{ "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
.
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.
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
Example 1:
\n\n\nInput: nums =\n\n[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.
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\nn == nums.length
m == l.length
m == r.length
2 <= n <= 500
1 <= m <= 500
0 <= l[i] < r[i] < n
-105 <= nums[i] <= 105
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 i
, s[i+1] - s[i] == s[1] - s[0]
都成立。
例如,下面这些都是 等差数列 :
\n\n1, 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\n1, 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 l
和 r
,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。
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
示例 1:
\n\n输入:nums =\n\n[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] 。
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\nn == nums.length
m == l.length
m == r.length
2 <= n <= 500
1 <= m <= 500
0 <= l[i] < r[i] < n
-105 <= nums[i] <= 105
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