mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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184 lines
25 KiB
JSON
184 lines
25 KiB
JSON
{
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"question": {
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"questionId": "208",
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"questionFrontendId": "208",
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"title": "Implement Trie (Prefix Tree)",
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"titleSlug": "implement-trie-prefix-tree",
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"content": "<p>A <a href=\"https://en.wikipedia.org/wiki/Trie\" target=\"_blank\"><strong>trie</strong></a> (pronounced as "try") or <strong>prefix tree</strong> is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various applications of this data structure, such as autocomplete and spellchecker.</p>\n\n<p>Implement the Trie class:</p>\n\n<ul>\n\t<li><code>Trie()</code> Initializes the trie object.</li>\n\t<li><code>void insert(String word)</code> Inserts the string <code>word</code> into the trie.</li>\n\t<li><code>boolean search(String word)</code> Returns <code>true</code> if the string <code>word</code> is in the trie (i.e., was inserted before), and <code>false</code> otherwise.</li>\n\t<li><code>boolean startsWith(String prefix)</code> Returns <code>true</code> if there is a previously inserted string <code>word</code> that has the prefix <code>prefix</code>, and <code>false</code> otherwise.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["Trie", "insert", "search", "search", "startsWith", "insert", "search"]\n[[], ["apple"], ["apple"], ["app"], ["app"], ["app"], ["app"]]\n<strong>Output</strong>\n[null, null, true, false, true, null, true]\n\n<strong>Explanation</strong>\nTrie trie = new Trie();\ntrie.insert("apple");\ntrie.search("apple"); // return True\ntrie.search("app"); // return False\ntrie.startsWith("app"); // return True\ntrie.insert("app");\ntrie.search("app"); // return True\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= word.length, prefix.length <= 2000</code></li>\n\t<li><code>word</code> and <code>prefix</code> consist only of lowercase English letters.</li>\n\t<li>At most <code>3 * 10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>insert</code>, <code>search</code>, and <code>startsWith</code>.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "[\"Trie\",\"insert\",\"search\",\"search\",\"startsWith\",\"insert\",\"search\"]\n[[],[\"apple\"],[\"apple\"],[\"app\"],[\"app\"],[\"app\"],[\"app\"]]",
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"categoryTitle": "Algorithms",
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"name": "Hash Table",
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"name": "Trie",
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{
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Trie {\npublic:\n Trie() {\n \n }\n \n void insert(string word) {\n \n }\n \n bool search(string word) {\n \n }\n \n bool startsWith(string prefix) {\n \n }\n};\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie* obj = new Trie();\n * obj->insert(word);\n * bool param_2 = obj->search(word);\n * bool param_3 = obj->startsWith(prefix);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "class Trie {\n\n public Trie() {\n \n }\n \n public void insert(String word) {\n \n }\n \n public boolean search(String word) {\n \n }\n \n public boolean startsWith(String prefix) {\n \n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie obj = new Trie();\n * obj.insert(word);\n * boolean param_2 = obj.search(word);\n * boolean param_3 = obj.startsWith(prefix);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python",
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"langSlug": "python",
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"code": "class Trie(object):\n\n def __init__(self):\n \n\n def insert(self, word):\n \"\"\"\n :type word: str\n :rtype: None\n \"\"\"\n \n\n def search(self, word):\n \"\"\"\n :type word: str\n :rtype: bool\n \"\"\"\n \n\n def startsWith(self, prefix):\n \"\"\"\n :type prefix: str\n :rtype: bool\n \"\"\"\n \n\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.startsWith(prefix)",
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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 Trie:\n\n def __init__(self):\n \n\n def insert(self, word: str) -> None:\n \n\n def search(self, word: str) -> bool:\n \n\n def startsWith(self, prefix: str) -> bool:\n \n\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.startsWith(prefix)",
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"__typename": "CodeSnippetNode"
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},
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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} Trie;\n\n\nTrie* trieCreate() {\n \n}\n\nvoid trieInsert(Trie* obj, char * word) {\n \n}\n\nbool trieSearch(Trie* obj, char * word) {\n \n}\n\nbool trieStartsWith(Trie* obj, char * prefix) {\n \n}\n\nvoid trieFree(Trie* obj) {\n \n}\n\n/**\n * Your Trie struct will be instantiated and called as such:\n * Trie* obj = trieCreate();\n * trieInsert(obj, word);\n \n * bool param_2 = trieSearch(obj, word);\n \n * bool param_3 = trieStartsWith(obj, prefix);\n \n * trieFree(obj);\n*/",
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"__typename": "CodeSnippetNode"
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{
