Apply Discount Every n Orders
<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>

<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>

<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>

<p>Implement the <code>Cashier</code> class:</p>

<ul>
	<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>
	<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>
</ul>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input</strong>
[&quot;Cashier&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;,&quot;getBill&quot;]
[[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]]]
<strong>Output</strong>
[null,500.0,4000.0,800.0,4000.0,4000.0,7350.0,2500.0]
<strong>Explanation</strong>
Cashier cashier = new Cashier(3,50,[1,2,3,4,5,6,7],[100,200,300,400,300,200,100]);
cashier.getBill([1,2],[1,2]);                        // return 500.0. 1<sup>st</sup> customer, no discount.
                                                     // bill = 1 * 100 + 2 * 200 = 500.
cashier.getBill([3,7],[10,10]);                      // return 4000.0. 2<sup>nd</sup> customer, no discount.
                                                     // bill = 10 * 300 + 10 * 100 = 4000.
cashier.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.
                                                     // Original bill = 1600
                                                     // Actual bill = 1600 * ((100 - 50) / 100) = 800.
cashier.getBill([4],[10]);                           // return 4000.0. 4<sup>th</sup> customer, no discount.
cashier.getBill([7,3],[10,10]);                      // return 4000.0. 5<sup>th</sup> customer, no discount.
cashier.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.
                                                     // Original bill = 14700, but with
                                                     // Actual bill = 14700 * ((100 - 50) / 100) = 7350.
cashier.getBill([2,3,5],[5,3,2]);                    // return 2500.0.  7<sup>th</sup> customer, no discount.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= n &lt;= 10<sup>4</sup></code></li>
	<li><code>0 &lt;= discount &lt;= 100</code></li>
	<li><code>1 &lt;= products.length &lt;= 200</code></li>
	<li><code>prices.length == products.length</code></li>
	<li><code>1 &lt;= products[i] &lt;= 200</code></li>
	<li><code>1 &lt;= prices[i] &lt;= 1000</code></li>
	<li>The elements in <code>products</code> are <strong>unique</strong>.</li>
	<li><code>1 &lt;= product.length &lt;= products.length</code></li>
	<li><code>amount.length == product.length</code></li>
	<li><code>product[j]</code> exists in <code>products</code>.</li>
	<li><code>1 &lt;= amount[j] &lt;= 1000</code></li>
	<li>The elements of <code>product</code> are <strong>unique</strong>.</li>
	<li>At most <code>1000</code> calls will be made to <code>getBill</code>.</li>
	<li>Answers within <code>10<sup>-5</sup></code> of the actual value will be accepted.</li>
</ul>

