mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
25 KiB
JSON
174 lines
25 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1995",
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"questionFrontendId": "1865",
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"boundTopicId": null,
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"title": "Finding Pairs With a Certain Sum",
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"titleSlug": "finding-pairs-with-a-certain-sum",
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"content": "<p>You are given two integer arrays <code>nums1</code> and <code>nums2</code>. You are tasked to implement a data structure that supports queries of two types:</p>\n\n<ol>\n\t<li><strong>Add</strong> a positive integer to an element of a given index in the array <code>nums2</code>.</li>\n\t<li><strong>Count</strong> the number of pairs <code>(i, j)</code> such that <code>nums1[i] + nums2[j]</code> equals a given value (<code>0 <= i < nums1.length</code> and <code>0 <= j < nums2.length</code>).</li>\n</ol>\n\n<p>Implement the <code>FindSumPairs</code> class:</p>\n\n<ul>\n\t<li><code>FindSumPairs(int[] nums1, int[] nums2)</code> Initializes the <code>FindSumPairs</code> object with two integer arrays <code>nums1</code> and <code>nums2</code>.</li>\n\t<li><code>void add(int index, int val)</code> Adds <code>val</code> to <code>nums2[index]</code>, i.e., apply <code>nums2[index] += val</code>.</li>\n\t<li><code>int count(int tot)</code> Returns the number of pairs <code>(i, j)</code> such that <code>nums1[i] + nums2[j] == tot</code>.</li>\n</ul>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["FindSumPairs", "count", "add", "count", "count", "add", "add", "count"]\n[[[1, 1, 2, 2, 2, 3], [1, 4, 5, 2, 5, 4]], [7], [3, 2], [8], [4], [0, 1], [1, 1], [7]]\n<strong>Output</strong>\n[null, 8, null, 2, 1, null, null, 11]\n\n<strong>Explanation</strong>\nFindSumPairs findSumPairs = new FindSumPairs([1, 1, 2, 2, 2, 3], [1, 4, 5, 2, 5, 4]);\nfindSumPairs.count(7); // return 8; pairs (2,2), (3,2), (4,2), (2,4), (3,4), (4,4) make 2 + 5 and pairs (5,1), (5,5) make 3 + 4\nfindSumPairs.add(3, 2); // now nums2 = [1,4,5,<strong><u>4</u></strong><code>,5,4</code>]\nfindSumPairs.count(8); // return 2; pairs (5,2), (5,4) make 3 + 5\nfindSumPairs.count(4); // return 1; pair (5,0) makes 3 + 1\nfindSumPairs.add(0, 1); // now nums2 = [<strong><u><code>2</code></u></strong>,4,5,4<code>,5,4</code>]\nfindSumPairs.add(1, 1); // now nums2 = [<code>2</code>,<strong><u>5</u></strong>,5,4<code>,5,4</code>]\nfindSumPairs.count(7); // return 11; pairs (2,1), (2,2), (2,4), (3,1), (3,2), (3,4), (4,1), (4,2), (4,4) make 2 + 5 and pairs (5,3), (5,5) make 3 + 4\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums1.length <= 1000</code></li>\n\t<li><code>1 <= nums2.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= nums1[i] <= 10<sup>9</sup></code></li>\n\t<li><code>1 <= nums2[i] <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= index < nums2.length</code></li>\n\t<li><code>1 <= val <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= tot <= 10<sup>9</sup></code></li>\n\t<li>At most <code>1000</code> calls are made to <code>add</code> and <code>count</code> <strong>each</strong>.</li>\n</ul>\n",
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"exampleTestcases": "[\"FindSumPairs\",\"count\",\"add\",\"count\",\"count\",\"add\",\"add\",\"count\"]\n[[[1,1,2,2,2,3],[1,4,5,2,5,4]],[7],[3,2],[8],[4],[0,1],[1,1],[7]]",
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"code": "class FindSumPairs {\npublic:\n FindSumPairs(vector<int>& nums1, vector<int>& nums2) {\n \n }\n \n void add(int index, int val) {\n \n }\n \n int count(int tot) {\n \n }\n};\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * FindSumPairs* obj = new FindSumPairs(nums1, nums2);\n * obj->add(index,val);\n * int param_2 = obj->count(tot);\n */",
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"code": "class FindSumPairs {\n\n public FindSumPairs(int[] nums1, int[] nums2) {\n \n }\n \n public void add(int index, int val) {\n \n }\n \n public int count(int tot) {\n \n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * FindSumPairs obj = new FindSumPairs(nums1, nums2);\n * obj.add(index,val);\n * int param_2 = obj.count(tot);\n */",
