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.
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
Explanation: 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
413. Arithmetic Slices
Medium
30 Points
Array
Dynamic Programming
Sliding Window
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.
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
Explanation: We have 3 arithmetic slices in nums: [1, 2, 3], [2, 3, 4] and [1,2,3,4] itself.