{ "data": { "question": { "questionId": "1477", "questionFrontendId": "1352", "categoryTitle": "Algorithms", "boundTopicId": 93324, "title": "Product of the Last K Numbers", "titleSlug": "product-of-the-last-k-numbers", "content": "

Design an algorithm that accepts a stream of integers and retrieves the product of the last k integers of the stream.

\n\n

Implement the ProductOfNumbers class:

\n\n\n\n

The test cases are generated so that, at any time, the product of any contiguous sequence of numbers will fit into a single 32-bit integer without overflowing.

\n\n

 

\n

Example:

\n\n
\nInput\n["ProductOfNumbers","add","add","add","add","add","getProduct","getProduct","getProduct","add","getProduct"]\n[[],[3],[0],[2],[5],[4],[2],[3],[4],[8],[2]]\n\nOutput\n[null,null,null,null,null,null,20,40,0,null,32]\n\nExplanation\nProductOfNumbers productOfNumbers = new ProductOfNumbers();\nproductOfNumbers.add(3);        // [3]\nproductOfNumbers.add(0);        // [3,0]\nproductOfNumbers.add(2);        // [3,0,2]\nproductOfNumbers.add(5);        // [3,0,2,5]\nproductOfNumbers.add(4);        // [3,0,2,5,4]\nproductOfNumbers.getProduct(2); // return 20. The product of the last 2 numbers is 5 * 4 = 20\nproductOfNumbers.getProduct(3); // return 40. The product of the last 3 numbers is 2 * 5 * 4 = 40\nproductOfNumbers.getProduct(4); // return 0. The product of the last 4 numbers is 0 * 2 * 5 * 4 = 0\nproductOfNumbers.add(8);        // [3,0,2,5,4,8]\nproductOfNumbers.getProduct(2); // return 32. The product of the last 2 numbers is 4 * 8 = 32 \n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "最后 K 个数的乘积", "translatedContent": "

请你实现一个「数字乘积类」ProductOfNumbers，要求支持下述两种方法：

\n\n

1. add(int num)

\n\n\n\n

2. getProduct(int k)

\n\n\n\n

题目数据保证：任何时候，任一连续数字序列的乘积都在 32-bit 整数范围内，不会溢出。

\n\n

 

\n\n

示例：

\n\n
输入：\n["ProductOfNumbers","add","add","add","add","add","getProduct","getProduct","getProduct","add","getProduct"]\n[[],[3],[0],[2],[5],[4],[2],[3],[4],[8],[2]]\n\n输出：\n[null,null,null,null,null,null,20,40,0,null,32]\n\n解释：\nProductOfNumbers productOfNumbers = new ProductOfNumbers();\nproductOfNumbers.add(3);        // [3]\nproductOfNumbers.add(0);        // [3,0]\nproductOfNumbers.add(2);        // [3,0,2]\nproductOfNumbers.add(5);        // [3,0,2,5]\nproductOfNumbers.add(4);        // [3,0,2,5,4]\nproductOfNumbers.getProduct(2); // 返回 20 。最后 2 个数字的乘积是 5 * 4 = 20\nproductOfNumbers.getProduct(3); // 返回 40 。最后 3 个数字的乘积是 2 * 5 * 4 = 40\nproductOfNumbers.getProduct(4); // 返回  0 。最后 4 个数字的乘积是 0 * 2 * 5 * 4 = 0\nproductOfNumbers.add(8);        // [3,0,2,5,4,8]\nproductOfNumbers.getProduct(2); // 返回 32 。最后 2 个数字的乘积是 4 * 8 = 32 \n
\n\n

 

