Solution: Reverse Pairs

Understand how to efficiently count reverse pairs in an integer array by applying the sort and search pattern. This lesson guides you through a divide-and-conquer approach using a modified merge sort combined with two-pointer scanning to identify pairs where one element is more than twice the other. You will learn to implement a recursive algorithm that sorts and counts reverse pairs, improving time complexity from brute force to O(n log n), while managing auxiliary space effectively.