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DIY: Accounts Merge

Understand how to merge multiple user accounts by detecting shared email addresses using Swift. This lesson helps you implement efficient account consolidation techniques, which are useful for handling real-world data scenarios. You will write a function to merge overlapping email records while maintaining sorted, distinct email lists.

Problem statement

In this challenge, you are given a 2D array called accounts. Each element in accounts[i] is an array of strings in which accounts[i][0] is a name and the remaining elements are email, representing the emails associated with that account.

Your task is to merge these accounts such that two accounts belonging to the same person ...