LLD - Design — Splitwise (Expense Sharing)
If a balance calculation algorithm processes transactions [10, -5, -15, 20] starting from zero, what is the resulting balance?
If a balance calculation algorithm processes transactions [10, -5, -15, 20] starting from zero, what is the resulting balance?
medium📝 Analysis Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate sum of transactions
Sum = 10 - 5 - 15 + 20 = 10.Step 2: Add to initial balance
Initial balance is zero, so final balance = 10.Final Answer:
10 -> Option BQuick Check:
Final balance = 10 [OK]
Quick Trick: Sum transactions carefully including negatives [OK]
Common Mistakes:
- Adding negatives as positives
- Skipping some transactions
- Misordering operations
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