mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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199 lines
27 KiB
JSON
199 lines
27 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1249",
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"questionFrontendId": "1146",
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"boundTopicId": null,
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"title": "Snapshot Array",
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"titleSlug": "snapshot-array",
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"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. <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> 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> 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> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> ["SnapshotArray","set","snap","set","get"]\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> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>0 <= index < length</code></li>\n\t<li><code>0 <= val <= 10<sup>9</sup></code></li>\n\t<li><code>0 <= snap_id < </code>(the total number of times we call <code>snap()</code>)</li>\n\t<li>At most <code>5 * 10<sup>4</sup></code> calls will be made to <code>set</code>, <code>snap</code>, and <code>get</code>.</li>\n</ul>\n",
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"translatedTitle": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 3601,
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"exampleTestcases": "[\"SnapshotArray\",\"set\",\"snap\",\"set\",\"get\"]\n[[3],[0,5],[],[0,6],[0,0]]",
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"categoryTitle": "Algorithms",
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"contributors": [],
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"topicTags": [
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{
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"name": "Array",
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"name": "Hash Table",
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"slug": "hash-table",
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},
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"name": "Binary Search",
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"slug": "binary-search",
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"name": "Design",
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{
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"lang": "C++",
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"langSlug": "cpp",
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"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 */",
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{
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"lang": "Java",
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"langSlug": "java",
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"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 */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Python",
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"langSlug": "python",
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"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)",
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"__typename": "CodeSnippetNode"
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"lang": "Python3",
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"langSlug": "python3",
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"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)",
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"__typename": "CodeSnippetNode"
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{
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"lang": "C",
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"langSlug": "c",
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"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*/",
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{
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"lang": "C#",
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"langSlug": "csharp",
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"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 */",
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"__typename": "CodeSnippetNode"
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"lang": "JavaScript",
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"langSlug": "javascript",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"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 */",
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{
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"lang": "PHP",
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"langSlug": "php",
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"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 */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Swift",
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"langSlug": "swift",
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"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 */",
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"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 */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class SnapshotArray {\n\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 = SnapshotArray(length);\n * obj.set(index,val);\n * int param2 = obj.snap();\n * int param3 = obj.get(index,snap_id);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Go",
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"langSlug": "golang",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Ruby",
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"langSlug": "ruby",
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"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)",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Scala",
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"langSlug": "scala",
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"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 */",
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"__typename": "CodeSnippetNode"
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"lang": "Rust",
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"langSlug": "rust",
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"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 */",
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"__typename": "CodeSnippetNode"
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"lang": "Racket",
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"langSlug": "racket",
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"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 ; snap : -> exact-integer?\n (define/public (snap)\n )\n ; get : exact-integer? exact-integer? -> exact-integer?\n (define/public (get index snap_id)\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))",
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"lang": "Erlang",
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"langSlug": "erlang",
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"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.",
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"lang": "Elixir",
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"langSlug": "elixir",
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"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": [
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"Use a list of lists, adding both the element and the snap_id to each index."
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],
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"sampleTestCase": "[\"SnapshotArray\",\"set\",\"snap\",\"set\",\"get\"]\n[[3],[0,5],[],[0,6],[0,0]]",
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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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