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The amount of money withdrawn or transferred from is less than or equal to the balance of the account.

Build 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. Produce true if the transaction was successful, false otherwise.
boolean deposit(int account, long money) Deposit money dollars into the account numbered account. Produce true if the transaction was successful, false otherwise.
boolean withdraw(int account, long money) Withdraw money dollars from the account numbered account. Produce 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); // produce 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); // produce 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); // produce true, it is valid to deposit $20 to account 5.
// Account 5 has $10 + $20 = $30.
bank.transfer(3, 4, 15); // produce false, the current balance of account 3 is $10, // so it is invalid to transfer $15 from it.
bank.withdraw(10, 50); // produce false, it is invalid because account 10 does not exist.

Constraints

n == balance.length
1 <= n, account, account1, account2 <= 10^5
0 <= balance[i], money <= 10^12
At most 10^4 calls will be made to each function transfer, deposit, withdraw.

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