simple-bank-system

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Algorithms

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 <code>n</code> accounts numbered from <code>1</code> to <code>n</code>. The initial balance of each account is stored in a 0-indexed integer array <code>balance</code>, with the <code>(i + 1)th</code> account having an initial balance of <code>balance[i]</code>.

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

<ul>
	<li>The given account number(s) are between <code>1</code> and <code>n</code>, and</li>
	<li>The amount of money withdrawn or transferred from is less than or equal to the balance of the account.</li>
</ul>

Implement the <code>Bank</code> class:

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

&nbsp;
Example 1:

<pre>
Input
[&quot;Bank&quot;, &quot;withdraw&quot;, &quot;transfer&quot;, &quot;deposit&quot;, &quot;transfer&quot;, &quot;withdraw&quot;]
[[[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.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == balance.length</code></li>
	<li><code>1 &lt;= n, account, account1, account2 &lt;= 105</code></li>
	<li><code>0 &lt;= balance[i], money &lt;= 1012</code></li>
	<li>At most <code>104</code> calls will be made to each function <code>transfer</code>, <code>deposit</code>, <code>withdraw</code>.</li>
</ul>

Simple Bank System

Design an ATM Machine

design-an-atm-machine

设计一个 ATM 机器

Design

Array

Hash Table

Simulation

你的任务是为一个很受欢迎的银行设计一款程序，以自动化执行所有传入的交易（转账，存款和取款）。银行共有 <code>n</code> 个账户，编号从 <code>1</code> 到 <code>n</code> 。每个账号的初始余额存储在一个下标从 0 开始的整数数组 <code>balance</code>&nbsp;中，其中第 <code>(i + 1)</code> 个账户的初始余额是 <code>balance[i]</code> 。

请你执行所有 有效的 交易。如果满足下面全部条件，则交易 有效 ：

<ul>
	<li>指定的账户数量在 <code>1</code> 和 <code>n</code> 之间，且</li>
	<li>取款或者转账需要的钱的总数 小于或者等于 账户余额。</li>
</ul>

实现 <code>Bank</code> 类：

<ul>
	<li><code>Bank(long[] balance)</code> 使用下标从 0 开始的整数数组 <code>balance</code> 初始化该对象。</li>
	<li><code>boolean transfer(int account1, int account2, long money)</code> 从编号为&nbsp;<code>account1</code> 的账户向编号为 <code>account2</code> 的账户转帐 <code>money</code> 美元。如果交易成功，返回 <code>true</code> ，否则，返回 <code>false</code> 。</li>
	<li><code>boolean deposit(int account, long money)</code> 向编号为&nbsp;<code>account</code> 的账户存款 <code>money</code> 美元。如果交易成功，返回 <code>true</code> ；否则，返回 <code>false</code> 。</li>
	<li><code>boolean withdraw(int account, long money)</code> 从编号为 <code>account</code> 的账户取款 <code>money</code> 美元。如果交易成功，返回 <code>true</code> ；否则，返回 <code>false</code> 。</li>
</ul>

&nbsp;

示例：

<pre>
输入：
["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"]
[[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]
输出：
[null, true, true, true, false, false]

解释：
Bank bank = new Bank([10, 100, 20, 50, 30]);
bank.withdraw(3, 10); // 返回 true ，账户 3 的余额是 $20 ，所以可以取款 $10 。
 // 账户 3 余额为 $20 - $10 = $10 。
bank.transfer(5, 1, 20); // 返回 true ，账户 5 的余额是 $30 ，所以可以转账 $20 。
 // 账户 5 的余额为 $30 - $20 = $10 ，账户 1 的余额为 $10 + $20 = $30 。
bank.deposit(5, 20); // 返回 true ，可以向账户 5 存款 $20 。
 // 账户 5 的余额为 $10 + $20 = $30 。
bank.transfer(3, 4, 15); // 返回 false ，账户 3 的当前余额是 $10 。
 // 所以无法转账 $15 。
bank.withdraw(10, 50); // 返回 false ，交易无效，因为账户 10 并不存在。
</pre>

&nbsp;

提示：

<ul>
	<li><code>n == balance.length</code></li>
	<li><code>1 &lt;= n, account, account1, account2 &lt;= 105</code></li>
	<li><code>0 &lt;= balance[i], money &lt;= 1012</code></li>
	<li><code>transfer</code>, <code>deposit</code>, <code>withdraw</code> 三个函数，每个 最多调用 <code>104</code> 次</li>
</ul>