mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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194 lines
23 KiB
JSON
194 lines
23 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1294",
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"questionFrontendId": "2080",
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"boundTopicId": null,
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"title": "Range Frequency Queries",
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"titleSlug": "range-frequency-queries",
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"content": "<p>Design a data structure to find the <strong>frequency</strong> of a given value in a given subarray.</p>\n\n<p>The <strong>frequency</strong> of a value in a subarray is the number of occurrences of that value in the subarray.</p>\n\n<p>Implement the <code>RangeFreqQuery</code> class:</p>\n\n<ul>\n\t<li><code>RangeFreqQuery(int[] arr)</code> Constructs an instance of the class with the given <strong>0-indexed</strong> integer array <code>arr</code>.</li>\n\t<li><code>int query(int left, int right, int value)</code> Returns the <strong>frequency</strong> of <code>value</code> in the subarray <code>arr[left...right]</code>.</li>\n</ul>\n\n<p>A <strong>subarray</strong> is a contiguous sequence of elements within an array. <code>arr[left...right]</code> denotes the subarray that contains the elements of <code>nums</code> between indices <code>left</code> and <code>right</code> (<strong>inclusive</strong>).</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["RangeFreqQuery", "query", "query"]\n[[[12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]], [1, 2, 4], [0, 11, 33]]\n<strong>Output</strong>\n[null, 1, 2]\n\n<strong>Explanation</strong>\nRangeFreqQuery rangeFreqQuery = new RangeFreqQuery([12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]);\nrangeFreqQuery.query(1, 2, 4); // return 1. The value 4 occurs 1 time in the subarray [33, 4]\nrangeFreqQuery.query(0, 11, 33); // return 2. The value 33 occurs 2 times in the whole array.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= arr[i], value <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= left <= right < arr.length</code></li>\n\t<li>At most <code>10<sup>5</sup></code> calls will be made to <code>query</code></li>\n</ul>\n",
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"translatedTitle": null,
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"translatedContent": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 609,
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"dislikes": 27,
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"isLiked": null,
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"similarQuestions": "[]",
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"exampleTestcases": "[\"RangeFreqQuery\",\"query\",\"query\"]\n[[[12,33,4,56,22,2,34,33,22,12,34,56]],[1,2,4],[0,11,33]]",
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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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"slug": "array",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Hash Table",
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"slug": "hash-table",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Binary Search",
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"slug": "binary-search",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Design",
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"slug": "design",
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"translatedName": null,
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"__typename": "TopicTagNode"
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},
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{
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"name": "Segment Tree",
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"slug": "segment-tree",
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"translatedName": null,
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"__typename": "TopicTagNode"
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}
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],
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"companyTagStats": null,
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"codeSnippets": [
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{
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class RangeFreqQuery {\npublic:\n RangeFreqQuery(vector<int>& arr) {\n \n }\n \n int query(int left, int right, int value) {\n \n }\n};\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * RangeFreqQuery* obj = new RangeFreqQuery(arr);\n * int param_1 = obj->query(left,right,value);\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 RangeFreqQuery {\n\n public RangeFreqQuery(int[] arr) {\n \n }\n \n public int query(int left, int right, int value) {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * RangeFreqQuery obj = new RangeFreqQuery(arr);\n * int param_1 = obj.query(left,right,value);\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 RangeFreqQuery(object):\n\n def __init__(self, arr):\n \"\"\"\n :type arr: List[int]\n \"\"\"\n \n\n def query(self, left, right, value):\n \"\"\"\n :type left: int\n :type right: int\n :type value: int\n :rtype: int\n \"\"\"\n \n\n\n# Your RangeFreqQuery object will be instantiated and called as such:\n# obj = RangeFreqQuery(arr)\n# param_1 = obj.query(left,right,value)",
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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 RangeFreqQuery:\n\n def __init__(self, arr: List[int]):\n \n\n def query(self, left: int, right: int, value: int) -> int:\n \n\n\n# Your RangeFreqQuery object will be instantiated and called as such:\n# obj = RangeFreqQuery(arr)\n# param_1 = obj.query(left,right,value)",
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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} RangeFreqQuery;\n\n\nRangeFreqQuery* rangeFreqQueryCreate(int* arr, int arrSize) {\n \n}\n\nint rangeFreqQueryQuery(RangeFreqQuery* obj, int left, int right, int value) {\n \n}\n\nvoid rangeFreqQueryFree(RangeFreqQuery* obj) {\n \n}\n\n/**\n * Your RangeFreqQuery struct will be instantiated and called as such:\n * RangeFreqQuery* obj = rangeFreqQueryCreate(arr, arrSize);\n * int param_1 = rangeFreqQueryQuery(obj, left, right, value);\n \n * rangeFreqQueryFree(obj);\n*/",
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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": "csharp",
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"code": "public class RangeFreqQuery {\n\n public RangeFreqQuery(int[] arr) {\n \n }\n \n public int Query(int left, int right, int value) {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * RangeFreqQuery obj = new RangeFreqQuery(arr);\n * int param_1 = obj.Query(left,right,value);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {number[]} arr\n */\nvar RangeFreqQuery = function(arr) {\n \n};\n\n/** \n * @param {number} left \n * @param {number} right \n * @param {number} value\n * @return {number}\n */\nRangeFreqQuery.prototype.query = function(left, right, value) {\n \n};\n\n/** \n * Your RangeFreqQuery object will be instantiated and called as such:\n * var obj = new RangeFreqQuery(arr)\n * var param_1 = obj.query(left,right,value)\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 RangeFreqQuery {\n constructor(arr: number[]) {\n \n }\n\n query(left: number, right: number, value: number): number {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * var obj = new RangeFreqQuery(arr)\n * var param_1 = obj.query(left,right,value)\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "PHP",