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Trie {\n\n public Trie() {\n \n }\n \n public void Insert(string word) {\n \n }\n \n public bool Search(string word) {\n \n }\n \n public bool StartsWith(string prefix) {\n \n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * Trie obj = new Trie();\n * obj.Insert(word);\n * bool param_2 = obj.Search(word);\n * bool param_3 = obj.StartsWith(prefix);\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": "\nvar Trie = function() {\n \n};\n\n/** \n * @param {string} word\n * @return {void}\n */\nTrie.prototype.insert = function(word) {\n \n};\n\n/** \n * @param {string} word\n * @return {boolean}\n */\nTrie.prototype.search = function(word) {\n \n};\n\n/** \n * @param {string} prefix\n * @return {boolean}\n */\nTrie.prototype.startsWith = function(prefix) {\n \n};\n\n/** \n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\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 Trie\n def initialize()\n \n end\n\n\n=begin\n :type word: String\n :rtype: Void\n=end\n def insert(word)\n \n end\n\n\n=begin\n :type word: String\n :rtype: Boolean\n=end\n def search(word)\n \n end\n\n\n=begin\n :type prefix: String\n :rtype: Boolean\n=end\n def starts_with(prefix)\n \n end\n\n\nend\n\n# Your Trie object will be instantiated and called as such:\n# obj = Trie.new()\n# obj.insert(word)\n# param_2 = obj.search(word)\n# param_3 = obj.starts_with(prefix)",
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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 Trie {\n\n init() {\n \n }\n \n func insert(_ word: String) {\n \n }\n \n func search(_ word: String) -> Bool {\n \n }\n \n func startsWith(_ prefix: String) -> Bool {\n \n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * let obj = Trie()\n * obj.insert(word)\n * let ret_2: Bool = obj.search(word)\n * let ret_3: Bool = obj.startsWith(prefix)\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Go",
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"langSlug": "golang",
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"code": "type Trie struct {\n \n}\n\n\nfunc Constructor() Trie {\n \n}\n\n\nfunc (this *Trie) Insert(word string) {\n \n}\n\n\nfunc (this *Trie) Search(word string) bool {\n \n}\n\n\nfunc (this *Trie) StartsWith(prefix string) bool {\n \n}\n\n\n/**\n * Your Trie object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Insert(word);\n * param_2 := obj.Search(word);\n * param_3 := obj.StartsWith(prefix);\n */",
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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 Trie() {\n\n def insert(word: String) {\n \n }\n\n def search(word: String): Boolean = {\n \n }\n\n def startsWith(prefix: String): Boolean = {\n \n }\n\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Trie() {\n\n fun insert(word: String) {\n \n }\n\n fun search(word: String): Boolean {\n \n }\n\n fun startsWith(prefix: String): Boolean {\n \n }\n\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "struct Trie {\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 Trie {\n\n fn new() -> Self {\n \n }\n \n fn insert(&self, word: String) {\n \n }\n \n fn search(&self, word: String) -> bool {\n \n }\n \n fn starts_with(&self, prefix: String) -> bool {\n \n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * let obj = Trie::new();\n * obj.insert(word);\n * let ret_2: bool = obj.search(word);\n * let ret_3: bool = obj.starts_with(prefix);\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 Trie {\n /**\n */\n function __construct() {\n \n }\n \n /**\n * @param String $word\n * @return NULL\n */\n function insert($word) {\n \n }\n \n /**\n * @param String $word\n * @return Boolean\n */\n function search($word) {\n \n }\n \n /**\n * @param String $prefix\n * @return Boolean\n */\n function startsWith($prefix) {\n \n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * $obj = Trie();\n * $obj->insert($word);\n * $ret_2 = $obj->search($word);\n * $ret_3 = $obj->startsWith($prefix);\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 Trie {\n constructor() {\n\n }\n\n insert(word: string): void {\n\n }\n\n search(word: string): boolean {\n\n }\n\n startsWith(prefix: string): boolean {\n\n }\n}\n\n/**\n * Your Trie object will be instantiated and called as such:\n * var obj = new Trie()\n * obj.insert(word)\n * var param_2 = obj.search(word)\n * var param_3 = obj.startsWith(prefix)\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 trie%\n (class object%\n (super-new)\n (init-field)\n \n ; insert : string? -> void?\n (define/public (insert word)\n\n )\n ; search : string? -> boolean?\n (define/public (search word)\n\n )\n ; starts-with : string? -> boolean?\n (define/public (starts-with prefix)\n\n )))\n\n;; Your trie% object will be instantiated and called as such:\n;; (define obj (new trie%))\n;; (send obj insert word)\n;; (define param_2 (send obj search word))\n;; (define param_3 (send obj starts-with prefix))",
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"__typename": "CodeSnippetNode"
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec trie_init_() -> any().\ntrie_init_() ->\n .\n\n-spec trie_insert(Word :: unicode:unicode_binary()) -> any().\ntrie_insert(Word) ->\n .\n\n-spec trie_search(Word :: unicode:unicode_binary()) -> boolean().\ntrie_search(Word) ->\n .\n\n-spec trie_starts_with(Prefix :: unicode:unicode_binary()) -> boolean().\ntrie_starts_with(Prefix) ->\n .\n\n\n%% Your functions will be called as such:\n%% trie_init_(),\n%% trie_insert(Word),\n%% Param_2 = trie_search(Word),\n%% Param_3 = trie_starts_with(Prefix),\n\n%% trie_init_ will be called before every test case, in which you can do some necessary initializations.",
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"code": "defmodule Trie do\n @spec init_() :: any\n def init_() do\n\n end\n\n @spec insert(word :: String.t) :: any\n def insert(word) do\n\n end\n\n @spec search(word :: String.t) :: boolean\n def search(word) do\n\n end\n\n @spec starts_with(prefix :: String.t) :: boolean\n def starts_with(prefix) do\n\n end\nend\n\n# Your functions will be called as such:\n# Trie.init_()\n# Trie.insert(word)\n# param_2 = Trie.search(word)\n# param_3 = Trie.starts_with(prefix)\n\n# Trie.init_ will be called before every test case, in which you can do some necessary initializations.",
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"sampleTestCase": "[\"Trie\",\"insert\",\"search\",\"search\",\"startsWith\",\"insert\",\"search\"]\n[[],[\"apple\"],[\"apple\"],[\"app\"],[\"app\"],[\"app\"],[\"app\"]]",
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 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 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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