{ "data": { "question": { "questionId": "1752", "questionFrontendId": "1630", "categoryTitle": "Algorithms", "boundTopicId": 455011, "title": "Arithmetic Subarrays", "titleSlug": "arithmetic-subarrays", "content": "

A sequence of numbers is called arithmetic if it consists of at least two elements, and the difference between every two consecutive elements is the same. More formally, a sequence s is arithmetic if and only if s[i+1] - s[i] == s[1] - s[0] for all valid i.

\n\n

For example, these are arithmetic sequences:

\n\n
\n1, 3, 5, 7, 9\n7, 7, 7, 7\n3, -1, -5, -9
\n\n

The following sequence is not arithmetic:

\n\n
\n1, 1, 2, 5, 7
\n\n

You are given an array of n integers, nums, and two arrays of m integers each, l and r, representing the m range queries, where the ith query is the range [l[i], r[i]]. All the arrays are 0-indexed.

\n\n

Return a list of boolean elements answer, where answer[i] is true if the subarray nums[l[i]], nums[l[i]+1], ... , nums[r[i]] can be rearranged to form an arithmetic sequence, and false otherwise.

\n\n

 

\n

Example 1:

\n\n
\nInput: nums = [4,6,5,9,3,7], l = [0,0,2], r = [2,3,5]\nOutput: [true,false,true]\nExplanation:\nIn the 0th query, the subarray is [4,6,5]. This can be rearranged as [6,5,4], which is an arithmetic sequence.\nIn the 1st query, the subarray is [4,6,5,9]. This cannot be rearranged as an arithmetic sequence.\nIn the 2nd query, the subarray is [5,9,3,7]. This can be rearranged as [3,5,7,9], which is an arithmetic sequence.
\n\n

Example 2:

\n\n
\nInput: nums = [-12,-9,-3,-12,-6,15,20,-25,-20,-15,-10], l = [0,1,6,4,8,7], r = [4,4,9,7,9,10]\nOutput: [false,true,false,false,true,true]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "等差子数组", "translatedContent": "

如果一个数列由至少两个元素组成,且每两个连续元素之间的差值都相同,那么这个序列就是 等差数列 。更正式地,数列 s 是等差数列,只需要满足:对于每个有效的 is[i+1] - s[i] == s[1] - s[0] 都成立。

\n\n

例如,下面这些都是 等差数列

\n\n
1, 3, 5, 7, 9\n7, 7, 7, 7\n3, -1, -5, -9
\n\n

下面的数列 不是等差数列

\n\n
1, 1, 2, 5, 7
\n\n

给你一个由 n 个整数组成的数组 nums,和两个由 m 个整数组成的数组 lr,后两个数组表示 m 组范围查询,其中第 i 个查询对应范围 [l[i], r[i]] 。所有数组的下标都是 从 0 开始 的。

\n\n

返回 boolean 元素构成的答案列表 answer 。如果子数组 nums[l[i]], nums[l[i]+1], ... , nums[r[i]] 可以 重新排列 形成 等差数列answer[i] 的值就是 true;否则answer[i] 的值就是 false

\n\n

 

\n\n

示例 1:

\n\n
输入:nums = [4,6,5,9,3,7], l = [0,0,2], r = [2,3,5]\n输出:[true,false,true]\n解释:\n第 0 个查询,对应子数组 [4,6,5] 。可以重新排列为等差数列 [6,5,4] 。\n第 1 个查询,对应子数组 [4,6,5,9] 。无法重新排列形成等差数列。\n第 2 个查询,对应子数组 [5,9,3,7] 。可以重新排列为等差数列 [3,5,7,9] 。
\n\n

示例 2:

\n\n
输入:nums = [-12,-9,-3,-12,-6,15,20,-25,-20,-15,-10], l = [0,1,6,4,8,7], r = [4,4,9,7,9,10]\n输出:[false,true,false,false,true,true]\n
\n\n

 

\n\n

提示:

\n\n\n", "isPaidOnly": false, "difficulty": "Medium", "likes": 18, "dislikes": 0, "isLiked": null, "similarQuestions": "[]", "contributors": [], "langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"ruby\": false, \"bash\": false, \"swift\": false, \"golang\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"kotlin\": false, \"rust\": false, \"php\": false, \"typescript\": false, \"racket\": false, \"erlang\": false, \"elixir\": false}", "topicTags": [ { "name": "Array", "slug": "array", "translatedName": "数组", "__typename": "TopicTagNode" }, { "name": "Sorting", "slug": "sorting", "translatedName": "排序", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Solution {\npublic:\n vector checkArithmeticSubarrays(vector& nums, vector& l, vector& r) {\n\n }\n};", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class Solution {\n public List checkArithmeticSubarrays(int[] nums, int[] l, int[] r) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class Solution(object):\n def checkArithmeticSubarrays(self, nums, l, r):\n \"\"\"\n :type nums: List[int]\n :type l: List[int]\n :type r: List[int]\n :rtype: List[bool]\n \"\"\"", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class Solution:\n def checkArithmeticSubarrays(self, nums: List[int], l: List[int], r: List[int]) -> List[bool]:", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nbool* checkArithmeticSubarrays(int* nums, int numsSize, int* l, int lSize, int* r, int rSize, int* returnSize){\n\n}", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Solution {\n public IList CheckArithmeticSubarrays(int[] nums, int[] l, int[] r) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number[]} nums\n * @param {number[]} l\n * @param {number[]} r\n * @return {boolean[]}\n */\nvar checkArithmeticSubarrays = function(nums, l, r) {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# @param {Integer[]} nums\n# @param {Integer[]} l\n# @param {Integer[]} r\n# @return {Boolean[]}\ndef check_arithmetic_subarrays(nums, l, r)\n\nend", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "class Solution {\n func checkArithmeticSubarrays(_ nums: [Int], _ l: [Int], _ r: [Int]) -> [Bool] {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "func checkArithmeticSubarrays(nums []int, l []int, r []int) []bool {\n\n}", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "object Solution {\n def checkArithmeticSubarrays(nums: Array[Int], l: Array[Int], r: Array[Int]): List[Boolean] = {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Solution {\n fun checkArithmeticSubarrays(nums: IntArray, l: IntArray, r: IntArray): List {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "impl Solution {\n pub fn check_arithmetic_subarrays(nums: Vec, l: Vec, r: Vec) -> Vec {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Solution {\n\n /**\n * @param Integer[] $nums\n * @param Integer[] $l\n * @param Integer[] $r\n * @return Boolean[]\n */\n function checkArithmeticSubarrays($nums, $l, $r) {\n\n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "function checkArithmeticSubarrays(nums: number[], l: number[], r: number[]): boolean[] {\n\n};", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define/contract (check-arithmetic-subarrays nums l r)\n (-> (listof exact-integer?) (listof exact-integer?) (listof exact-integer?) 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