For onsite, I was asked an algorithms question similar to this:\n\nUsers can refer each other to Robinhood. We want keep track of who is responsible for the most referrals and display the top users on a leaderboard.\n\nIf user A refers user B, and user B refers user C.  Then the leaderboard looks like this:\n\nUser A: 2 Referrals\nUser B: 1 Referrals\nUser C: 0 Referrals\n\nExplanation: User B has 1 referral for referring user C. User A has 2 referrals because they referred user B, and they also inherit the referral for user C since user B is one of their referrals.\n\nGiven a list of referrals (Example Input: [ ["A","B"]  ,  ["B", "C"] ], write a function that determines the leaderboard order.

For onsite, I was asked an algorithms question similar to this:\n\nUsers can refer each other to Robinhood. We want keep track of who is responsible for the mos