leetcode-problemset/leetcode-cn/originData/apply-discount-every-n-orders.json

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    "data": {
        "question": {
            "questionId": "1459",
            "questionFrontendId": "1357",
            "categoryTitle": "Algorithms",
            "boundTopicId": 102331,
            "title": "Apply Discount Every n Orders",
            "titleSlug": "apply-discount-every-n-orders",
            "content": "<p>There is a supermarket that is frequented by many customers. The products sold at the supermarket are represented as two parallel integer arrays <code>products</code> and <code>prices</code>, where the <code>i<sup>th</sup></code> product has an ID of <code>products[i]</code> and a price of <code>prices[i]</code>.</p>\n\n<p>When a customer is paying, their bill is represented as two parallel integer arrays <code>product</code> and <code>amount</code>, where the <code>j<sup>th</sup></code> product they purchased has an ID of <code>product[j]</code>, and <code>amount[j]</code> is how much of the product they bought. Their subtotal is calculated as the sum of each <code>amount[j] * (price of the j<sup>th</sup> product)</code>.</p>\n\n<p>The supermarket decided to have a sale. Every <code>n<sup>th</sup></code> customer paying for their groceries will be given a <strong>percentage discount</strong>. The discount amount is given by <code>discount</code>, where they will be given <code>discount</code> percent off their subtotal. More formally, if their subtotal is <code>bill</code>, then they would actually pay <code>bill * ((100 - discount) / 100)</code>.</p>\n\n<p>Implement the <code>Cashier</code> class:</p>\n\n<ul>\n\t<li><code>Cashier(int n, int discount, int[] products, int[] prices)</code> Initializes the object with <code>n</code>, the <code>discount</code>, and the <code>products</code> and their <code>prices</code>.</li>\n\t<li><code>double getBill(int[] product, int[] amount)</code> Returns the final total of the bill with the discount applied (if any). Answers within <code>10<sup>-5</sup></code> of the actual value will be accepted.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;Cashier&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;]\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<strong>Output</strong>\n[null,500.0,4000.0,800.0,4000.0,4000.0,7350.0,2500.0]\n<strong>Explanation</strong>\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. 1<sup>st</sup> customer, no discount.\n                                                     // bill = 1 * 100 + 2 * 200 = 500.\ncashier.getBill([3,7],[10,10]);                      // return 4000.0. 2<sup>nd</sup> 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. 3<sup>rd</sup> customer, 50% discount.\n                                                     // Original bill = 1600\n                                                     // Actual bill = 1600 * ((100 - 50) / 100) = 800.\ncashier.getBill([4],[10]);                           // return 4000.0. 4<sup>th</sup> customer, no discount.\ncashier.getBill([7,3],[10,10]);                      // return 4000.0. 5<sup>th</sup> customer, no discount.\ncashier.getBill([7,5,3,1,6,4,2],[10,10,10,9,9,9,7]); // return 7350.0. 6<sup>th</sup> 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.  7<sup>th</sup> customer, no discount.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>4</sup></code></li>\n\t<li><code>0 &lt;= discount &lt;= 100</code></li>\n\t<li><code>1 &lt;= products.length &lt;= 200</code></li>\n\t<li><code>prices.length == products.length</code></li>\n\t<li><code>1 &lt;= products[i] &lt;= 200</code></li>\n\t<li><code>1 &lt;= prices[i] &lt;= 1000</code></li>\n\t<li>The elements in <code>products</code> are <strong>unique</strong>.</li>\n\t<li><code>1 &lt;= product.length &lt;= products.length</code></li>\n\t<li><code>amount.length == product.length</code></li>\n\t<li><code>product[j]</code> exists in <code>products</code>.</li>\n\t<li><code>1 &lt;= amount[j] &lt;= 1000</code></li>\n\t<li>The elements of <code>product</code> are <strong>unique</strong>.</li>\n\t<li>At most <code>1000</code> calls will be made to <code>getBill</code>.</li>\n\t<li>Answers within <code>10<sup>-5</sup></code> of the actual value will be accepted.</li>\n</ul>\n",
            "translatedTitle": "每隔 n 个顾客打折",
