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.
\n\n[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.
\n\n\n
Example 1:
\n\n\nInput: nums = [1,2,3,4]\nOutput: 3\nExplanation: We have 3 arithmetic slices in nums: [1, 2, 3], [2, 3, 4] and [1,2,3,4] itself.\n\n\n
Example 2:
\n\n\nInput: nums = [1]\nOutput: 0\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 5000-1000 <= nums[i] <= 1000如果一个数列 至少有三个元素 ，并且任意两个相邻元素之差相同，则称该数列为等差数列。
\n\n[1,3,5,7,9]、[7,7,7,7] 和 [3,-1,-5,-9] 都是等差数列。给你一个整数数组 nums ，返回数组 nums 中所有为等差数组的 子数组 个数。
子数组 是数组中的一个连续序列。
\n\n\n\n
示例 1：
\n\n\n输入：nums = [1,2,3,4]\n输出：3\n解释：nums 中有三个子等差数组：[1, 2, 3]、[2, 3, 4] 和 [1,2,3,4] 自身。\n\n\n
示例 2：
\n\n\n输入：nums = [1]\n输出：0\n\n\n
\n\n
提示：
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