Given an array of positive integers arr, return the sum of all possible subarrays that have an odd length.

A subarray is a contiguous sequence of elements within the array.

Constraints:

• $1 \leq$ arr.length $\leq 100$

• $1 \leq$ arr[i] $\leq 1000$

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.