            "translatedContent": "<p>超市里正在举行打折活动，每隔&nbsp;<code>n</code>&nbsp;个顾客会得到 <code>discount</code>&nbsp;的折扣。</p>\n\n<p>超市里有一些商品，第&nbsp;<code>i</code>&nbsp;种商品为&nbsp;<code>products[i]</code>&nbsp;且每件单品的价格为&nbsp;<code>prices[i]</code>&nbsp;。</p>\n\n<p>结账系统会统计顾客的数目，每隔&nbsp;<code>n</code>&nbsp;个顾客结账时，该顾客的账单都会打折，折扣为&nbsp;<code>discount</code>&nbsp;（也就是如果原本账单为&nbsp;<code>x</code>&nbsp;，那么实际金额会变成&nbsp;<code>x - (discount * x) / 100</code>&nbsp;），然后系统会重新开始计数。</p>\n\n<p>顾客会购买一些商品，&nbsp;<code>product[i]</code>&nbsp;是顾客购买的第&nbsp;<code>i</code>&nbsp;种商品，&nbsp;<code>amount[i]</code>&nbsp;是对应的购买该种商品的数目。</p>\n\n<p>请你实现&nbsp;<code>Cashier</code>&nbsp;类：</p>\n\n<ul>\n\t<li><code>Cashier(int n, int discount, int[] products, int[] prices)</code>&nbsp;初始化实例对象，参数分别为打折频率&nbsp;<code>n</code>&nbsp;，折扣大小 <code>discount</code>&nbsp;，超市里的商品列表 <code>products</code>&nbsp;和它们的价格 <code>prices</code>&nbsp;。</li>\n\t<li><code>double&nbsp;getBill(int[] product, int[] amount)</code>&nbsp;返回账单的实际金额（如果有打折，请返回打折后的结果）。返回结果与标准答案误差在&nbsp;<code>10^-5</code>&nbsp;以内都视为正确结果。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入</strong>\n[&quot;Cashier&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;]\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<strong>输出</strong>\n[null,500.0,4000.0,800.0,4000.0,4000.0,7350.0,2500.0]\n<strong>解释</strong>\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</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10^4</code></li>\n\t<li><code>0 &lt;= discount &lt;= 100</code></li>\n\t<li><code>1 &lt;= products.length &lt;= 200</code></li>\n\t<li><code>1 &lt;= products[i] &lt;= 200</code></li>\n\t<li><code>products</code>&nbsp;列表中&nbsp;<strong>不会</strong>&nbsp;有重复的元素。</li>\n\t<li><code>prices.length == products.length</code></li>\n\t<li><code>1 &lt;= prices[i] &lt;= 1000</code></li>\n\t<li><code>1 &lt;= product.length &lt;= products.length</code></li>\n\t<li><code>product[i]</code>&nbsp;在&nbsp;<code>products</code>&nbsp;出现过。</li>\n\t<li><code>amount.length == product.length</code></li>\n\t<li><code>1 &lt;= amount[i] &lt;= 1000</code></li>\n\t<li>最多有&nbsp;<code>1000</code> 次对&nbsp;<code>getBill</code>&nbsp;函数的调用。</li>\n\t<li>返回结果与标准答案误差在&nbsp;<code>10^-5</code>&nbsp;以内都视为正确结果。</li>\n</ul>\n",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class Cashier {\npublic:\n    Cashier(int n, int discount, vector<int>& products, vector<int>& prices) {\n\n    }\n    \n    double getBill(vector<int> product, vector<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"
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                    "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"
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                {
                    "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"
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                {
                    "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": "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": "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"
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                {
                    "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"
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                {
                    "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"
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                {
                    "lang": "Dart",
                    "langSlug": "dart",
                    "code": "class Cashier {\n\n  Cashier(int n, int discount, List<int> products, List<int> prices) {\n    \n  }\n  \n  double getBill(List<int> product, List<int> amount) {\n    \n  }\n}\n\n/**\n * Your Cashier object will be instantiated and called as such:\n * Cashier obj = Cashier(n, discount, products, prices);\n * double param1 = obj.getBill(product,amount);\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "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"
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                {
                    "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": "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"
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                {
                    "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<i32>, prices: Vec<i32>) -> Self {\n\n    }\n    \n    fn get_bill(&self, product: Vec<i32>, amount: Vec<i32>) -> 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"
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                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define cashier%\n  (class object%\n    (super-new)\n    \n    ; n : exact-integer?\n    ; discount : exact-integer?\n    ; products : (listof exact-integer?)\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;; 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"
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                    "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.",
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                    "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.",
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            "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."
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            "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",
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            "enableRunCode": true,
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