Describe an advanced data structure : Binary Searching for an Optimal Subarray Length

The video tutorial explains how to find the longest subarray where the difference between the maximum and minimum values is less than or equal to a given number K. It introduces the use of binary search to determine the optimal subarray length and explains the logic behind why binary search is applicable. The tutorial provides a step-by-step guide to implementing the binary search algorithm, including setting up tests to verify its correctness. Additionally, it hints at an alternative solution using decks and encourages viewers to explore this method.

What is the main goal of the problem discussed in the text?

Explain why the maximum value of a subarray can only increase as more elements are added.

What is the purpose of the 'length OK' function mentioned in the text?

Describe the binary search approach used to find the optimal subarray length.

What alternative method is suggested for solving the problem without binary search?