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g2001_2100.s2043_simple_bank_system.readme.md Maven / Gradle / Ivy

2043\. Simple Bank System

Medium

You have been tasked with writing a program for a popular bank that will automate all its incoming transactions (transfer, deposit, and withdraw). The bank has `n` accounts numbered from `1` to `n`. The initial balance of each account is stored in a **0-indexed** integer array `balance`, with the (i + 1)th account having an initial balance of `balance[i]`.

Execute all the **valid** transactions. A transaction is **valid** if:

*   The given account number(s) are between `1` and `n`, and
*   The amount of money withdrawn or transferred from is **less than or equal** to the balance of the account.

Implement the `Bank` class:

*   `Bank(long[] balance)` Initializes the object with the **0-indexed** integer array `balance`.
*   `boolean transfer(int account1, int account2, long money)` Transfers `money` dollars from the account numbered `account1` to the account numbered `account2`. Return `true` if the transaction was successful, `false` otherwise.
*   `boolean deposit(int account, long money)` Deposit `money` dollars into the account numbered `account`. Return `true` if the transaction was successful, `false` otherwise.
*   `boolean withdraw(int account, long money)` Withdraw `money` dollars from the account numbered `account`. Return `true` if the transaction was successful, `false` otherwise.

**Example 1:**

**Input** ["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"] [[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]

**Output:** [null, true, true, true, false, false]

**Explanation:** 

Bank bank = new Bank([10, 100, 20, 50, 30]); 

bank.withdraw(3, 10); // return true, account 3 has a balance of $20, so it is valid to withdraw $10. 
                       // Account 3 has $20 - $10 = $10. 

bank.transfer(5, 1, 20); // return true, account 5 has a balance of $30, so it is valid to transfer $20.
                         // Account 5 has $30 - $20 = $10, and account 1 has $10 + $20 = $30. 

bank.deposit(5, 20); // return true, it is valid to deposit $20 to account 5. 
                     // Account 5 has $10 + $20 = $30.

bank.transfer(3, 4, 15); // return false, the current balance of account 3 is $10, 
                         // so it is invalid to transfer $15 from it.

bank.withdraw(10, 50); // return false, it is invalid because account 10 does not exist.

**Constraints:**

*   `n == balance.length`
*   1 <= n, account, account1, account2 <= 105
*   0 <= balance[i], money <= 1012
*   At most 104 calls will be made to **each** function `transfer`, `deposit`, `withdraw`.