DIY: Accounts Merge

Solve the interview question "Accounts Merge" in this lesson.

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 become one. To check if two accounts belong to ...