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"question": {
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"title": "Apply Discount Every n Orders",
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"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> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\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<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. 6<sup>th</sup> customer, no discount.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= discount <= 100</code></li>\n\t<li><code>1 <= products.length <= 200</code></li>\n\t<li><code>prices.length == products.length</code></li>\n\t<li><code>1 <= products[i] <= 200</code></li>\n\t<li><code>1 <= prices[i] <= 1000</code></li>\n\t<li>The elements in <code>products</code> are <strong>unique</strong>.</li>\n\t<li><code>1 <= product.length <= 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 <= amount[j] <= 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",
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"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 */",
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"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 */",
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"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)",
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"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)",
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"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*/",
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"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 */",
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"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 */",
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"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)",
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"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 */",
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"lang": "Go",
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"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 */",
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"lang": "Scala",
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"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 */",
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"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 */",
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"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 */",
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"lang": "PHP",
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"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 */",
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"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 */",
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"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))",
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"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",
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"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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For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu99 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</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. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</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 <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https://github.com/datastructures-js/queue\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"ruby\": [\"Ruby\", \"<p><code>Ruby 3.1</code></p>\\r\\n\\r\\n<p>Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms</p>\"], \"swift\": [\"Swift\", \"<p><code>Swift 5.5.2</code>.</p>\"], \"golang\": [\"Go\", \"<p><code>Go 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</a> library.</p>\"], \"python3\": [\"Python3\", \"<p><code>Python 3.10</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/3/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/3/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/3/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>\"], \"scala\": [\"Scala\", \"<p><code>Scala 2.13.7</code>.</p>\"], \"kotlin\": [\"Kotlin\", \"<p><code>Kotlin 1.3.10</code>.</p>\"], \"rust\": [\"Rust\", \"<p><code>Rust 1.58.1</code></p>\\r\\n\\r\\n<p>Supports <a href=\\\"https://crates.io/crates/rand\\\" target=\\\"_blank\\\">rand </a> v0.6\\u00a0from crates.io</p>\"], \"php\": [\"PHP\", \"<p><code>PHP 8.1</code>.</p>\\r\\n<p>With bcmath module</p>\"], \"typescript\": [\"Typescript\", \"<p><code>TypeScript 4.5.4, Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES2020 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\"], \"racket\": [\"Racket\", \"<p>Run with <code>Racket 8.3</code>.</p>\"], \"erlang\": [\"Erlang\", \"Erlang/OTP 24.2\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.0 with Erlang/OTP 24.2\"]}",
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