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"code": "class FindSumPairs(object):\n\n def __init__(self, nums1, nums2):\n \"\"\"\n :type nums1: List[int]\n :type nums2: List[int]\n \"\"\"\n \n\n def add(self, index, val):\n \"\"\"\n :type index: int\n :type val: int\n :rtype: None\n \"\"\"\n \n\n def count(self, tot):\n \"\"\"\n :type tot: int\n :rtype: int\n \"\"\"\n \n\n\n# Your FindSumPairs object will be instantiated and called as such:\n# obj = FindSumPairs(nums1, nums2)\n# obj.add(index,val)\n# param_2 = obj.count(tot)",
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"code": "class FindSumPairs:\n\n def __init__(self, nums1: List[int], nums2: List[int]):\n \n\n def add(self, index: int, val: int) -> None:\n \n\n def count(self, tot: int) -> int:\n \n\n\n# Your FindSumPairs object will be instantiated and called as such:\n# obj = FindSumPairs(nums1, nums2)\n# obj.add(index,val)\n# param_2 = obj.count(tot)",
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"lang": "C",
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"code": "\n\n\ntypedef struct {\n \n} FindSumPairs;\n\n\nFindSumPairs* findSumPairsCreate(int* nums1, int nums1Size, int* nums2, int nums2Size) {\n \n}\n\nvoid findSumPairsAdd(FindSumPairs* obj, int index, int val) {\n \n}\n\nint findSumPairsCount(FindSumPairs* obj, int tot) {\n \n}\n\nvoid findSumPairsFree(FindSumPairs* obj) {\n \n}\n\n/**\n * Your FindSumPairs struct will be instantiated and called as such:\n * FindSumPairs* obj = findSumPairsCreate(nums1, nums1Size, nums2, nums2Size);\n * findSumPairsAdd(obj, index, val);\n \n * int param_2 = findSumPairsCount(obj, tot);\n \n * findSumPairsFree(obj);\n*/",
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"code": "public class FindSumPairs {\n\n public FindSumPairs(int[] nums1, int[] nums2) {\n \n }\n \n public void Add(int index, int val) {\n \n }\n \n public int Count(int tot) {\n \n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * FindSumPairs obj = new FindSumPairs(nums1, nums2);\n * obj.Add(index,val);\n * int param_2 = obj.Count(tot);\n */",
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"code": "/**\n * @param {number[]} nums1\n * @param {number[]} nums2\n */\nvar FindSumPairs = function(nums1, nums2) {\n \n};\n\n/** \n * @param {number} index \n * @param {number} val\n * @return {void}\n */\nFindSumPairs.prototype.add = function(index, val) {\n \n};\n\n/** \n * @param {number} tot\n * @return {number}\n */\nFindSumPairs.prototype.count = function(tot) {\n \n};\n\n/** \n * Your FindSumPairs object will be instantiated and called as such:\n * var obj = new FindSumPairs(nums1, nums2)\n * obj.add(index,val)\n * var param_2 = obj.count(tot)\n */",
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"lang": "Ruby",
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"code": "class FindSumPairs\n\n=begin\n :type nums1: Integer[]\n :type nums2: Integer[]\n=end\n def initialize(nums1, nums2)\n \n end\n\n\n=begin\n :type index: Integer\n :type val: Integer\n :rtype: Void\n=end\n def add(index, val)\n \n end\n\n\n=begin\n :type tot: Integer\n :rtype: Integer\n=end\n def count(tot)\n \n end\n\n\nend\n\n# Your FindSumPairs object will be instantiated and called as such:\n# obj = FindSumPairs.new(nums1, nums2)\n# obj.add(index, val)\n# param_2 = obj.count(tot)",
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"lang": "Swift",
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"code": "\nclass FindSumPairs {\n\n init(_ nums1: [Int], _ nums2: [Int]) {\n \n }\n \n func add(_ index: Int, _ val: Int) {\n \n }\n \n func count(_ tot: Int) -> Int {\n \n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * let obj = FindSumPairs(nums1, nums2)\n * obj.add(index, val)\n * let ret_2: Int = obj.count(tot)\n */",
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"lang": "Go",
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"code": "type FindSumPairs struct {\n \n}\n\n\nfunc Constructor(nums1 []int, nums2 []int) FindSumPairs {\n \n}\n\n\nfunc (this *FindSumPairs) Add(index int, val int) {\n \n}\n\n\nfunc (this *FindSumPairs) Count(tot int) int {\n \n}\n\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * obj := Constructor(nums1, nums2);\n * obj.Add(index,val);\n * param_2 := obj.Count(tot);\n */",
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"lang": "Scala",
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"code": "class FindSumPairs(_nums1: Array[Int], _nums2: Array[Int]) {\n\n def add(index: Int, `val`: Int) {\n \n }\n\n def count(tot: Int): Int = {\n \n }\n\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * var obj = new FindSumPairs(nums1, nums2)\n * obj.add(index,`val`)\n * var param_2 = obj.count(tot)\n */",
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"lang": "Kotlin",
