Max Subarray Sum

Problem Description

Given an array of integers and a number k, your task is to find the maximum sum of any contiguous subarray of size k.

For example, given the array [2, 1, 5, 1, 3, 2] and k = 3, the maximum sum of any contiguous subarray of size 3 is 9, as the subarray [5, 1, 3] sums up to 9.

Requirements

• Implement a function/method that accepts an integer array arr and an integer k.
• Return the maximum sum obtainable from any contiguous subarray of size k.
• If the array length is less than k, you may return an appropriate result (e.g., 0 or an error) as per your design.

Hint: Use the sliding window technique to efficiently compute the sums.

Historical Note

On January 5th, many are reminded of new beginnings and fresh challenges. Embrace this spirit as you tackle this problem, refining your skills in problem solving and efficient algorithm design!