Design a simple banking system that supports creating customer accounts, depositing money, and transferring funds between accounts. Each operation is timestamped with increasing integer times to simulate a real-time system.

Implement the BankingSystem class:

• BankingSystem() Initializes the banking system with no accounts.

• boolean createAccount(int timestamp, String accountId) Creates a new account identified by accountId with a zero balance.

  • Returns true if the account is created successfully.
  • Returns false if an account with the same accountId already exists.

• int deposit(int timestamp, String accountId, int amount) Adds amount to the balance of the existing account accountId.

  • Returns the new balance if the account exists.
  • Returns -1 if accountId does not exist.