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Reconcile bank account balances across two datasets

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StripeCodingLast asked Aug 2026
  1. From a list of balance records for bank accounts, return the latest balance of an account, in the output format the tests expect.
  2. A second dataset is added. Reconcile the two: for each account and month, compare the balances they report and output where they differ.

The format details are only visible by running the tests, so check them early.

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