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"code": "class FindSumPairs(nums1: IntArray, nums2: IntArray) {\n\n fun add(index: Int, `val`: Int) {\n \n }\n\n fun count(tot: Int): Int {\n \n }\n\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * var obj = FindSumPairs(nums1, nums2)\n * obj.add(index,`val`)\n * var param_2 = obj.count(tot)\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Rust",
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"code": "struct FindSumPairs {\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 FindSumPairs {\n\n fn new(nums1: Vec<i32>, nums2: Vec<i32>) -> Self {\n \n }\n \n fn add(&self, index: i32, val: i32) {\n \n }\n \n fn count(&self, tot: i32) -> i32 {\n \n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * let obj = FindSumPairs::new(nums1, nums2);\n * obj.add(index, val);\n * let ret_2: i32 = obj.count(tot);\n */",
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"lang": "PHP",
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"langSlug": "php",
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"code": "class FindSumPairs {\n /**\n * @param Integer[] $nums1\n * @param Integer[] $nums2\n */\n function __construct($nums1, $nums2) {\n \n }\n \n /**\n * @param Integer $index\n * @param Integer $val\n * @return NULL\n */\n function add($index, $val) {\n \n }\n \n /**\n * @param Integer $tot\n * @return Integer\n */\n function count($tot) {\n \n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * $obj = FindSumPairs($nums1, $nums2);\n * $obj->add($index, $val);\n * $ret_2 = $obj->count($tot);\n */",
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"lang": "TypeScript",
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"code": "class FindSumPairs {\n constructor(nums1: number[], nums2: number[]) {\n\n }\n\n add(index: number, val: number): void {\n\n }\n\n count(tot: number): number {\n\n }\n}\n\n/**\n * Your FindSumPairs object will be instantiated and called as such:\n * var obj = new FindSumPairs(nums1, nums2)\n * obj.add(index,val)\n * var param_2 = obj.count(tot)\n */",
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"lang": "Racket",
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"code": "(define find-sum-pairs%\n (class object%\n (super-new)\n\n ; nums1 : (listof exact-integer?)\n\n ; nums2 : (listof exact-integer?)\n (init-field\n nums1\n nums2)\n \n ; add : exact-integer? exact-integer? -> void?\n (define/public (add index val)\n\n )\n ; count : exact-integer? -> exact-integer?\n (define/public (count tot)\n\n )))\n\n;; Your find-sum-pairs% object will be instantiated and called as such:\n;; (define obj (new find-sum-pairs% [nums1 nums1] [nums2 nums2]))\n;; (send obj add index val)\n;; (define param_2 (send obj count tot))",
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"code": "-spec find_sum_pairs_init_(Nums1 :: [integer()], Nums2 :: [integer()]) -> any().\nfind_sum_pairs_init_(Nums1, Nums2) ->\n .\n\n-spec find_sum_pairs_add(Index :: integer(), Val :: integer()) -> any().\nfind_sum_pairs_add(Index, Val) ->\n .\n\n-spec find_sum_pairs_count(Tot :: integer()) -> integer().\nfind_sum_pairs_count(Tot) ->\n .\n\n\n%% Your functions will be called as such:\n%% find_sum_pairs_init_(Nums1, Nums2),\n%% find_sum_pairs_add(Index, Val),\n%% Param_2 = find_sum_pairs_count(Tot),\n\n%% find_sum_pairs_init_ will be called before every test case, in which you can do some necessary initializations.",
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"code": "defmodule FindSumPairs do\n @spec init_(nums1 :: [integer], nums2 :: [integer]) :: any\n def init_(nums1, nums2) do\n\n end\n\n @spec add(index :: integer, val :: integer) :: any\n def add(index, val) do\n\n end\n\n @spec count(tot :: integer) :: integer\n def count(tot) do\n\n end\nend\n\n# Your functions will be called as such:\n# FindSumPairs.init_(nums1, nums2)\n# FindSumPairs.add(index, val)\n# param_2 = FindSumPairs.count(tot)\n\n# FindSumPairs.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 length of nums1 is small in comparison to that of nums2",
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"If we iterate over elements of nums1 we just need to find the count of tot - element for all elements in nums1"
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"sampleTestCase": "[\"FindSumPairs\",\"count\",\"add\",\"count\",\"count\",\"add\",\"add\",\"count\"]\n[[[1,1,2,2,2,3],[1,4,5,2,5,4]],[7],[3,2],[8],[4],[0,1],[1,1],[7]]",
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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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