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113 lines
4.5 KiB
Markdown
113 lines
4.5 KiB
Markdown
# [2043. Simple Bank System](https://leetcode.com/problems/simple-bank-system/)
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## 题目
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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].
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Execute all the valid transactions. A transaction is valid if:
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- The given account number(s) are between 1 and n, and
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- The amount of money withdrawn or transferred from is less than or equal to the balance of the account.
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Implement the Bank class:
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- Bank(long[] balance) Initializes the object with the 0-indexed integer array balance.
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- 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.
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- boolean deposit(int account, long money) Deposit money dollars into the account numbered account. Return true if the transaction was successful, false otherwise.
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- boolean withdraw(int account, long money) Withdraw money dollars from the account numbered account. Return true if the transaction was successful, false otherwise.
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**Example 1:**
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Input
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["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"]
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[[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]
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Output
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[null, true, true, true, false, false]
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Explanation
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Bank bank = new Bank([10, 100, 20, 50, 30]);
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bank.withdraw(3, 10); // return true, account 3 has a balance of $20, so it is valid to withdraw $10.
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// Account 3 has $20 - $10 = $10.
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bank.transfer(5, 1, 20); // return true, account 5 has a balance of $30, so it is valid to transfer $20.
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// Account 5 has $30 - $20 = $10, and account 1 has $10 + $20 = $30.
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bank.deposit(5, 20); // return true, it is valid to deposit $20 to account 5.
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// Account 5 has $10 + $20 = $30.
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bank.transfer(3, 4, 15); // return false, the current balance of account 3 is $10,
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// so it is invalid to transfer $15 from it.
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bank.withdraw(10, 50); // return false, it is invalid because account 10 does not exist.
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**Constraints:**
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- n == balance.length
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- 1 <= n, account, account1, account2 <= 100000
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- 0 <= balance[i], money <= 1000000000000
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- At most 104 calls will be made to each function transfer, deposit, withdraw.
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## 题目大意
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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 n 个账户，编号从 1 到 n 。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 balance 中，其中第 (i + 1) 个账户的初始余额是 balance[i] 。
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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 ：
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- 指定的账户数量在 1 和 n 之间，且
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- 取款或者转账需要的钱的总数 小于或者等于 账户余额。
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实现 Bank 类：
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- Bank(long[] balance) 使用下标从 0 开始的整数数组 balance 初始化该对象。
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- boolean transfer(int account1, int account2, long money) 从编号为 account1 的账户向编号为 account2 的账户转帐 money 美元。如果交易成功，返回 true ，否则，返回 false 。
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- boolean deposit(int account, long money) 向编号为 account 的账户存款 money 美元。如果交易成功，返回 true ；否则，返回 false 。
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- boolean withdraw(int account, long money) 从编号为 account 的账户取款 money 美元。如果交易成功，返回 true ；否则，返回 false 。
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## 解题思路
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根据题意进行简单模拟
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# 代码
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```go
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package leetcode
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type Bank struct {
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accounts []int64
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n int
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}
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func Constructor(balance []int64) Bank {
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return Bank{
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accounts: balance,
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n: len(balance),
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}
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}
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func (this *Bank) Transfer(account1 int, account2 int, money int64) bool {
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if account1 > this.n || account2 > this.n {
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return false
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}
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if this.accounts[account1-1] < money {
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return false
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}
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this.accounts[account1-1] -= money
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this.accounts[account2-1] += money
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return true
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}
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func (this *Bank) Deposit(account int, money int64) bool {
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if account > this.n {
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return false
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}
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this.accounts[account-1] += money
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return true
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}
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func (this *Bank) Withdraw(account int, money int64) bool {
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if account > this.n {
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return false
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}
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if this.accounts[account-1] < money {
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return false
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}
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this.accounts[account-1] -= money
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return true
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}
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``` |