Design a system where users form groups, log shared expenses split equally, by exact amounts, or by percentage, maintain pairwise balances, and settle debts.
Design a group expense-splitting ledger: users form groups, any member can log a shared expense split equally, by exact amount, or by percentage, the system tracks running pairwise balances, and users can settle debts fully or partially.
Work in the provided coding workspace while explaining your decisions to the live interviewer. Validation may use inline tests, examples, comments, or a verbal walkthrough.
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