{ "data": { "question": { "questionId": "2169", "questionFrontendId": "2043", "categoryTitle": "Algorithms", "boundTopicId": 1048463, "title": "Simple Bank System", "titleSlug": "simple-bank-system", "content": "

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].

\n\n

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

\n\n\n\n

Implement the Bank class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"]\n[[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]\nOutput\n[null, true, true, true, false, false]\n\nExplanation\nBank bank = new Bank([10, 100, 20, 50, 30]);\nbank.withdraw(3, 10);    // return true, account 3 has a balance of $20, so it is valid to withdraw $10.\n                         // Account 3 has $20 - $10 = $10.\nbank.transfer(5, 1, 20); // return true, account 5 has a balance of $30, so it is valid to transfer $20.\n                         // Account 5 has $30 - $20 = $10, and account 1 has $10 + $20 = $30.\nbank.deposit(5, 20);     // return true, it is valid to deposit $20 to account 5.\n                         // Account 5 has $10 + $20 = $30.\nbank.transfer(3, 4, 15); // return false, the current balance of account 3 is $10,\n                         // so it is invalid to transfer $15 from it.\nbank.withdraw(10, 50);   // return false, it is invalid because account 10 does not exist.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "简易银行系统", "translatedContent": "

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] 。

\n\n

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 ：

\n\n\n\n

实现 Bank 类：

\n\n\n\n

 

\n\n

示例：

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

 