['apply-discount-to-prices']
[]
[{"value": "cpp", "text": "C++", "defaultCode": "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 */"}, {"value": "java", "text": "Java", "defaultCode": "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 */"}, {"value": "python", "text": "Python", "defaultCode": "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)"}, {"value": "python3", "text": "Python3", "defaultCode": "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)"}, {"value": "c", "text": "C", "defaultCode": "\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*/"}, {"value": "csharp", "text": "C#", "defaultCode": "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 */"}, {"value": "javascript", "text": "JavaScript", "defaultCode": "/**\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 */"}, {"value": "typescript", "text": "TypeScript", "defaultCode": "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 */"}, {"value": "php", "text": "PHP", "defaultCode": "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 */"}, {"value": "swift", "text": "Swift", "defaultCode": "\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 */"}, {"value": "kotlin", "text": "Kotlin", "defaultCode": "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 */"}, {"value": "dart", "text": "Dart", "defaultCode": "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 */"}, {"value": "golang", "text": "Go", "defaultCode": "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 */"}, {"value": "ruby", "text": "Ruby", "defaultCode": "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)"}, {"value": "scala", "text": "Scala", "defaultCode": "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 * val obj = new Cashier(n, discount, products, prices)\n * val param_1 = obj.getBill(product,amount)\n */"}, {"value": "rust", "text": "Rust", "defaultCode": "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 */"}, {"value": "racket", "text": "Racket", "defaultCode": "(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))"}, {"value": "erlang", "text": "Erlang", "defaultCode": "-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."}, {"value": "elixir", "text": "Elixir", "defaultCode": "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."}]
{
  "classname": "Cashier",
  "constructor": {
    "params": [
      {
        "type": "integer",
        "name": "n"
      },
      {
        "name": "discount",
        "type": "integer"
      },
      {
        "name": "products",
        "type": "integer[]"
      },
      {
        "name": "prices",
        "type": "integer[]"
      }
    ]
  },
  "methods": [
    {
      "params": [
        {
          "type": "integer[]",
          "name": "product"
        },
        {
          "type": "integer[]",
          "name": "amount"
        }
      ],
      "name": "getBill",
      "return": {
        "type": "double"
      }
    }
  ],
  "return": {
    "type": "boolean"
  },
  "systemdesign": true,
  "manual": false
}
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Using compile arguments: <code>--enable-preview --release 21</code></p>\r\n\r\n<p>Most standard library headers are already included automatically for your convenience.</p>\r\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>"], "python": ["Python", "<p><code>Python 2.7.18</code>.</p>\r\n\r\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\"https://docs.python.org/2/library/array.html\" target=\"_blank\">array</a>, <a href=\"https://docs.python.org/2/library/bisect.html\" target=\"_blank\">bisect</a>, <a href=\"https://docs.python.org/2/library/collections.html\" target=\"_blank\">collections</a>. If you need more libraries, you can import it yourself.</p>\r\n\r\n<p>For Map/TreeMap data structure, you may use <a href=\"http://www.grantjenks.com/docs/sortedcontainers/\" target=\"_blank\">sortedcontainers</a> library.</p>\r\n\r\n<p>Note that Python 2.7 <a href=\"https://www.python.org/dev/peps/pep-0373/\" target=\"_blank\">is not maintained anymore</a>. For the latest Python, please choose Python3 instead.</p>"], "c": ["C", "<p>Compiled with <code>gcc 14</code> using the gnu11 standard.</p>\r\n\r\n<p>Your code is compiled with level one optimization (<code>-O2</code>). <a href=\"https://github.com/google/sanitizers/wiki/AddressSanitizer\" target=\"_blank\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\r\n\r\n<p>Most standard library headers are already included automatically for your convenience.</p>\r\n\r\n<p>For hash table operations, you may use <a href=\"https://troydhanson.github.io/uthash/\" target=\"_blank\">uthash</a>. \"uthash.h\" is included by default. Below are some examples:</p>\r\n\r\n<p><b>1. Adding an item to a hash.</b>\r\n<pre>\r\nstruct hash_entry {\r\n    int id;            /* we'll use this field as the key */\r\n    char name[10];\r\n    UT_hash_handle hh; /* makes this structure hashable */\r\n};\r\n\r\nstruct hash_entry *users = NULL;\r\n\r\nvoid add_user(struct hash_entry *s) {\r\n    HASH_ADD_INT(users, id, s);\r\n}\r\n</pre>\r\n</p>\r\n\r\n<p><b>2. Looking up an item in a hash:</b>\r\n<pre>\r\nstruct hash_entry *find_user(int user_id) {\r\n    struct hash_entry *s;\r\n    HASH_FIND_INT(users, &user_id, s);\r\n    return s;\r\n}\r\n</pre>\r\n</p>\r\n\r\n<p><b>3. 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If you need more libraries, you can import it yourself.</p>\r\n\r\n<p>For Map/TreeMap data structure, you may use <a href=\"http://www.grantjenks.com/docs/sortedcontainers/\" target=\"_blank\">sortedcontainers</a> library.</p>"], "scala": ["Scala", "<p><code>Scala 3.3.1</code>.</p>"], "kotlin": ["Kotlin", "<p><code>Kotlin 2.1.10</code>.</p>"], "rust": ["Rust", "<p><code>Rust 1.85.0</code>. Your code will be compiled with <code>opt-level</code> 2.</p>\r\n\r\n<p>Supports <a href=\"https://crates.io/crates/rand\" target=\"_blank\">rand v0.8</a> and <a href=\"https://crates.io/crates/regex\" target=\"_blank\">regex\u00a0v1</a> and <a href=\"https://crates.io/crates/itertools\" target=\"_blank\">itertools\u00a0v0.14</a> from crates.io</p>"], "php": ["PHP", "<p><code>PHP 8.2</code>.</p>\r\n<p>With bcmath module</p>"], "typescript": ["Typescript", "<p><code>TypeScript 5.7.3, Node.js 22.14.0</code>.</p>\r\n\r\n<p>Compile Options: <code>--alwaysStrict --strictBindCallApply --strictFunctionTypes --target ES2024</code></p>\r\n\r\n<p><a href=\"https://lodash.com\" target=\"_blank\">lodash.js</a> library is included by default.</p>\r\n\r\n<p>For Priority Queue / Queue data structures, you may use 6.3.2 version of <a href=\"https://github.com/datastructures-js/priority-queue/tree/v6.3.2\" target=\"_blank\">datastructures-js/priority-queue</a> and 4.2.3 version of <a href=\"https://github.com/datastructures-js/queue/tree/v4.2.3\" target=\"_blank\">datastructures-js/queue</a> and 1.0.4 version of <a href=\"https://github.com/datastructures-js/deque/tree/v1.0.4\" target=\"_blank\">datastructures-js/deque</a>.</p>"], "racket": ["Racket", "<p><a href=\"https://docs.racket-lang.org/guide/performance.html#%28tech._c%29\" target=\"_blank\">Racket CS</a> v8.15</p>\r\n\r\n<p>Using <code>#lang racket</code></p>\r\n\r\n<p>Required <code>data/gvector data/queue data/order data/heap</code> automatically for your convenience</p>"], "erlang": ["Erlang", "Erlang/OTP 26"], "elixir": ["Elixir", "Elixir 1.17 with Erlang/OTP 26"], "dart": ["Dart", "<p>Dart 3.2. You may use package <a href=\"https://pub.dev/packages/collection/versions/1.18.0\" target=\"_blank\">collection</a></p>\r\n\r\n<p>Your code will be run directly without compiling</p>"]}
['Array', 'Hash Table', 'Design']