\n\n

提示：

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obj.add(num);\n * int param_2 = obj.getProduct(k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class ProductOfNumbers(object):\n\n def __init__(self):\n\n\n def add(self, num):\n \"\"\"\n :type num: int\n :rtype: None\n \"\"\"\n\n\n def getProduct(self, k):\n \"\"\"\n :type k: int\n :rtype: int\n \"\"\"\n\n\n\n# Your ProductOfNumbers object will be instantiated and called as such:\n# obj = ProductOfNumbers()\n# obj.add(num)\n# param_2 = obj.getProduct(k)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class ProductOfNumbers:\n\n def __init__(self):\n\n\n def add(self, num: int) -> None:\n\n\n def getProduct(self, k: int) -> int:\n\n\n\n# Your ProductOfNumbers object will be instantiated and called as such:\n# obj = ProductOfNumbers()\n# obj.add(num)\n# param_2 = obj.getProduct(k)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} ProductOfNumbers;\n\n\nProductOfNumbers* productOfNumbersCreate() {\n \n}\n\nvoid productOfNumbersAdd(ProductOfNumbers* obj, int num) {\n \n}\n\nint productOfNumbersGetProduct(ProductOfNumbers* obj, int k) {\n \n}\n\nvoid productOfNumbersFree(ProductOfNumbers* obj) {\n \n}\n\n/**\n * Your ProductOfNumbers struct will be instantiated and called as such:\n * ProductOfNumbers* obj = productOfNumbersCreate();\n * productOfNumbersAdd(obj, num);\n \n * int param_2 = productOfNumbersGetProduct(obj, k);\n \n * productOfNumbersFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class ProductOfNumbers {\n\n public ProductOfNumbers() {\n\n }\n \n public void Add(int num) {\n\n }\n \n public int GetProduct(int k) {\n\n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * ProductOfNumbers obj = new ProductOfNumbers();\n * obj.Add(num);\n * int param_2 = obj.GetProduct(k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "\nvar ProductOfNumbers = function() {\n\n};\n\n/** \n * @param {number} num\n * @return {void}\n */\nProductOfNumbers.prototype.add = function(num) {\n\n};\n\n/** \n * @param {number} k\n * @return {number}\n */\nProductOfNumbers.prototype.getProduct = function(k) {\n\n};\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * var obj = new ProductOfNumbers()\n * obj.add(num)\n * var param_2 = obj.getProduct(k)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class ProductOfNumbers {\n constructor() {\n \n }\n\n add(num: number): void {\n \n }\n\n getProduct(k: number): number {\n \n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * var obj = new ProductOfNumbers()\n * obj.add(num)\n * var param_2 = obj.getProduct(k)\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class ProductOfNumbers {\n /**\n */\n function __construct() {\n\n }\n\n /**\n * @param Integer $num\n * @return NULL\n */\n function add($num) {\n\n }\n\n /**\n * @param Integer $k\n * @return Integer\n */\n function getProduct($k) {\n\n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * $obj = ProductOfNumbers();\n * $obj->add($num);\n * $ret_2 = $obj->getProduct($k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass ProductOfNumbers {\n\n init() {\n\n }\n \n func add(_ num: Int) {\n\n }\n \n func getProduct(_ k: Int) -> Int {\n\n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * let obj = ProductOfNumbers()\n * obj.add(num)\n * let ret_2: Int = obj.getProduct(k)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class ProductOfNumbers() {\n\n fun add(num: Int) {\n\n }\n\n fun getProduct(k: Int): Int {\n\n }\n\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * var obj = ProductOfNumbers()\n * obj.add(num)\n * var param_2 = obj.getProduct(k)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class ProductOfNumbers {\n\n ProductOfNumbers() {\n \n }\n \n void add(int num) {\n \n }\n \n int getProduct(int k) {\n \n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * ProductOfNumbers obj = ProductOfNumbers();\n * obj.add(num);\n * int param2 = obj.getProduct(k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type ProductOfNumbers struct {\n\n}\n\n\nfunc Constructor() ProductOfNumbers {\n\n}\n\n\nfunc (this *ProductOfNumbers) Add(num int) {\n\n}\n\n\nfunc (this *ProductOfNumbers) GetProduct(k int) int {\n\n}\n\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Add(num);\n * param_2 := obj.GetProduct(k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class ProductOfNumbers\n def initialize()\n\n end\n\n\n=begin\n :type num: Integer\n :rtype: Void\n=end\n def add(num)\n\n end\n\n\n=begin\n :type k: Integer\n :rtype: Integer\n=end\n def get_product(k)\n\n end\n\n\nend\n\n# Your ProductOfNumbers object will be instantiated and called as such:\n# obj = ProductOfNumbers.new()\n# obj.add(num)\n# param_2 = obj.get_product(k)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class ProductOfNumbers() {\n\n def add(num: Int) {\n\n }\n\n def getProduct(k: Int): Int = {\n\n }\n\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * var obj = new ProductOfNumbers()\n * obj.add(num)\n * var param_2 = obj.getProduct(k)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct ProductOfNumbers {\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 ProductOfNumbers {\n\n fn new() -> Self {\n\n }\n \n fn add(&self, num: i32) {\n\n }\n \n fn get_product(&self, k: i32) -> i32 {\n\n }\n}\n\n/**\n * Your ProductOfNumbers object will be instantiated and called as such:\n * let obj = ProductOfNumbers::new();\n * obj.add(num);\n * let ret_2: i32 = obj.get_product(k);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define product-of-numbers%\n (class object%\n (super-new)\n \n (init-field)\n \n ; add : exact-integer? -> void?\n (define/public (add num)\n )\n ; get-product : exact-integer? -> exact-integer?\n (define/public (get-product k)\n )))\n\n;; Your product-of-numbers% object will be instantiated and called as such:\n;; (define obj (new product-of-numbers%))\n;; (send obj add num)\n;; (define param_2 (send obj get-product k))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec product_of_numbers_init_() -> any().\nproduct_of_numbers_init_() ->\n .\n\n-spec product_of_numbers_add(Num :: integer()) -> any().\nproduct_of_numbers_add(Num) ->\n .\n\n-spec product_of_numbers_get_product(K :: integer()) -> integer().\nproduct_of_numbers_get_product(K) ->\n .\n\n\n%% Your functions will be called as such:\n%% product_of_numbers_init_(),\n%% product_of_numbers_add(Num),\n%% Param_2 = product_of_numbers_get_product(K),\n\n%% product_of_numbers_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule ProductOfNumbers do\n @spec init_() :: any\n def init_() do\n \n end\n\n @spec add(num :: integer) :: any\n def add(num) do\n \n end\n\n @spec get_product(k :: integer) :: integer\n def get_product(k) do\n \n end\nend\n\n# Your functions will be called as such:\n# ProductOfNumbers.init_()\n# ProductOfNumbers.add(num)\n# param_2 = ProductOfNumbers.get_product(k)\n\n# ProductOfNumbers.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"13.4K\", \"totalSubmission\": \"27.6K\", \"totalAcceptedRaw\": 13422, \"totalSubmissionRaw\": 27555, \"acRate\": \"48.7%\"}", "hints": [ "Keep all prefix products of numbers in an array, then calculate the product of last K elements in O(1) complexity.", "When a zero number is added, clean the array of prefix products." ], "solution": null, "status": null, "sampleTestCase": "[\"ProductOfNumbers\",\"add\",\"add\",\"add\",\"add\",\"add\",\"getProduct\",\"getProduct\",\"getProduct\",\"add\",\"getProduct\"]\n[[],[3],[0],[2],[5],[4],[2],[3],[4],[8],[2]]", "metaData": "{\n \"classname\": \"ProductOfNumbers\",\n \"constructor\": {\n \"params\": []\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": 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