You have a group with net balances: Dave: +70, Emma: -50, Frank: -20. How would you apply the simplify debts algorithm to minimize transactions and what are the transactions?

hard📝 Trade-off Q15 of 15

LLD - Design — Splitwise (Expense Sharing)

AEmma pays Frank 20, Frank pays Dave 50 (2 transactions)

BDave pays Emma 50, Dave pays Frank 20 (2 transactions)

CEmma pays Dave 70, Frank pays Emma 0 (2 transactions)

DEmma pays Dave 50, Frank pays Dave 20 (2 transactions)

Step-by-Step Solution

Solution:

Step 1: Identify creditors and debtors
Dave is owed 70, Emma owes 50, Frank owes 20.
Step 2: Match debtors to creditor to minimize transactions
Emma pays Dave 50, Frank pays Dave 20, totaling 2 transactions.
Final Answer:
Emma pays Dave 50, Frank pays Dave 20 (2 transactions) -> Option D
Quick Check:
Debtors pay creditor directly = 2 transactions [OK]

Quick Trick: Debtors pay creditor amounts equal to their debts [OK]

Common Mistakes:

Reversing payer and receiver roles
Assigning incorrect amounts
Adding unnecessary transactions

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More LLD Quizzes

You have a group with net balances: Dave: +70, Emma: -50, Frank: -20. How would you apply the simplify debts algorithm to minimize transactions and what are the transactions?

Step 1: Identify creditors and debtors

Step 2: Match debtors to creditor to minimize transactions

Final Answer:

Quick Check:

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