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"langSlug": "php",
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"code": "class RangeFreqQuery {\n /**\n * @param Integer[] $arr\n */\n function __construct($arr) {\n \n }\n \n /**\n * @param Integer $left\n * @param Integer $right\n * @param Integer $value\n * @return Integer\n */\n function query($left, $right, $value) {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * $obj = RangeFreqQuery($arr);\n * $ret_1 = $obj->query($left, $right, $value);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Swift",
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"langSlug": "swift",
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"code": "\nclass RangeFreqQuery {\n\n init(_ arr: [Int]) {\n \n }\n \n func query(_ left: Int, _ right: Int, _ value: Int) -> Int {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * let obj = RangeFreqQuery(arr)\n * let ret_1: Int = obj.query(left, right, value)\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 RangeFreqQuery(arr: IntArray) {\n\n fun query(left: Int, right: Int, value: Int): Int {\n \n }\n\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * var obj = RangeFreqQuery(arr)\n * var param_1 = obj.query(left,right,value)\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 RangeFreqQuery {\n\n RangeFreqQuery(List<int> arr) {\n \n }\n \n int query(int left, int right, int value) {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * RangeFreqQuery obj = RangeFreqQuery(arr);\n * int param1 = obj.query(left,right,value);\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 RangeFreqQuery struct {\n \n}\n\n\nfunc Constructor(arr []int) RangeFreqQuery {\n \n}\n\n\nfunc (this *RangeFreqQuery) Query(left int, right int, value int) int {\n \n}\n\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * obj := Constructor(arr);\n * param_1 := obj.Query(left,right,value);\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 RangeFreqQuery\n\n=begin\n :type arr: Integer[]\n=end\n def initialize(arr)\n \n end\n\n\n=begin\n :type left: Integer\n :type right: Integer\n :type value: Integer\n :rtype: Integer\n=end\n def query(left, right, value)\n \n end\n\n\nend\n\n# Your RangeFreqQuery object will be instantiated and called as such:\n# obj = RangeFreqQuery.new(arr)\n# param_1 = obj.query(left, right, value)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Scala",
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"langSlug": "scala",
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"code": "class RangeFreqQuery(_arr: Array[Int]) {\n\n def query(left: Int, right: Int, value: Int): Int = {\n \n }\n\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * var obj = new RangeFreqQuery(arr)\n * var param_1 = obj.query(left,right,value)\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 RangeFreqQuery {\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 RangeFreqQuery {\n\n fn new(arr: Vec<i32>) -> Self {\n \n }\n \n fn query(&self, left: i32, right: i32, value: i32) -> i32 {\n \n }\n}\n\n/**\n * Your RangeFreqQuery object will be instantiated and called as such:\n * let obj = RangeFreqQuery::new(arr);\n * let ret_1: i32 = obj.query(left, right, value);\n */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define range-freq-query%\n (class object%\n (super-new)\n \n ; arr : (listof exact-integer?)\n (init-field\n arr)\n \n ; query : exact-integer? exact-integer? exact-integer? -> exact-integer?\n (define/public (query left right value)\n )))\n\n;; Your range-freq-query% object will be instantiated and called as such:\n;; (define obj (new range-freq-query% [arr arr]))\n;; (define param_1 (send obj query left right value))",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec range_freq_query_init_(Arr :: [integer()]) -> any().\nrange_freq_query_init_(Arr) ->\n .\n\n-spec range_freq_query_query(Left :: integer(), Right :: integer(), Value :: integer()) -> integer().\nrange_freq_query_query(Left, Right, Value) ->\n .\n\n\n%% Your functions will be called as such:\n%% range_freq_query_init_(Arr),\n%% Param_1 = range_freq_query_query(Left, Right, Value),\n\n%% range_freq_query_init_ will be called before every test case, in which you can do some necessary initializations.",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule RangeFreqQuery do\n @spec init_(arr :: [integer]) :: any\n def init_(arr) do\n \n end\n\n @spec query(left :: integer, right :: integer, value :: integer) :: integer\n def query(left, right, value) do\n \n end\nend\n\n# Your functions will be called as such:\n# RangeFreqQuery.init_(arr)\n# param_1 = RangeFreqQuery.query(left, right, value)\n\n# RangeFreqQuery.init_ will be called before every test case, in which you can do some necessary initializations.",
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"__typename": "CodeSnippetNode"
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}
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],
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"stats": "{\"totalAccepted\": \"18.8K\", \"totalSubmission\": \"47.8K\", \"totalAcceptedRaw\": 18757, \"totalSubmissionRaw\": 47763, \"acRate\": \"39.3%\"}",
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"hints": [
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"The queries must be answered efficiently to avoid time limit exceeded verdict.",
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"Store the elements of the array in a data structure that helps answering the queries efficiently.",
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"Use a hash table that stored for each value, the indices where that value appeared.",
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"Use binary search over the indices of a value to find its range frequency."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"RangeFreqQuery\",\"query\",\"query\"]\n[[[12,33,4,56,22,2,34,33,22,12,34,56]],[1,2,4],[0,11,33]]",
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"metaData": "{\n \"classname\": \"RangeFreqQuery\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer[]\",\n \"name\": \"arr\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"left\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"right\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"value\"\n }\n ],\n \"name\": \"query\",\n \"return\": {\n \"type\": \"integer\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
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"judgerAvailable": true,
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"judgeType": "large",
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"mysqlSchemas": [],
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"enableRunCode": true,
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"enableTestMode": false,
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"enableDebugger": true,
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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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