{ "data": { "question": { "questionId": "1459", "questionFrontendId": "1357", "categoryTitle": "Algorithms", "boundTopicId": 102331, "title": "Apply Discount Every n Orders", "titleSlug": "apply-discount-every-n-orders", "content": "

There is a supermarket that is frequented by many customers. The products sold at the supermarket are represented as two parallel integer arrays products and prices, where the ith product has an ID of products[i] and a price of prices[i].

\n\n

When a customer is paying, their bill is represented as two parallel integer arrays product and amount, where the jth product they purchased has an ID of product[j], and amount[j] is how much of the product they bought. Their subtotal is calculated as the sum of each amount[j] * (price of the jth product).

\n\n

The supermarket decided to have a sale. Every nth customer paying for their groceries will be given a percentage discount. The discount amount is given by discount, where they will be given discount percent off their subtotal. More formally, if their subtotal is bill, then they would actually pay bill * ((100 - discount) / 100).

\n\n

Implement the Cashier class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["Cashier","getBill","getBill","getBill","getBill","getBill","getBill","getBill"]\n[[3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]],[[1,2],[1,2]],[[3,7],[10,10]],[[1,2,3,4,5,6,7],[1,1,1,1,1,1,1]],[[4],[10]],[[7,3],[10,10]],[[7,5,3,1,6,4,2],[10,10,10,9,9,9,7]],[[2,3,5],[5,3,2]]]\nOutput\n[null,500.0,4000.0,800.0,4000.0,4000.0,7350.0,2500.0]\nExplanation\nCashier cashier = new Cashier(3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]);\ncashier.getBill([1,2],[1,2]);                        // return 500.0. 1st customer, no discount.\n                                                     // bill = 1 * 100 + 2 * 200 = 500.\ncashier.getBill([3,7],[10,10]);                      // return 4000.0. 2nd customer, no discount.\n                                                     // bill = 10 * 300 + 10 * 100 = 4000.\ncashier.getBill([1,2,3,4,5,6,7],[1,1,1,1,1,1,1]);    // return 800.0. 3rd customer, 50% discount.\n                                                     // Original bill = 1600\n                                                     // Actual bill = 1600 * ((100 - 50) / 100) = 800.\ncashier.getBill([4],[10]);                           // return 4000.0. 4th customer, no discount.\ncashier.getBill([7,3],[10,10]);                      // return 4000.0. 5th customer, no discount.\ncashier.getBill([7,5,3,1,6,4,2],[10,10,10,9,9,9,7]); // return 7350.0. 6th customer, 50% discount.\n                                                     // Original bill = 14700, but with\n                                                     // Actual bill = 14700 * ((100 - 50) / 100) = 7350.\ncashier.getBill([2,3,5],[5,3,2]);                    // return 2500.0.  6th customer, no discount.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "每隔 n 个顾客打折", "translatedContent": "

超市里正在举行打折活动，每隔 n 个顾客会得到 discount 的折扣。

\n\n

超市里有一些商品，第 i 种商品为 products[i] 且每件单品的价格为 prices[i] 。

\n\n

结账系统会统计顾客的数目，每隔 n 个顾客结账时，该顾客的账单都会打折，折扣为 discount （也就是如果原本账单为 x ，那么实际金额会变成 x - (discount * x) / 100 ），然后系统会重新开始计数。

\n\n

顾客会购买一些商品， product[i] 是顾客购买的第 i 种商品， amount[i] 是对应的购买该种商品的数目。

\n\n

请你实现 Cashier 类：

\n\n\n\n

 

\n\n

示例 1：

\n\n
输入\n["Cashier","getBill","getBill","getBill","getBill","getBill","getBill","getBill"]\n[[3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]],[[1,2],[1,2]],[[3,7],[10,10]],[[1,2,3,4,5,6,7],[1,1,1,1,1,1,1]],[[4],[10]],[[7,3],[10,10]],[[7,5,3,1,6,4,2],[10,10,10,9,9,9,7]],[[2,3,5],[5,3,2]]]\n输出\n[null,500.0,4000.0,800.0,4000.0,4000.0,7350.0,2500.0]\n解释\nCashier cashier = new Cashier(3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]);\ncashier.getBill([1,2],[1,2]);                        // 返回 500.0, 账单金额为 = 1 * 100 + 2 * 200 = 500.\ncashier.getBill([3,7],[10,10]);                      // 返回 4000.0\ncashier.getBill([1,2,3,4,5,6,7],[1,1,1,1,1,1,1]);    // 返回 800.0 ，账单原本为 1600.0 ，但由于该顾客是第三位顾客，他将得到 50% 的折扣，所以实际金额为 1600 - 1600 * (50 / 100) = 800 。\ncashier.getBill([4],[10]);                           // 返回 4000.0\ncashier.getBill([7,3],[10,10]);                      // 返回 4000.0\ncashier.getBill([7,5,3,1,6,4,2],[10,10,10,9,9,9,7]); // 返回 7350.0 ，账单原本为 14700.0 ，但由于系统计数再次达到三，该顾客将得到 50% 的折扣，实际金额为 7350.0 。\ncashier.getBill([2,3,5],[5,3,2]);                    // 返回 2500.0\n
\n\n

