mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
22 KiB
JSON
186 lines
22 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "384",
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"questionFrontendId": "384",
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"boundTopicId": null,
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"title": "Shuffle an Array",
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"titleSlug": "shuffle-an-array",
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"content": "<p>Given an integer array <code>nums</code>, design an algorithm to randomly shuffle the array. All permutations of the array should be <strong>equally likely</strong> as a result of the shuffling.</p>\n\n<p>Implement the <code>Solution</code> class:</p>\n\n<ul>\n\t<li><code>Solution(int[] nums)</code> Initializes the object with the integer array <code>nums</code>.</li>\n\t<li><code>int[] reset()</code> Resets the array to its original configuration and returns it.</li>\n\t<li><code>int[] shuffle()</code> Returns a random shuffling of the array.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["Solution", "shuffle", "reset", "shuffle"]\n[[[1, 2, 3]], [], [], []]\n<strong>Output</strong>\n[null, [3, 1, 2], [1, 2, 3], [1, 3, 2]]\n\n<strong>Explanation</strong>\nSolution solution = new Solution([1, 2, 3]);\nsolution.shuffle(); // Shuffle the array [1,2,3] and return its result.\n // Any permutation of [1,2,3] must be equally likely to be returned.\n // Example: return [3, 1, 2]\nsolution.reset(); // Resets the array back to its original configuration [1,2,3]. Return [1, 2, 3]\nsolution.shuffle(); // Returns the random shuffling of array [1,2,3]. Example: return [1, 3, 2]\n\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 50</code></li>\n\t<li><code>-10<sup>6</sup> <= nums[i] <= 10<sup>6</sup></code></li>\n\t<li>All the elements of <code>nums</code> are <strong>unique</strong>.</li>\n\t<li>At most <code>10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>reset</code> and <code>shuffle</code>.</li>\n</ul>\n",
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"difficulty": "Medium",
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"likes": 1305,
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"exampleTestcases": "[\"Solution\",\"shuffle\",\"reset\",\"shuffle\"]\n[[[1,2,3]],[],[],[]]",
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"categoryTitle": "Algorithms",
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"name": "Array",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Solution {\npublic:\n Solution(vector<int>& nums) {\n \n }\n \n vector<int> reset() {\n \n }\n \n vector<int> shuffle() {\n \n }\n};\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution* obj = new Solution(nums);\n * vector<int> param_1 = obj->reset();\n * vector<int> param_2 = obj->shuffle();\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "class Solution {\n\n public Solution(int[] nums) {\n \n }\n \n public int[] reset() {\n \n }\n \n public int[] shuffle() {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution obj = new Solution(nums);\n * int[] param_1 = obj.reset();\n * int[] param_2 = obj.shuffle();\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 Solution(object):\n\n def __init__(self, nums):\n \"\"\"\n :type nums: List[int]\n \"\"\"\n \n\n def reset(self):\n \"\"\"\n :rtype: List[int]\n \"\"\"\n \n\n def shuffle(self):\n \"\"\"\n :rtype: List[int]\n \"\"\"\n \n\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution(nums)\n# param_1 = obj.reset()\n# param_2 = obj.shuffle()",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python3",
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"langSlug": "python3",
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"code": "class Solution:\n\n def __init__(self, nums: List[int]):\n \n\n def reset(self) -> List[int]:\n \n\n def shuffle(self) -> List[int]:\n \n\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution(nums)\n# param_1 = obj.reset()\n# param_2 = obj.shuffle()",
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"__typename": "CodeSnippetNode"
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"lang": "C",
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"langSlug": "c",
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"code": "\n\n\ntypedef struct {\n \n} Solution;\n\n\nSolution* solutionCreate(int* nums, int numsSize) {\n \n}\n\nint* solutionReset(Solution* obj, int* retSize) {\n \n}\n\nint* solutionShuffle(Solution* obj, int* retSize) {\n \n}\n\nvoid solutionFree(Solution* obj) {\n \n}\n\n/**\n * Your Solution struct will be instantiated and called as such:\n * Solution* obj = solutionCreate(nums, numsSize);\n * int* param_1 = solutionReset(obj, retSize);\n \n * int* param_2 = solutionShuffle(obj, retSize);\n \n * solutionFree(obj);\n*/",
