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If the net balances are: Dave: +60, Eva: -20, Frank: -40, what is the minimum number of transactions to settle debts?

medium📝 Analysis Q5 of 15
LLD - Design — Splitwise (Expense Sharing)
If the net balances are: Dave: +60, Eva: -20, Frank: -40, what is the minimum number of transactions to settle debts?
A3
B1
C2
D4
Step-by-Step Solution
Solution:

  1. Step 1: Understand net balances

    Dave should receive 60, Eva owes 20, Frank owes 40.

  2. Step 2: Pair debts to minimize transactions

    Eva pays Dave 20, Frank pays Dave 40, total 2 transactions.

  3. Final Answer:

    2 -> Option C

  4. Quick Check:

    Minimum transactions = 2 [OK]
Quick Trick: Sum negatives to match positives for minimal transactions [OK]
Common Mistakes:
  • Trying to split one debt into multiple transactions unnecessarily
  • Ignoring exact owed amounts
  • Assuming more transactions are always needed

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