Problem Statement

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

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

A subarray is a contiguous subsequence of the array.

Examples

Example 1:

• Input: [1, 3, 5, 7, 9, 10, 11]
• Expected Output: 7
• Justification: The segments that form arithmetic sequences are [1, 3, 5], [3, 5, 7], [5, 7, 9], [1, 3, 5, 7], [3, 5, 7, 9], [1, 3, 5, 7, 9], and