id);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class SnapshotArray {\n\n    public SnapshotArray(int length) {\n        \n    }\n    \n    public void set(int index, int val) {\n        \n    }\n    \n    public int snap() {\n        \n    }\n    \n    public int get(int index, int snap_id) {\n        \n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * SnapshotArray obj = new SnapshotArray(length);\n * obj.set(index,val);\n * int param_2 = obj.snap();\n * int param_3 = obj.get(index,snap_id);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class SnapshotArray(object):\n\n    def __init__(self, length):\n        \"\"\"\n        :type length: int\n        \"\"\"\n        \n\n    def set(self, index, val):\n        \"\"\"\n        :type index: int\n        :type val: int\n        :rtype: None\n        \"\"\"\n        \n\n    def snap(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n    def get(self, index, snap_id):\n        \"\"\"\n        :type index: int\n        :type snap_id: int\n        :rtype: int\n        \"\"\"\n        \n\n\n# Your SnapshotArray object will be instantiated and called as such:\n# obj = SnapshotArray(length)\n# obj.set(index,val)\n# param_2 = obj.snap()\n# param_3 = obj.get(index,snap_id)",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class SnapshotArray:\n\n    def __init__(self, length: int):\n        \n\n    def set(self, index: int, val: int) -> None:\n        \n\n    def snap(self) -> int:\n        \n\n    def get(self, index: int, snap_id: int) -> int:\n        \n\n\n# Your SnapshotArray object will be instantiated and called as such:\n# obj = SnapshotArray(length)\n# obj.set(index,val)\n# param_2 = obj.snap()\n# param_3 = obj.get(index,snap_id)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} SnapshotArray;\n\n\nSnapshotArray* snapshotArrayCreate(int length) {\n    \n}\n\nvoid snapshotArraySet(SnapshotArray* obj, int index, int val) {\n  \n}\n\nint snapshotArraySnap(SnapshotArray* obj) {\n  \n}\n\nint snapshotArrayGet(SnapshotArray* obj, int index, int snap_id) {\n  \n}\n\nvoid snapshotArrayFree(SnapshotArray* obj) {\n    \n}\n\n/**\n * Your SnapshotArray struct will be instantiated and called as such:\n * SnapshotArray* obj = snapshotArrayCreate(length);\n * snapshotArraySet(obj, index, val);\n \n * int param_2 = snapshotArraySnap(obj);\n \n * int param_3 = snapshotArrayGet(obj, index, snap_id);\n \n * snapshotArrayFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class SnapshotArray {\n\n    public SnapshotArray(int length) {\n        \n    }\n    \n    public void Set(int index, int val) {\n        \n    }\n    \n    public int Snap() {\n        \n    }\n    \n    public int Get(int index, int snap_id) {\n        \n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * SnapshotArray obj = new SnapshotArray(length);\n * obj.Set(index,val);\n * int param_2 = obj.Snap();\n * int param_3 = obj.Get(index,snap_id);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {number} length\n */\nvar SnapshotArray = function(length) {\n    \n};\n\n/** \n * @param {number} index \n * @param {number} val\n * @return {void}\n */\nSnapshotArray.prototype.set = function(index, val) {\n    \n};\n\n/**\n * @return {number}\n */\nSnapshotArray.prototype.snap = function() {\n    \n};\n\n/** \n * @param {number} index \n * @param {number} snap_id\n * @return {number}\n */\nSnapshotArray.prototype.get = function(index, snap_id) {\n    \n};\n\n/** \n * Your SnapshotArray object will be instantiated and called as such:\n * var obj = new SnapshotArray(length)\n * obj.set(index,val)\n * var param_2 = obj.snap()\n * var param_3 = obj.get(index,snap_id)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class SnapshotArray\n\n=begin\n    :type length: Integer\n=end\n    def initialize(length)\n        \n    end\n\n\n=begin\n    :type index: Integer\n    :type val: Integer\n    :rtype: Void\n=end\n    def set(index, val)\n        \n    end\n\n\n=begin\n    :rtype: Integer\n=end\n    def snap()\n        \n    end\n\n\n=begin\n    :type index: Integer\n    :type snap_id: Integer\n    :rtype: Integer\n=end\n    def get(index, snap_id)\n        \n    end\n\n\nend\n\n# Your SnapshotArray object will be instantiated and called as such:\n# obj = SnapshotArray.new(length)\n# obj.set(index, val)\n# param_2 = obj.snap()\n# param_3 = obj.get(index, snap_id)",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass SnapshotArray {\n\n    init(_ length: Int) {\n        \n    }\n    \n    func set(_ index: Int, _ val: Int) {\n        \n    }\n    \n    func snap() -> Int {\n        \n    }\n    \n    func get(_ index: Int, _ snap_id: Int) -> Int {\n        \n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * let obj = SnapshotArray(length)\n * obj.set(index, val)\n * let ret_2: Int = obj.snap()\n * let ret_3: Int = obj.get(index, snap_id)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type SnapshotArray struct {\n    \n}\n\n\nfunc Constructor(length int) SnapshotArray {\n    \n}\n\n\nfunc (this *SnapshotArray) Set(index int, val int)  {\n    \n}\n\n\nfunc (this *SnapshotArray) Snap() int {\n    \n}\n\n\nfunc (this *SnapshotArray) Get(index int, snap_id int) int {\n    \n}\n\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * obj := Constructor(length);\n * obj.Set(index,val);\n * param_2 := obj.Snap();\n * param_3 := obj.Get(index,snap_id);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class SnapshotArray(_length: Int) {\n\n    def set(index: Int, `val`: Int) {\n        \n    }\n\n    def snap(): Int = {\n        \n    }\n\n    def get(index: Int, snap_id: Int): Int = {\n        \n    }\n\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * var obj = new SnapshotArray(length)\n * obj.set(index,`val`)\n * var param_2 = obj.snap()\n * var param_3 = obj.get(index,snap_id)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class SnapshotArray(length: Int) {\n\n    fun set(index: Int, `val`: Int) {\n        \n    }\n\n    fun snap(): Int {\n        \n    }\n\n    fun get(index: Int, snap_id: Int): Int {\n        \n    }\n\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * var obj = SnapshotArray(length)\n * obj.set(index,`val`)\n * var param_2 = obj.snap()\n * var param_3 = obj.get(index,snap_id)\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct SnapshotArray {\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 SnapshotArray {\n\n    fn new(length: i32) -> Self {\n        \n    }\n    \n    fn set(&self, index: i32, val: i32) {\n        \n    }\n    \n    fn snap(&self) -> i32 {\n        \n    }\n    \n    fn get(&self, index: i32, snap_id: i32) -> i32 {\n        \n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * let obj = SnapshotArray::new(length);\n * obj.set(index, val);\n * let ret_2: i32 = obj.snap();\n * let ret_3: i32 = obj.get(index, snap_id);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class SnapshotArray {\n    /**\n     * @param Integer $length\n     */\n    function __construct($length) {\n        \n    }\n  \n    /**\n     * @param Integer $index\n     * @param Integer $val\n     * @return NULL\n     */\n    function set($index, $val) {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function snap() {\n        \n    }\n  \n    /**\n     * @param Integer $index\n     * @param Integer $snap_id\n     * @return Integer\n     */\n    function get($index, $snap_id) {\n        \n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * $obj = SnapshotArray($length);\n * $obj->set($index, $val);\n * $ret_2 = $obj->snap();\n * $ret_3 = $obj->get($index, $snap_id);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class SnapshotArray {\n    constructor(length: number) {\n\n    }\n\n    set(index: number, val: number): void {\n\n    }\n\n    snap(): number {\n\n    }\n\n    get(index: number, snap_id: number): number {\n\n    }\n}\n\n/**\n * Your SnapshotArray object will be instantiated and called as such:\n * var obj = new SnapshotArray(length)\n * obj.set(index,val)\n * var param_2 = obj.snap()\n * var param_3 = obj.get(index,snap_id)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define snapshot-array%\n  (class object%\n    (super-new)\n\n    ; length : exact-integer?\n    (init-field\n      length)\n    \n    ; set : exact-integer? exact-integer? -> void?\n    (define/public (set index val)\n\n      )\n    ; snap : -> exact-integer?\n    (define/public (snap)\n\n      )\n    ; get : exact-integer? exact-integer? -> exact-integer?\n    (define/public (get index snap_id)\n\n      )))\n\n;; Your snapshot-array% object will be instantiated and called as such:\n;; (define obj (new snapshot-array% [length length]))\n;; (send obj set index val)\n;; (define param_2 (send obj snap))\n;; (define param_3 (send obj get index snap_id))",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec snapshot_array_init_(Length :: integer()) -> any().\nsnapshot_array_init_(Length) ->\n  .\n\n-spec snapshot_array_set(Index :: integer(), Val :: integer()) -> any().\nsnapshot_array_set(Index, Val) ->\n  .\n\n-spec snapshot_array_snap() -> integer().\nsnapshot_array_snap() ->\n  .\n\n-spec snapshot_array_get(Index :: integer(), Snap_id :: integer()) -> integer().\nsnapshot_array_get(Index, Snap_id) ->\n  .\n\n\n%% Your functions will be called as such:\n%% snapshot_array_init_(Length),\n%% snapshot_array_set(Index, Val),\n%% Param_2 = snapshot_array_snap(),\n%% Param_3 = snapshot_array_get(Index, Snap_id),\n\n%% snapshot_array_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 SnapshotArray do\n  @spec init_(length :: integer) :: any\n  def init_(length) do\n\n  end\n\n  @spec set(index :: integer, val :: integer) :: any\n  def set(index, val) do\n\n  end\n\n  @spec snap() :: integer\n  def snap() do\n\n  end\n\n  @spec get(index :: integer, snap_id :: integer) :: integer\n  def get(index, snap_id) do\n\n  end\nend\n\n# Your functions will be called as such:\n# SnapshotArray.init_(length)\n# SnapshotArray.set(index, val)\n# param_2 = SnapshotArray.snap()\n# param_3 = SnapshotArray.get(index, snap_id)\n\n# SnapshotArray.init_ will be called before every test case, in which you can do some necessary initializations.",
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            "hints": [
                "Use a list of lists, adding both the element and the snap_id to each index."
            ],
            "solution": null,
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            "sampleTestCase": "[\"SnapshotArray\",\"set\",\"snap\",\"set\",\"get\"]\n[[3],[0,5],[],[0,6],[0,0]]",
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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>. 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 1.3.10</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 4.5.4, 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 ES2020 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 24.2\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.0 with Erlang/OTP 24.2\"]}",
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