mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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198 lines
24 KiB
JSON
198 lines
24 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1097",
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"questionFrontendId": "1032",
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"boundTopicId": null,
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"title": "Stream of Characters",
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"titleSlug": "stream-of-characters",
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"content": "<p>Design an algorithm that accepts a stream of characters and checks if a suffix of these characters is a string of a given array of strings <code>words</code>.</p>\n\n<p>For example, if <code>words = ["abc", "xyz"]</code> and the stream added the four characters (one by one) <code>'a'</code>, <code>'x'</code>, <code>'y'</code>, and <code>'z'</code>, your algorithm should detect that the suffix <code>"xyz"</code> of the characters <code>"axyz"</code> matches <code>"xyz"</code> from <code>words</code>.</p>\n\n<p>Implement the <code>StreamChecker</code> class:</p>\n\n<ul>\n\t<li><code>StreamChecker(String[] words)</code> Initializes the object with the strings array <code>words</code>.</li>\n\t<li><code>boolean query(char letter)</code> Accepts a new character from the stream and returns <code>true</code> if any non-empty suffix from the stream forms a word that is in <code>words</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["StreamChecker", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query"]\n[[["cd", "f", "kl"]], ["a"], ["b"], ["c"], ["d"], ["e"], ["f"], ["g"], ["h"], ["i"], ["j"], ["k"], ["l"]]\n<strong>Output</strong>\n[null, false, false, false, true, false, true, false, false, false, false, false, true]\n\n<strong>Explanation</strong>\nStreamChecker streamChecker = new StreamChecker(["cd", "f", "kl"]);\nstreamChecker.query("a"); // return False\nstreamChecker.query("b"); // return False\nstreamChecker.query("c"); // return False\nstreamChecker.query("d"); // return True, because 'cd' is in the wordlist\nstreamChecker.query("e"); // return False\nstreamChecker.query("f"); // return True, because 'f' is in the wordlist\nstreamChecker.query("g"); // return False\nstreamChecker.query("h"); // return False\nstreamChecker.query("i"); // return False\nstreamChecker.query("j"); // return False\nstreamChecker.query("k"); // return False\nstreamChecker.query("l"); // return True, because 'kl' is in the wordlist\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= words.length <= 2000</code></li>\n\t<li><code>1 <= words[i].length <= 200</code></li>\n\t<li><code>words[i]</code> consists of lowercase English letters.</li>\n\t<li><code>letter</code> is a lowercase English letter.</li>\n\t<li>At most <code>4 * 10<sup>4</sup></code> calls will be made to query.</li>\n</ul>\n",
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"difficulty": "Hard",
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"categoryTitle": "Algorithms",
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"name": "Array",
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{
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"name": "Data Stream",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class StreamChecker {\npublic:\n StreamChecker(vector<string>& words) {\n \n }\n \n bool query(char letter) {\n \n }\n};\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker* obj = new StreamChecker(words);\n * bool param_1 = obj->query(letter);\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 StreamChecker {\n\n public StreamChecker(String[] words) {\n \n }\n \n public boolean query(char letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = new StreamChecker(words);\n * boolean param_1 = obj.query(letter);\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Python",
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"langSlug": "python",
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"code": "class StreamChecker(object):\n\n def __init__(self, words):\n \"\"\"\n :type words: List[str]\n \"\"\"\n \n\n def query(self, letter):\n \"\"\"\n :type letter: str\n :rtype: bool\n \"\"\"\n \n\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker(words)\n# param_1 = obj.query(letter)",
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"__typename": "CodeSnippetNode"
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"lang": "Python3",
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"code": "class StreamChecker:\n\n def __init__(self, words: List[str]):\n \n\n def query(self, letter: str) -> bool:\n \n\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker(words)\n# param_1 = obj.query(letter)",
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"lang": "C",
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"code": "\n\n\ntypedef struct {\n \n} StreamChecker;\n\n\nStreamChecker* streamCheckerCreate(char** words, int wordsSize) {\n \n}\n\nbool streamCheckerQuery(StreamChecker* obj, char letter) {\n \n}\n\nvoid streamCheckerFree(StreamChecker* obj) {\n \n}\n\n/**\n * Your StreamChecker struct will be instantiated and called as such:\n * StreamChecker* obj = streamCheckerCreate(words, wordsSize);\n * bool param_1 = streamCheckerQuery(obj, letter);\n \n * streamCheckerFree(obj);\n*/",
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class StreamChecker {\n\n public StreamChecker(string[] words) {\n \n }\n \n public bool Query(char letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = new StreamChecker(words);\n * bool param_1 = obj.Query(letter);\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 {string[]} words\n */\nvar StreamChecker = function(words) {\n \n};\n\n/** \n * @param {character} letter\n * @return {boolean}\n */\nStreamChecker.prototype.query = function(letter) {\n \n};\n\n/** \n * Your StreamChecker object will be instantiated and called as such:\n * var obj = new StreamChecker(words)\n * var param_1 = obj.query(letter)\n */",
