mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
23 KiB
JSON
186 lines
23 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1477",
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"questionFrontendId": "1352",
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"boundTopicId": null,
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"title": "Product of the Last K Numbers",
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"titleSlug": "product-of-the-last-k-numbers",
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"content": "<p>Design an algorithm that accepts a stream of integers and retrieves the product of the last <code>k</code> integers of the stream.</p>\n\n<p>Implement the <code>ProductOfNumbers</code> class:</p>\n\n<ul>\n\t<li><code>ProductOfNumbers()</code> Initializes the object with an empty stream.</li>\n\t<li><code>void add(int num)</code> Appends the integer <code>num</code> to the stream.</li>\n\t<li><code>int getProduct(int k)</code> Returns the product of the last <code>k</code> numbers in the current list. You can assume that always the current list has at least <code>k</code> numbers.</li>\n</ul>\n\n<p>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.</p>\n\n<p> </p>\n<p><strong>Example:</strong></p>\n\n<pre>\n<strong>Input</strong>\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<strong>Output</strong>\n[null,null,null,null,null,null,20,40,0,null,32]\n\n<strong>Explanation</strong>\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</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= num <= 100</code></li>\n\t<li><code>1 <= k <= 4 * 10<sup>4</sup></code></li>\n\t<li>At most <code>4 * 10<sup>4</sup></code> calls will be made to <code>add</code> and <code>getProduct</code>.</li>\n\t<li>The product of the stream at any point in time will fit in a <strong>32-bit</strong> integer.</li>\n</ul>\n",
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 861,
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"dislikes": 49,
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"similarQuestions": "[]",
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"exampleTestcases": "[\"ProductOfNumbers\",\"add\",\"add\",\"add\",\"add\",\"add\",\"getProduct\",\"getProduct\",\"getProduct\",\"add\",\"getProduct\"]\n[[],[3],[0],[2],[5],[4],[2],[3],[4],[8],[2]]",
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"categoryTitle": "Algorithms",
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"contributors": [],
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"topicTags": [
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"name": "Array",
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"name": "Math",
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"name": "Data Stream",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class ProductOfNumbers {\npublic:\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 = new ProductOfNumbers();\n * obj->add(num);\n * int param_2 = obj->getProduct(k);\n */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "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 */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "Python",
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"langSlug": "python",
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"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)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python3",
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"langSlug": "python3",
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"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)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C",
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"langSlug": "c",
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"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*/",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "C#",
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"langSlug": "csharp",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "JavaScript",
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"langSlug": "javascript",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Ruby",
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"langSlug": "ruby",
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"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)",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Swift",
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"langSlug": "swift",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Go",
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"langSlug": "golang",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Scala",
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"langSlug": "scala",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "PHP",
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"langSlug": "php",
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"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 */",
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"__typename": "CodeSnippetNode"
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{
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"lang": "TypeScript",
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"langSlug": "typescript",
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"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 */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define product-of-numbers%\n (class object%\n (super-new)\n (init-field)\n \n ; add : exact-integer? -> void?\n (define/public (add num)\n\n )\n ; get-product : exact-integer? -> exact-integer?\n (define/public (get-product k)\n\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))",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Erlang",
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"langSlug": "erlang",
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"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.",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Elixir",
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"langSlug": "elixir",
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"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.",
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"__typename": "CodeSnippetNode"
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"hints": [
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"Keep all prefix products of numbers in an array, then calculate the product of last K elements in O(1) complexity.",
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"When a zero number is added, clean the array of prefix products."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"ProductOfNumbers\",\"add\",\"add\",\"add\",\"add\",\"add\",\"getProduct\",\"getProduct\",\"getProduct\",\"add\",\"getProduct\"]\n[[],[3],[0],[2],[5],[4],[2],[3],[4],[8],[2]]",
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"metaData": "{\n \"classname\": \"ProductOfNumbers\",\n \"constructor\": {\n \"params\": []\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"num\"\n }\n ],\n \"name\": \"add\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"k\"\n }\n ],\n \"name\": \"getProduct\",\n \"return\": {\n \"type\": \"integer\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
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"enableRunCode": true,
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"enableTestMode": false,
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"enableDebugger": true,
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two 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>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. Java 8 features such as lambda expressions and stream API can be used. </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 2.7.12</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\\\">will not be maintained past 2020</a>. 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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