mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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190 lines
38 KiB
JSON
190 lines
38 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "2429",
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"questionFrontendId": "2353",
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"categoryTitle": "Algorithms",
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"boundTopicId": 1689348,
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"title": "Design a Food Rating System",
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"titleSlug": "design-a-food-rating-system",
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"content": "<p>Design a food rating system that can do the following:</p>\n\n<ul>\n\t<li><strong>Modify</strong> the rating of a food item listed in the system.</li>\n\t<li>Return the highest-rated food item for a type of cuisine in the system.</li>\n</ul>\n\n<p>Implement the <code>FoodRatings</code> class:</p>\n\n<ul>\n\t<li><code>FoodRatings(String[] foods, String[] cuisines, int[] ratings)</code> Initializes the system. The food items are described by <code>foods</code>, <code>cuisines</code> and <code>ratings</code>, all of which have a length of <code>n</code>.\n\n\t<ul>\n\t\t<li><code>foods[i]</code> is the name of the <code>i<sup>th</sup></code> food,</li>\n\t\t<li><code>cuisines[i]</code> is the type of cuisine of the <code>i<sup>th</sup></code> food, and</li>\n\t\t<li><code>ratings[i]</code> is the initial rating of the <code>i<sup>th</sup></code> food.</li>\n\t</ul>\n\t</li>\n\t<li><code>void changeRating(String food, int newRating)</code> Changes the rating of the food item with the name <code>food</code>.</li>\n\t<li><code>String highestRated(String cuisine)</code> Returns the name of the food item that has the highest rating for the given type of <code>cuisine</code>. If there is a tie, return the item with the <strong>lexicographically smaller</strong> name.</li>\n</ul>\n\n<p>Note that a string <code>x</code> is lexicographically smaller than string <code>y</code> if <code>x</code> comes before <code>y</code> in dictionary order, that is, either <code>x</code> is a prefix of <code>y</code>, or if <code>i</code> is the first position such that <code>x[i] != y[i]</code>, then <code>x[i]</code> comes before <code>y[i]</code> in alphabetic order.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["FoodRatings", "highestRated", "highestRated", "changeRating", "highestRated", "changeRating", "highestRated"]\n[[["kimchi", "miso", "sushi", "moussaka", "ramen", "bulgogi"], ["korean", "japanese", "japanese", "greek", "japanese", "korean"], [9, 12, 8, 15, 14, 7]], ["korean"], ["japanese"], ["sushi", 16], ["japanese"], ["ramen", 16], ["japanese"]]\n<strong>Output</strong>\n[null, "kimchi", "ramen", null, "sushi", null, "ramen"]\n\n<strong>Explanation</strong>\nFoodRatings foodRatings = new FoodRatings(["kimchi", "miso", "sushi", "moussaka", "ramen", "bulgogi"], ["korean", "japanese", "japanese", "greek", "japanese", "korean"], [9, 12, 8, 15, 14, 7]);\nfoodRatings.highestRated("korean"); // return "kimchi"\n // "kimchi" is the highest rated korean food with a rating of 9.\nfoodRatings.highestRated("japanese"); // return "ramen"\n // "ramen" is the highest rated japanese food with a rating of 14.\nfoodRatings.changeRating("sushi", 16); // "sushi" now has a rating of 16.\nfoodRatings.highestRated("japanese"); // return "sushi"\n // "sushi" is the highest rated japanese food with a rating of 16.\nfoodRatings.changeRating("ramen", 16); // "ramen" now has a rating of 16.\nfoodRatings.highestRated("japanese"); // return "ramen"\n // Both "sushi" and "ramen" have a rating of 16.