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Solution {\n\n public Solution(int[] nums) {\n \n }\n \n public int[] Reset() {\n \n }\n \n public int[] Shuffle() {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution obj = new Solution(nums);\n * int[] param_1 = obj.Reset();\n * int[] param_2 = obj.Shuffle();\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {number[]} nums\n */\nvar Solution = function(nums) {\n \n};\n\n/**\n * @return {number[]}\n */\nSolution.prototype.reset = function() {\n \n};\n\n/**\n * @return {number[]}\n */\nSolution.prototype.shuffle = function() {\n \n};\n\n/** \n * Your Solution object will be instantiated and called as such:\n * var obj = new Solution(nums)\n * var param_1 = obj.reset()\n * var param_2 = obj.shuffle()\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "class Solution {\n constructor(nums: number[]) {\n \n }\n\n reset(): number[] {\n \n }\n\n shuffle(): number[] {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = new Solution(nums)\n * var param_1 = obj.reset()\n * var param_2 = obj.shuffle()\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Solution {\n /**\n * @param Integer[] $nums\n */\n function __construct($nums) {\n \n }\n \n /**\n * @return Integer[]\n */\n function reset() {\n \n }\n \n /**\n * @return Integer[]\n */\n function shuffle() {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * $obj = Solution($nums);\n * $ret_1 = $obj->reset();\n * $ret_2 = $obj->shuffle();\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 Solution {\n\n init(_ nums: [Int]) {\n \n }\n \n func reset() -> [Int] {\n \n }\n \n func shuffle() -> [Int] {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * let obj = Solution(nums)\n * let ret_1: [Int] = obj.reset()\n * let ret_2: [Int] = obj.shuffle()\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution(nums: IntArray) {\n\n fun reset(): IntArray {\n \n }\n\n fun shuffle(): IntArray {\n \n }\n\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = Solution(nums)\n * var param_1 = obj.reset()\n * var param_2 = obj.shuffle()\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 Solution {\n\n Solution(List<int> nums) {\n \n }\n \n List<int> reset() {\n \n }\n \n List<int> shuffle() {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution obj = Solution(nums);\n * List<int> param1 = obj.reset();\n * List<int> param2 = obj.shuffle();\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 Solution struct {\n \n}\n\n\nfunc Constructor(nums []int) Solution {\n \n}\n\n\nfunc (this *Solution) Reset() []int {\n \n}\n\n\nfunc (this *Solution) Shuffle() []int {\n \n}\n\n\n/**\n * Your Solution object will be instantiated and called as such:\n * obj := Constructor(nums);\n * param_1 := obj.Reset();\n * param_2 := obj.Shuffle();\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class Solution\n\n=begin\n :type nums: Integer[]\n=end\n def initialize(nums)\n \n end\n\n\n=begin\n :rtype: Integer[]\n=end\n def reset()\n \n end\n\n\n=begin\n :rtype: Integer[]\n=end\n def shuffle()\n \n end\n\n\nend\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution.new(nums)\n# param_1 = obj.reset()\n# param_2 = obj.shuffle()",
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"__typename": "CodeSnippetNode"
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"lang": "Scala",
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"langSlug": "scala",
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"code": "class Solution(_nums: Array[Int]) {\n\n def reset(): Array[Int] = {\n \n }\n\n def shuffle(): Array[Int] = {\n \n }\n\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = new Solution(nums)\n * var param_1 = obj.reset()\n * var param_2 = obj.shuffle()\n */",
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"lang": "Rust",
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"langSlug": "rust",
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"code": "struct Solution {\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 Solution {\n\n fn new(nums: Vec<i32>) -> Self {\n \n }\n \n fn reset(&self) -> Vec<i32> {\n \n }\n \n fn shuffle(&self) -> Vec<i32> {\n \n }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * let obj = Solution::new(nums);\n * let ret_1: Vec<i32> = obj.reset();\n * let ret_2: Vec<i32> = obj.shuffle();\n */",
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"lang": "Racket",
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"code": "(define solution%\n (class object%\n (super-new)\n \n ; nums : (listof exact-integer?)\n (init-field\n nums)\n \n ; reset : -> (listof exact-integer?)\n (define/public (reset)\n )\n ; shuffle : -> (listof exact-integer?)\n (define/public (shuffle)\n )))\n\n;; Your solution% object will be instantiated and called as such:\n;; (define obj (new solution% [nums nums]))\n;; (define param_1 (send obj reset))\n;; (define param_2 (send obj shuffle))",
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"code": "-spec solution_init_(Nums :: [integer()]) -> any().\nsolution_init_(Nums) ->\n .\n\n-spec solution_reset() -> [integer()].\nsolution_reset() ->\n .\n\n-spec solution_shuffle() -> [integer()].\nsolution_shuffle() ->\n .\n\n\n%% Your functions will be called as such:\n%% solution_init_(Nums),\n%% Param_1 = solution_reset(),\n%% Param_2 = solution_shuffle(),\n\n%% solution_init_ will be called before every test case, in which you can do some necessary initializations.",
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"code": "defmodule Solution do\n @spec init_(nums :: [integer]) :: any\n def init_(nums) do\n \n end\n\n @spec reset() :: [integer]\n def reset() do\n \n end\n\n @spec shuffle() :: [integer]\n def shuffle() do\n \n end\nend\n\n# Your functions will be called as such:\n# Solution.init_(nums)\n# param_1 = Solution.reset()\n# param_2 = Solution.shuffle()\n\n# Solution.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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"The solution expects that we always use the original array to shuffle() else some of the test cases fail. (Credits; @snehasingh31)"
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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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