\n\n

提示：

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"__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Bank {\npublic:\n Bank(vector& balance) {\n\n }\n \n bool transfer(int account1, int account2, long long money) {\n\n }\n \n bool deposit(int account, long long money) {\n\n }\n \n bool withdraw(int account, long long money) {\n\n }\n};\n\n/**\n * Your Bank object will be instantiated and called as such:\n * Bank* obj = new Bank(balance);\n * bool param_1 = obj->transfer(account1,account2,money);\n * bool param_2 = obj->deposit(account,money);\n * bool param_3 = obj->withdraw(account,money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class Bank {\n\n public Bank(long[] balance) {\n\n }\n \n public boolean transfer(int account1, int account2, long money) {\n\n }\n \n public boolean deposit(int account, long money) {\n\n }\n \n public boolean withdraw(int account, long money) {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * Bank obj = new Bank(balance);\n * boolean param_1 = obj.transfer(account1,account2,money);\n * boolean param_2 = obj.deposit(account,money);\n * boolean param_3 = obj.withdraw(account,money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class Bank(object):\n\n def __init__(self, balance):\n \"\"\"\n :type balance: List[int]\n \"\"\"\n\n\n def transfer(self, account1, account2, money):\n \"\"\"\n :type account1: int\n :type account2: int\n :type money: int\n :rtype: bool\n \"\"\"\n\n\n def deposit(self, account, money):\n \"\"\"\n :type account: int\n :type money: int\n :rtype: bool\n \"\"\"\n\n\n def withdraw(self, account, money):\n \"\"\"\n :type account: int\n :type money: int\n :rtype: bool\n \"\"\"\n\n\n\n# Your Bank object will be instantiated and called as such:\n# obj = Bank(balance)\n# param_1 = obj.transfer(account1,account2,money)\n# param_2 = obj.deposit(account,money)\n# param_3 = obj.withdraw(account,money)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class Bank:\n\n def __init__(self, balance: List[int]):\n\n\n def transfer(self, account1: int, account2: int, money: int) -> bool:\n\n\n def deposit(self, account: int, money: int) -> bool:\n\n\n def withdraw(self, account: int, money: int) -> bool:\n\n\n\n# Your Bank object will be instantiated and called as such:\n# obj = Bank(balance)\n# param_1 = obj.transfer(account1,account2,money)\n# param_2 = obj.deposit(account,money)\n# param_3 = obj.withdraw(account,money)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} Bank;\n\n\nBank* bankCreate(long long* balance, int balanceSize) {\n\n}\n\nbool bankTransfer(Bank* obj, int account1, int account2, long long money) {\n\n}\n\nbool bankDeposit(Bank* obj, int account, long long money) {\n\n}\n\nbool bankWithdraw(Bank* obj, int account, long long money) {\n\n}\n\nvoid bankFree(Bank* obj) {\n\n}\n\n/**\n * Your Bank struct will be instantiated and called as such:\n * Bank* obj = bankCreate(balance, balanceSize);\n * bool param_1 = bankTransfer(obj, account1, account2, money);\n \n * bool param_2 = bankDeposit(obj, account, money);\n \n * bool param_3 = bankWithdraw(obj, account, money);\n \n * bankFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Bank {\n\n public Bank(long[] balance) {\n\n }\n \n public bool Transfer(int account1, int account2, long money) {\n\n }\n \n public bool Deposit(int account, long money) {\n\n }\n \n public bool Withdraw(int account, long money) {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * Bank obj = new Bank(balance);\n * bool param_1 = obj.Transfer(account1,account2,money);\n * bool param_2 = obj.Deposit(account,money);\n * bool param_3 = obj.Withdraw(account,money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number[]} balance\n */\nvar Bank = function(balance) {\n\n};\n\n/** \n * @param {number} account1 \n * @param {number} account2 \n * @param {number} money\n * @return {boolean}\n */\nBank.prototype.transfer = function(account1, account2, money) {\n\n};\n\n/** \n * @param {number} account \n * @param {number} money\n * @return {boolean}\n */\nBank.prototype.deposit = function(account, money) {\n\n};\n\n/** \n * @param {number} account \n * @param {number} money\n * @return {boolean}\n */\nBank.prototype.withdraw = function(account, money) {\n\n};\n\n/**\n * Your Bank object will be instantiated and called as such:\n * var obj = new Bank(balance)\n * var param_1 = obj.transfer(account1,account2,money)\n * var param_2 = obj.deposit(account,money)\n * var param_3 = obj.withdraw(account,money)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class Bank\n\n=begin\n :type balance: Integer[]\n=end\n def initialize(balance)\n\n end\n\n\n=begin\n :type account1: Integer\n :type account2: Integer\n :type money: Integer\n :rtype: Boolean\n=end\n def transfer(account1, account2, money)\n\n end\n\n\n=begin\n :type account: Integer\n :type money: Integer\n :rtype: Boolean\n=end\n def deposit(account, money)\n\n end\n\n\n=begin\n :type account: Integer\n :type money: Integer\n :rtype: Boolean\n=end\n def withdraw(account, money)\n\n end\n\n\nend\n\n# Your Bank object will be instantiated and called as such:\n# obj = Bank.new(balance)\n# param_1 = obj.transfer(account1, account2, money)\n# param_2 = obj.deposit(account, money)\n# param_3 = obj.withdraw(account, money)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass Bank {\n\n init(_ balance: [Int]) {\n\n }\n \n func transfer(_ account1: Int, _ account2: Int, _ money: Int) -> Bool {\n\n }\n \n func deposit(_ account: Int, _ money: Int) -> Bool {\n\n }\n \n func withdraw(_ account: Int, _ money: Int) -> Bool {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * let obj = Bank(balance)\n * let ret_1: Bool = obj.transfer(account1, account2, money)\n * let ret_2: Bool = obj.deposit(account, money)\n * let ret_3: Bool = obj.withdraw(account, money)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type Bank struct {\n\n}\n\n\nfunc Constructor(balance []int64) Bank {\n\n}\n\n\nfunc (this *Bank) Transfer(account1 int, account2 int, money int64) bool {\n\n}\n\n\nfunc (this *Bank) Deposit(account int, money int64) bool {\n\n}\n\n\nfunc (this *Bank) Withdraw(account int, money int64) bool {\n\n}\n\n\n/**\n * Your Bank object will be instantiated and called as such:\n * obj := Constructor(balance);\n * param_1 := obj.Transfer(account1,account2,money);\n * param_2 := obj.Deposit(account,money);\n * param_3 := obj.Withdraw(account,money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class Bank(_balance: Array[Long]) {\n\n def transfer(account1: