Banking Transaction Exceptions
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Virtu FinancialFULLTIMEOAProblem statement
Implement the behavior of a bank account that starts with a balance of 1500.0. Process the rows of operations from left to right while maintaining the current balance and a history of successful transactions.
Transaction records
Each successful deposit or withdrawal creates a transaction record containing its type, amount, and resulting balance. Its string representation is:
Type: {transaction_type}, Amount: {amount}, Balance: {balance}Amounts are positive whole numbers. Balances are displayed with a trailing .0.
Operations
Each row has one of these forms:
["deposit", amount]: Addamountto the balance and append a deposit record. Return["Transaction successful!", "Updated account balance: {balance}"].["withdraw", amount]: If the balance is sufficient, subtractamount, append a withdrawal record, and return the same two success messages. Otherwise return["InsufficientFundsError"], leave the balance unchanged, and do not modify history.["view_transaction_history"]: Return every successful transaction record in chronological order. Return an empty row when there is no history.
Return one string row for every operation, in the same order.
Function
simulateBankingTransactions(operations: String[][]) → String[][]Examples
Example 1
operations = [["deposit","200"],["withdraw","500"],["view_transaction_history"]]return = [["Transaction successful!","Updated account balance: 1700.0"],["Transaction successful!","Updated account balance: 1200.0"],["Type: deposit, Amount: 200, Balance: 1700.0","Type: withdraw, Amount: 500, Balance: 1200.0"]]The deposit raises the balance from 1500.0 to 1700.0. The withdrawal then lowers it to 1200.0. The final operation returns both successful transaction records in order.
Example 2
operations = [["withdraw","1600"],["view_transaction_history"]]return = [["InsufficientFundsError"],[]]The account has only 1500.0, so the withdrawal fails without changing the balance or history. Viewing history therefore returns an empty row.
Example 3
operations = [["view_transaction_history"],["deposit","50"],["view_transaction_history"],["withdraw","1550"],["view_transaction_history"]]return = [[],["Transaction successful!","Updated account balance: 1550.0"],["Type: deposit, Amount: 50, Balance: 1550.0"],["Transaction successful!","Updated account balance: 0.0"],["Type: deposit, Amount: 50, Balance: 1550.0","Type: withdraw, Amount: 1550, Balance: 0.0"]]The first history view is empty. After the deposit, history contains one record. Withdrawing exactly the full balance succeeds, leaves 0.0, and adds the second record.
Constraints
1 <= operations.length <= 2000- Each operation is exactly one of
deposit,withdraw, orview_transaction_history. - Deposit and withdrawal rows contain a base-10 positive integer amount string in the range
1through10^9. - The running balance always fits in a signed 64-bit integer.
- A history view does not change the account state.