#2043

Simple Bank System

specialist · 605 · lc medium +29 · 69.8% accepted · 631 likes · top 78%

Description

A bank has n accounts (labeled 1 to n); account i+1 starts with balance[i] dollars. A transaction is valid when account numbers are in range and the withdrawn/transferred amount does not exceed the account's balance. Implement the Bank class:
- Bank(long[] balance) — initialize balances.
- boolean transfer(int account1, int account2, long money) — move money from account1 to account2; return success.
- boolean deposit(int account, long money) — add money to account; return success.
- boolean withdraw(int account, long money) — remove money from account; return success.

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]

Example 2:

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.

Code

class Bank:

    def __init__(self, balance: List[int]):
        

    def transfer(self, account1: int, account2: int, money: int) -> bool:
        

    def deposit(self, account: int, money: int) -> bool:
        

    def withdraw(self, account: int, money: int) -> bool:
        


# Your Bank object will be instantiated and called as such:
# obj = Bank(balance)
# param_1 = obj.transfer(account1,account2,money)
# param_2 = obj.deposit(account,money)
# param_3 = obj.withdraw(account,money)

class Bank:

    def __init__(self, balance: List[int]):
        

    def transfer(self, account1: int, account2: int, money: int) -> bool:
        

    def deposit(self, account: int, money: int) -> bool:
        

    def withdraw(self, account: int, money: int) -> bool:
        


# Your Bank object will be instantiated and called as such:
# obj = Bank(balance)
# param_1 = obj.transfer(account1,account2,money)
# param_2 = obj.deposit(account,money)
# param_3 = obj.withdraw(account,money)