#Algorithm

Implement a Least Recently Used (LRU) Cache. Consider the appropriate data structures for implementation. You will also need to provide a verbal explanation of your approach and write pseudocode before converting the pseudocode into working code and executing it.

Outline the steps needed to merge two linked lists that are sorted in ascending order.

Describe the divide-and-conquer approach used in binary search and provide an implementation in your chosen language.

Explain and implement the pointer reversal approach for reversing a singly linked list.

Given an array, reverse the elements from both sides starting from a specified index. For example, given `arr = [1,2,3,4,5]` and `ind = 2`, return `Array = [3,2,1,5,4]`. Explain your approach and any key considerations.