{ "data": { "question": { "questionId": "1294", "questionFrontendId": "2080", "categoryTitle": "Algorithms", "boundTopicId": 1110237, "title": "Range Frequency Queries", "titleSlug": "range-frequency-queries", "content": "

Design a data structure to find the frequency of a given value in a given subarray.

\n\n

The frequency of a value in a subarray is the number of occurrences of that value in the subarray.

\n\n

Implement the RangeFreqQuery class:

\n\n\n\n

A subarray is a contiguous sequence of elements within an array. arr[left...right] denotes the subarray that contains the elements of nums between indices left and right (inclusive).

\n\n

 

\n

Example 1:

\n\n
\nInput\n["RangeFreqQuery", "query", "query"]\n[[[12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]], [1, 2, 4], [0, 11, 33]]\nOutput\n[null, 1, 2]\n\nExplanation\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
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "区间内查询数字的频率", "translatedContent": "

请你设计一个数据结构，它能求出给定子数组内一个给定值的 频率 。

\n\n

子数组中一个值的 频率 指的是这个子数组中这个值的出现次数。

\n\n

请你实现 RangeFreqQuery 类：

\n\n\n\n

一个 子数组 指的是数组中一段连续的元素。arr[left...right] 指的是 nums 中包含下标 left 和 right 在内 的中间一段连续元素。

\n\n

 

\n\n

示例 1：

\n\n
输入：\n[\"RangeFreqQuery\", \"query\", \"query\"]\n[[[12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]], [1, 2, 4], [0, 11, 33]]\n输出：\n[null, 1, 2]\n\n解释：\nRangeFreqQuery rangeFreqQuery = new RangeFreqQuery([12, 33, 4, 56, 22, 2, 34, 33, 22, 12, 34, 56]);\nrangeFreqQuery.query(1, 2, 4); // 返回 1 。4 在子数组 [33, 4] 中出现 1 次。\nrangeFreqQuery.query(0, 11, 33); // 返回 2 。33 在整个子数组中出现 2 次。\n
\n\n

 

\n\n

提示：

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"__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": "哈希表", "__typename": "TopicTagNode" }, { "name": "Binary Search", "slug": "binary-search", "translatedName": "二分查找", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class RangeFreqQuery {\npublic:\n RangeFreqQuery(vector& 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 */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "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)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "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)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "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*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class RangeFreqQuery {\n\n RangeFreqQuery(List 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 */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "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)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "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 */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "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) -> 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 */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "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))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "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.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "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.", "__typename": "CodeSnippetNode" } ], 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