How would you combine percentage and exact split strategies in a system to handle complex billing scenarios?

hard📝 Trade-off Q9 of Q15

LLD - Design — Splitwise (Expense Sharing)

AConvert all splits to equal shares internally

BAllow users to specify exact amounts and percentages, then validate total matches

CForce all splits to be either exact or percentage, not both

DIgnore exact splits and use only percentage splits

Step-by-Step Solution

Solution:

Step 1: Support mixed input types
Allow users to input both exact amounts and percentages for flexibility.
Step 2: Validate combined splits
Ensure the sum of exact amounts plus percentage shares equals total amount.
Final Answer:
Allow users to specify exact amounts and percentages, then validate total matches -> Option B
Quick Check:
Mixed splits need validation for correctness [OK]

Quick Trick: Validate combined splits sum to total amount [OK]

Common Mistakes:

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