 

\n\n

提示：

\n\n\n", "isPaidOnly": false, "difficulty": "Medium", "likes": 15, "dislikes": 0, "isLiked": null, "similarQuestions": "[]", "contributors": [], "langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"ruby\": false, \"bash\": false, \"swift\": false, \"golang\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"kotlin\": false, \"rust\": false, \"php\": false, \"typescript\": false, \"racket\": false, \"erlang\": false, \"elixir\": false}", "topicTags": [ { "name": "Design", "slug": "design", "translatedName": "设计", "__typename": "TopicTagNode" }, { "name": "Array", "slug": "array", "translatedName": "数组", "__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": "哈希表", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Cashier {\npublic:\n Cashier(int n, int discount, vector& products, vector& prices) {\n\n }\n \n double getBill(vector product, vector amount) {\n\n }\n};\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * Cashier* obj = new Cashier(n, discount, products, prices);\n * double param_1 = obj->getBill(product,amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class Cashier {\n\n public Cashier(int n, int discount, int[] products, int[] prices) {\n\n }\n \n public double getBill(int[] product, int[] amount) {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * Cashier obj = new Cashier(n, discount, products, prices);\n * double param_1 = obj.getBill(product,amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class Cashier(object):\n\n def __init__(self, n, discount, products, prices):\n \"\"\"\n :type n: int\n :type discount: int\n :type products: List[int]\n :type prices: List[int]\n \"\"\"\n\n\n def getBill(self, product, amount):\n \"\"\"\n :type product: List[int]\n :type amount: List[int]\n :rtype: float\n \"\"\"\n\n\n\n# Your Cashier object will be instantiated and called as such:\n# obj = Cashier(n, discount, products, prices)\n# param_1 = obj.getBill(product,amount)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class Cashier:\n\n def __init__(self, n: int, discount: int, products: List[int], prices: List[int]):\n\n\n def getBill(self, product: List[int], amount: List[int]) -> float:\n\n\n\n# Your Cashier object will be instantiated and called as such:\n# obj = Cashier(n, discount, products, prices)\n# param_1 = obj.getBill(product,amount)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} Cashier;\n\n\nCashier* cashierCreate(int n, int discount, int* products, int productsSize, int* prices, int pricesSize) {\n\n}\n\ndouble cashierGetBill(Cashier* obj, int* product, int productSize, int* amount, int amountSize) {\n\n}\n\nvoid cashierFree(Cashier* obj) {\n\n}\n\n/**\n * Your Cashier struct will be instantiated and called as such:\n * Cashier* obj = cashierCreate(n, discount, products, productsSize, prices, pricesSize);\n * double param_1 = cashierGetBill(obj, product, productSize, amount, amountSize);\n \n * cashierFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Cashier {\n\n public Cashier(int n, int discount, int[] products, int[] prices) {\n\n }\n \n public double GetBill(int[] product, int[] amount) {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * Cashier obj = new Cashier(n, discount, products, prices);\n * double param_1 = obj.GetBill(product,amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} n\n * @param {number} discount\n * @param {number[]} products\n * @param {number[]} prices\n */\nvar Cashier = function(n, discount, products, prices) {\n\n};\n\n/** \n * @param {number[]} product \n * @param {number[]} amount\n * @return {number}\n */\nCashier.prototype.getBill = function(product, amount) {\n\n};\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * var obj = new Cashier(n, discount, products, prices)\n * var param_1 = obj.getBill(product,amount)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class Cashier\n\n=begin\n :type n: Integer\n :type discount: Integer\n :type products: Integer[]\n :type prices: Integer[]\n=end\n def initialize(n, discount, products, prices)\n\n end\n\n\n=begin\n :type product: Integer[]\n :type amount: Integer[]\n :rtype: Float\n=end\n def get_bill(product, amount)\n\n end\n\n\nend\n\n# Your Cashier object will be instantiated and called as such:\n# obj = Cashier.new(n, discount, products, prices)\n# param_1 = obj.get_bill(product, amount)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass Cashier {\n\n init(_ n: Int, _ discount: Int, _ products: [Int], _ prices: [Int]) {\n\n }\n \n func getBill(_ product: [Int], _ amount: [Int]) -> Double {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * let obj = Cashier(n, discount, products, prices)\n * let ret_1: Double = obj.getBill(product, amount)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type Cashier struct {\n\n}\n\n\nfunc Constructor(n int, discount int, products []int, prices []int) Cashier {\n\n}\n\n\nfunc (this *Cashier) GetBill(product []int, amount []int) float64 {\n\n}\n\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * obj := Constructor(n, discount, products, prices);\n * param_1 := obj.GetBill(product,amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class Cashier(_n: Int, _discount: Int, _products: Array[Int], _prices: Array[Int]) {\n\n def getBill(product: Array[Int], amount: Array[Int]): Double = {\n\n }\n\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * var obj = new Cashier(n, discount, products, prices)\n * var param_1 = obj.getBill(product,amount)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Cashier(n: Int, discount: Int, products: IntArray, prices: IntArray) {\n\n fun getBill(product: IntArray, amount: IntArray): Double {\n\n }\n\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * var obj = Cashier(n, discount, products, prices)\n * var param_1 = obj.getBill(product,amount)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct Cashier {\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 Cashier {\n\n fn new(n: i32, discount: i32, products: Vec, prices: Vec) -> Self {\n\n }\n \n fn get_bill(&self, product: Vec, amount: Vec) -> f64 {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * let obj = Cashier::new(n, discount, products, prices);\n * let ret_1: f64 = obj.get_bill(product, amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Cashier {\n /**\n * @param Integer $n\n * @param Integer $discount\n * @param Integer[] $products\n * @param Integer[] $prices\n */\n function __construct($n, $discount, $products, $prices) {\n\n }\n\n /**\n * @param Integer[] $product\n * @param Integer[] $amount\n * @return Float\n */\n function getBill($product, $amount) {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * $obj = Cashier($n, $discount, $products, $prices);\n * $ret_1 = $obj->getBill($product, $amount);\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class Cashier {\n constructor(n: number, discount: number, products: number[], prices: number[]) {\n\n }\n\n getBill(product: number[], amount: number[]): number {\n\n }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * var obj = new Cashier(n, discount, products, prices)\n * var param_1 = obj.getBill(product,amount)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define cashier%\n (class object%\n (super-new)\n\n ; n : exact-integer?\n\n ; discount : exact-integer?\n\n ; products : (listof exact-integer?)\n\n ; prices : (listof exact-integer?)\n (init-field\n n\n discount\n products\n prices)\n \n ; get-bill : (listof exact-integer?) (listof exact-integer?) -> flonum?\n (define/public (get-bill product amount)\n\n )))\n\n;; Your cashier% object will be instantiated and called as such:\n;; (define obj (new cashier% [n n] [discount discount] [products products] [prices prices]))\n;; (define param_1 (send obj get-bill product amount))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec cashier_init_(N :: integer(), Discount :: integer(), Products :: [integer()], Prices :: [integer()]) -> any().\ncashier_init_(N, Discount, Products, Prices) ->\n .\n\n-spec cashier_get_bill(Product :: [integer()], Amount :: [integer()]) -> float().\ncashier_get_bill(Product, Amount) ->\n .\n\n\n%% Your functions will be called as such:\n%% cashier_init_(N, Discount, Products, Prices),\n%% Param_1 = cashier_get_bill(Product, Amount),\n\n%% cashier_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule Cashier do\n @spec init_(n :: integer, discount :: integer, products :: [integer], prices :: [integer]) :: any\n def init_(n, discount, products, prices) do\n\n end\n\n @spec get_bill(product :: [integer], amount :: [integer]) :: float\n def get_bill(product, amount) do\n\n end\nend\n\n# Your functions will be called as such:\n# Cashier.init_(n, discount, products, prices)\n# param_1 = Cashier.get_bill(product, amount)\n\n# Cashier.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"5.1K\", \"totalSubmission\": \"9.6K\", \"totalAcceptedRaw\": 5129, \"totalSubmissionRaw\": 9585, \"acRate\": \"53.5%\"}", "hints": [ "Keep track of the count of the customers.", "Check if the count of the customers is divisible by n then apply the discount formula." ], "solution": null, "status": null, "sampleTestCase": "[\"Cashier\",\"getBill\",\"getBill\",\"getBill\",\"getBill\",\"getBill\",\"getBill\",\"getBill\"]\n[[3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]],[[1,2],[1,2]],[[3,7],[10,10]],[[1,2,3,4,5,6,7],[1,1,1,1,1,1,1]],[[4],[10]],[[7,3],[10,10]],[[7,5,3,1,6,4,2],[10,10,10,9,9,9,7]],[[2,3,5],[5,3,2]]]", "metaData": "{\n \"classname\": \"Cashier\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"n\"\n },\n {\n \"name\": \"discount\",\n \"type\": \"integer\"\n },\n {\n \"name\": \"products\",\n \"type\": \"integer[]\"\n },\n {\n \"name\": \"prices\",\n \"type\": \"integer[]\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer[]\",\n \"name\": \"product\"\n },\n {\n \"type\": \"integer[]\",\n \"name\": \"amount\"\n }\n ],\n \"name\": \"getBill\",\n \"return\": {\n \"type\": \"double\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true,\n \"manual\": false\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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