Banking System with Accepted Transfers, Part 1: Accounts and Payments

Q: How should I practice Banking System with Accepted Transfers, Part 1: Accounts and Payments?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Ramp online assessment problems in FastPrep.

Q: Is Banking System with Accepted Transfers, Part 1: Accounts and Payments associated with Ramp?

FastPrep tags this as a Ramp online assessment coding practice problem when the problem catalog has that company and stage context.

Ramp● EasyNEW GRADOA

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Problem statement

Implement a simplified banking system. The assessment is cumulative: after unlocking a new level, every operation from the current and previous levels remains available.

Query and Output Rules

Each query calls exactly one operation and includes a stringified millisecond timestamp.
Timestamps are unique, lie between 1 and 10^9, and appear in strictly increasing order.
Return one string result for every query, in input order.
Return the empty string when an operation has no successful scalar result, exactly as specified below.

Multipart Series

Level 1: Accounts and Payments

The banking system should support creating new accounts, depositing money, and withdrawing or paying money from accounts.

CREATE_ACCOUNT <timestamp> <accountId> creates a new account with the given accountId if it does not already exist. Return "true" if the account is created and "false" if it already exists.
DEPOSIT <timestamp> <accountId> <amount> deposits amount into the account. Return the account balance after processing the query, or the empty string if the account does not exist.
PAY <timestamp> <accountId> <amount> withdraws amount from the account. Return the account balance after processing the query. Return the empty string if the account does not exist or has insufficient funds.

Function

bankingAcceptedTransfersLevel1(queries: String[][]) → String[]

Examples

Example 1

queries = [["CREATE_ACCOUNT","1","account1"],["CREATE_ACCOUNT","2","account1"],["CREATE_ACCOUNT","3","account2"],["DEPOSIT","4","non-existing","2700"],["DEPOSIT","5","account1","2700"],["PAY","6","non-existing","2700"],["PAY","7","account1","2701"],["PAY","8","account1","200"]]return = ["true","false","true","","2700","","","2500"]

The duplicate account creation fails. Missing-account operations and an overdraw return empty strings. The final payment succeeds and leaves account1 with 2500.

Constraints

1 <= queries.length <= 500.
Every timestamp is a unique integer from 1 through 10^9, and queries are supplied in strictly increasing timestamp order.
Every query row is well formed and uses an operation available at this part.
Amounts and n are positive base-10 integers. Every balance and transaction total fits in a signed 64-bit integer.
Account identifiers are non-empty strings that do not contain commas or parentheses.