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.
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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
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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。
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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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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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