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"__typename": "CodeSnippetNode"
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "class StreamChecker {\n constructor(words: string[]) {\n \n }\n\n query(letter: string): boolean {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * var obj = new StreamChecker(words)\n * var param_1 = obj.query(letter)\n */",
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"__typename": "CodeSnippetNode"
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"lang": "PHP",
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"langSlug": "php",
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"code": "class StreamChecker {\n /**\n * @param String[] $words\n */\n function __construct($words) {\n \n }\n \n /**\n * @param String $letter\n * @return Boolean\n */\n function query($letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * $obj = StreamChecker($words);\n * $ret_1 = $obj->query($letter);\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Swift",
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"code": "\nclass StreamChecker {\n\n init(_ words: [String]) {\n \n }\n \n func query(_ letter: Character) -> Bool {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * let obj = StreamChecker(words)\n * let ret_1: Bool = obj.query(letter)\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 StreamChecker(words: Array<String>) {\n\n fun query(letter: Char): Boolean {\n \n }\n\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * var obj = StreamChecker(words)\n * var param_1 = obj.query(letter)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class StreamChecker {\n\n StreamChecker(List<String> words) {\n \n }\n \n bool query(String letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = StreamChecker(words);\n * bool param1 = obj.query(letter);\n */",
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{
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"lang": "Go",
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"langSlug": "golang",
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"code": "type StreamChecker struct {\n \n}\n\n\nfunc Constructor(words []string) StreamChecker {\n \n}\n\n\nfunc (this *StreamChecker) Query(letter byte) bool {\n \n}\n\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * obj := Constructor(words);\n * param_1 := obj.Query(letter);\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class StreamChecker\n\n=begin\n :type words: String[]\n=end\n def initialize(words)\n \n end\n\n\n=begin\n :type letter: Character\n :rtype: Boolean\n=end\n def query(letter)\n \n end\n\n\nend\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker.new(words)\n# param_1 = obj.query(letter)",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "class StreamChecker(_words: Array[String]) {\n\n def query(letter: Char): Boolean = {\n \n }\n\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * var obj = new StreamChecker(words)\n * var param_1 = obj.query(letter)\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 StreamChecker {\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 StreamChecker {\n\n fn new(words: Vec<String>) -> Self {\n \n }\n \n fn query(&self, letter: char) -> bool {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * let obj = StreamChecker::new(words);\n * let ret_1: bool = obj.query(letter);\n */",
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"code": "(define stream-checker%\n (class object%\n (super-new)\n \n ; words : (listof string?)\n (init-field\n words)\n \n ; query : char? -> boolean?\n (define/public (query letter)\n )))\n\n;; Your stream-checker% object will be instantiated and called as such:\n;; (define obj (new stream-checker% [words words]))\n;; (define param_1 (send obj query letter))",
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"__typename": "CodeSnippetNode"
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"lang": "Erlang",
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"code": "-spec stream_checker_init_(Words :: [unicode:unicode_binary()]) -> any().\nstream_checker_init_(Words) ->\n .\n\n-spec stream_checker_query(Letter :: char()) -> boolean().\nstream_checker_query(Letter) ->\n .\n\n\n%% Your functions will be called as such:\n%% stream_checker_init_(Words),\n%% Param_1 = stream_checker_query(Letter),\n\n%% stream_checker_init_ will be called before every test case, in which you can do some necessary initializations.",
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"langSlug": "elixir",
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"code": "defmodule StreamChecker do\n @spec init_(words :: [String.t]) :: any\n def init_(words) do\n \n end\n\n @spec query(letter :: char) :: boolean\n def query(letter) do\n \n end\nend\n\n# Your functions will be called as such:\n# StreamChecker.init_(words)\n# param_1 = StreamChecker.query(letter)\n\n# StreamChecker.init_ will be called before every test case, in which you can do some necessary initializations.",
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"Put the words into a trie, and manage a set of pointers within that trie."
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"sampleTestCase": "[\"StreamChecker\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\"]\n[[[\"cd\",\"f\",\"kl\"]],[\"a\"],[\"b\"],[\"c\"],[\"d\"],[\"e\"],[\"f\"],[\"g\"],[\"h\"],[\"i\"],[\"j\"],[\"k\"],[\"l\"]]",
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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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