Int, account2: Int, money: Long): Boolean = {\n\n }\n\n def deposit(account: Int, money: Long): Boolean = {\n\n }\n\n def withdraw(account: Int, money: Long): Boolean = {\n\n }\n\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * var obj = new Bank(balance)\n * var param_1 = obj.transfer(account1,account2,money)\n * var param_2 = obj.deposit(account,money)\n * var param_3 = obj.withdraw(account,money)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Bank(balance: LongArray) {\n\n fun transfer(account1: Int, account2: Int, money: Long): Boolean {\n\n }\n\n fun deposit(account: Int, money: Long): Boolean {\n\n }\n\n fun withdraw(account: Int, money: Long): Boolean {\n\n }\n\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * var obj = Bank(balance)\n * var param_1 = obj.transfer(account1,account2,money)\n * var param_2 = obj.deposit(account,money)\n * var param_3 = obj.withdraw(account,money)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct Bank {\n\n}\n\n\n/**\n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Bank {\n\n fn new(balance: Vec) -> Self {\n\n }\n \n fn transfer(&self, account1: i32, account2: i32, money: i64) -> bool {\n\n }\n \n fn deposit(&self, account: i32, money: i64) -> bool {\n\n }\n \n fn withdraw(&self, account: i32, money: i64) -> bool {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * let obj = Bank::new(balance);\n * let ret_1: bool = obj.transfer(account1, account2, money);\n * let ret_2: bool = obj.deposit(account, money);\n * let ret_3: bool = obj.withdraw(account, money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Bank {\n /**\n * @param Integer[] $balance\n */\n function __construct($balance) {\n\n }\n\n /**\n * @param Integer $account1\n * @param Integer $account2\n * @param Integer $money\n * @return Boolean\n */\n function transfer($account1, $account2, $money) {\n\n }\n\n /**\n * @param Integer $account\n * @param Integer $money\n * @return Boolean\n */\n function deposit($account, $money) {\n\n }\n\n /**\n * @param Integer $account\n * @param Integer $money\n * @return Boolean\n */\n function withdraw($account, $money) {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * $obj = Bank($balance);\n * $ret_1 = $obj->transfer($account1, $account2, $money);\n * $ret_2 = $obj->deposit($account, $money);\n * $ret_3 = $obj->withdraw($account, $money);\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class Bank {\n constructor(balance: number[]) {\n\n }\n\n transfer(account1: number, account2: number, money: number): boolean {\n\n }\n\n deposit(account: number, money: number): boolean {\n\n }\n\n withdraw(account: number, money: number): boolean {\n\n }\n}\n\n/**\n * Your Bank object will be instantiated and called as such:\n * var obj = new Bank(balance)\n * var param_1 = obj.transfer(account1,account2,money)\n * var param_2 = obj.deposit(account,money)\n * var param_3 = obj.withdraw(account,money)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define bank%\n (class object%\n (super-new)\n\n ; balance : (listof exact-integer?)\n (init-field\n balance)\n \n ; transfer : exact-integer? exact-integer? exact-integer? -> boolean?\n (define/public (transfer account1 account2 money)\n\n )\n ; deposit : exact-integer? exact-integer? -> boolean?\n (define/public (deposit account money)\n\n )\n ; withdraw : exact-integer? exact-integer? -> boolean?\n (define/public (withdraw account money)\n\n )))\n\n;; Your bank% object will be instantiated and called as such:\n;; (define obj (new bank% [balance balance]))\n;; (define param_1 (send obj transfer account1 account2 money))\n;; (define param_2 (send obj deposit account money))\n;; (define param_3 (send obj withdraw account money))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec bank_init_(Balance :: [integer()]) -> any().\nbank_init_(Balance) ->\n .\n\n-spec bank_transfer(Account1 :: integer(), Account2 :: integer(), Money :: integer()) -> boolean().\nbank_transfer(Account1, Account2, Money) ->\n .\n\n-spec bank_deposit(Account :: integer(), Money :: integer()) -> boolean().\nbank_deposit(Account, Money) ->\n .\n\n-spec bank_withdraw(Account :: integer(), Money :: integer()) -> boolean().\nbank_withdraw(Account, Money) ->\n .\n\n\n%% Your functions will be called as such:\n%% bank_init_(Balance),\n%% Param_1 = bank_transfer(Account1, Account2, Money),\n%% Param_2 = bank_deposit(Account, Money),\n%% Param_3 = bank_withdraw(Account, Money),\n\n%% bank_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule Bank do\n @spec init_(balance :: [integer]) :: any\n def init_(balance) do\n\n end\n\n @spec transfer(account1 :: integer, account2 :: integer, money :: integer) :: boolean\n def transfer(account1, account2, money) do\n\n end\n\n @spec deposit(account :: integer, money :: integer) :: boolean\n def deposit(account, money) do\n\n end\n\n @spec withdraw(account :: integer, money :: integer) :: boolean\n def withdraw(account, money) do\n\n end\nend\n\n# Your functions will be called as such:\n# Bank.init_(balance)\n# param_1 = Bank.transfer(account1, account2, money)\n# param_2 = Bank.deposit(account, money)\n# param_3 = Bank.withdraw(account, money)\n\n# Bank.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"32.2K\", \"totalSubmission\": \"47.6K\", \"totalAcceptedRaw\": 32154, \"totalSubmissionRaw\": 47585, \"acRate\": \"67.6%\"}", "hints": [ "How do you determine if a transaction will fail?", "Simply apply the operations if the transaction is valid." ], "solution": null, "status": null, "sampleTestCase": "[\"Bank\",\"withdraw\",\"transfer\",\"deposit\",\"transfer\",\"withdraw\"]\n[[[10,100,20,50,30]],[3,10],[5,1,20],[5,20],[3,4,15],[10,50]]", "metaData": "{\n \"classname\": \"Bank\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"long[]\",\n \"name\": \"balance\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"account1\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"account2\"\n },\n {\n \"type\": \"long\",\n \"name\": \"money\"\n }\n ],\n \"name\": \"transfer\",\n \"return\": {\n \"type\": \"boolean\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"account\"\n },\n {\n \"type\": \"long\",\n \"name\": \"money\"\n }\n ],\n \"name\": \"deposit\",\n \"return\": {\n \"type\": \"boolean\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"account\"\n },\n {\n \"type\": \"long\",\n \"name\": \"money\"\n }\n ],\n \"name\": \"withdraw\",\n \"return\": {\n \"type\": \"boolean\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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