Arithmetic Slices

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Problem Statement

An integer array is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the same.

For example, [1,3,5,7,9] , [7,7,7,7] , and [3,-1,-5,-9] are arithmetic sequences.

Given an integer array nums , return the number of arithmetic subarrays of nums .

A subarray is a contiguous subsequence of the array.

Examples

Example 1

Input: nums = [1,2,3,4]
Output: 3
We have 3 arithmetic slices in nums: [1, 2, 3], [2, 3, 4] and [1,2,3,4] itself.

Example 2

Input: nums = [1]
Output: 0

Constraints

1 <= nums.length <= 5000

-1000 <= nums[i] <= 1000

🤔

Medium

Difficulty

Topic Info

ModuleDSA

CategoryArray

Sub-topicDynamic Programming