Arithmetic Slices 2

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1. You are given an array(arr) of integers.
2. You have to find the count of arithmetic slices in the given array.
3. Arithmetic slice is defined as the sub-sequence of an array having all its elements in A.P and length of sub-sequence should be greater than or equal to 3.
Input Format
A number N
arr1
arr2.. N numbers
Output Format
Check the sample output and question video.
Question Video
Constraints
1 <= N <= 1000
-10^8 <= arr[i] <= 10^8
Sample Input
4
1
2
3
4
Sample Output
3


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