Sum of All Odd Length Subarrays SOLUTION

Sum of All Odd Length Subarrays SOLUTION Biweekly Contest 35

 
Given a variety of positive numbers arr, figure the entirety of all conceivable odd-length subarrays. 
 
A subarray is a coterminous aftereffect of the exhibit. 
 
Return the aggregate of all odd-length subarrays of arr. 
 
Model 1: 
 
Info: arr = [1,4,2,5,3] 
 
Yield: 58 
 
Clarification: The odd-length subarrays of arr and their aggregates are: 
 
[1] = 1 
 
[4] = 4 
 
[2] = 2 
 
[5] = 5 
 
[3] = 3 
 
[1,4,2] = 7 
 
[4,2,5] = 11 
 
[2,5,3] = 10 
 
[1,4,2,5,3] = 15 
 
On the off chance that we include all these together we get 1 + 4 + 2 + 5 + 3 + 7 + 11 + 10 + 15 = 58 
 
Model 2: 
 
Info: arr = [1,2] 
 
Yield: 3 
 
Clarification: There are just 2 subarrays of odd length, [1] and [2]. Their aggregate is 3. 
 
Model 3: 
 
Information: arr = [10,11,12] 
 
Yield: 66 
 
Limitations: 
 
1 <= arr.length <= 100 
 
1 <= arr[i] <= 1000
 

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