\n // However, "ramen" is lexicographically smaller than "sushi".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>n == foods.length == cuisines.length == ratings.length</code></li>\n\t<li><code>1 <= foods[i].length, cuisines[i].length <= 10</code></li>\n\t<li><code>foods[i]</code>, <code>cuisines[i]</code> consist of lowercase English letters.</li>\n\t<li><code>1 <= ratings[i] <= 10<sup>8</sup></code></li>\n\t<li>All the strings in <code>foods</code> are <strong>distinct</strong>.</li>\n\t<li><code>food</code> will be the name of a food item in the system across all calls to <code>changeRating</code>.</li>\n\t<li><code>cuisine</code> will be a type of cuisine of <strong>at least one</strong> food item in the system across all calls to <code>highestRated</code>.</li>\n\t<li>At most <code>2 * 10<sup>4</sup></code> calls <strong>in total</strong> will be made to <code>changeRating</code> and <code>highestRated</code>.</li>\n</ul>\n",
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"translatedTitle": "设计食物评分系统",
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"translatedContent": "<p>设计一个支持下述操作的食物评分系统：</p>\n\n<ul>\n\t<li><strong>修改</strong> 系统中列出的某种食物的评分。</li>\n\t<li>返回系统中某一类烹饪方式下评分最高的食物。</li>\n</ul>\n\n<p>实现 <code>FoodRatings</code> 类：</p>\n\n<ul>\n\t<li><code>FoodRatings(String[] foods, String[] cuisines, int[] ratings)</code> 初始化系统。食物由 <code>foods</code>、<code>cuisines</code> 和 <code>ratings</code> 描述，长度均为 <code>n</code> 。\n\n\t<ul>\n\t\t<li><code>foods[i]</code> 是第 <code>i</code> 种食物的名字。</li>\n\t\t<li><code>cuisines[i]</code> 是第 <code>i</code> 种食物的烹饪方式。</li>\n\t\t<li><code>ratings[i]</code> 是第 <code>i</code> 种食物的最初评分。</li>\n\t</ul>\n\t</li>\n\t<li><code>void changeRating(String food, int newRating)</code> 修改名字为 <code>food</code> 的食物的评分。</li>\n\t<li><code>String highestRated(String cuisine)</code> 返回指定烹饪方式 <code>cuisine</code> 下评分最高的食物的名字。如果存在并列，返回 <strong>字典序较小</strong> 的名字。</li>\n</ul>\n\n<p>注意，字符串 <code>x</code> 的字典序比字符串 <code>y</code> 更小的前提是：<code>x</code> 在字典中出现的位置在 <code>y</code> 之前，也就是说，要么 <code>x</code> 是 <code>y</code> 的前缀，或者在满足 <code>x[i] != y[i]</code> 的第一个位置 <code>i</code> 处，<code>x[i]</code> 在字母表中出现的位置在 <code>y[i]</code> 之前。</p>\n\n<p> </p>\n\n<p><strong>示例：</strong></p>\n\n<pre><strong>输入</strong>\n[\"FoodRatings\", \"highestRated\", \"highestRated\", \"changeRating\", \"highestRated\", \"changeRating\", \"highestRated\"]\n[[[\"kimchi\", \"miso\", \"sushi\", \"moussaka\", \"ramen\", \"bulgogi\"], [\"korean\", \"japanese\", \"japanese\", \"greek\", \"japanese\", \"korean\"], [9, 12, 8, 15, 14, 7]], [\"korean\"], [\"japanese\"], [\"sushi\", 16], [\"japanese\"], [\"ramen\", 16], [\"japanese\"]]\n<strong>输出</strong>\n[null, \"kimchi\", \"ramen\", null, \"sushi\", null, \"ramen\"]\n\n<strong>解释</strong>\nFoodRatings foodRatings = new FoodRatings([\"kimchi\", \"miso\", \"sushi\", \"moussaka\", \"ramen\", \"bulgogi\"], [\"korean\", \"japanese\", \"japanese\", \"greek\", \"japanese\", \"korean\"], [9, 12, 8, 15, 14, 7]);\nfoodRatings.highestRated(\"korean\"); // 返回 \"kimchi\"\n // \"kimchi\" 是分数最高的韩式料理，评分为 9 。\nfoodRatings.highestRated(\"japanese\"); // 返回 \"ramen\"\n // \"ramen\" 是分数最高的日式料理，评分为 14 。\nfoodRatings.changeRating(\"sushi\", 16); // \"sushi\" 现在评分变更为 16 。\nfoodRatings.highestRated(\"japanese\"); // 返回 \"sushi\"\n // \"sushi\" 是分数最高的日式料理，评分为 16 。\nfoodRatings.changeRating(\"ramen\", 16); // \"ramen\" 现在评分变更为 16 。\nfoodRatings.highestRated(\"japanese\"); // 返回 \"ramen\"\n // \"sushi\" 和 \"ramen\" 的评分都是 16 。\n // 但是，\"ramen\" 的字典序比 \"sushi\" 更小。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>n == foods.length == cuisines.length == ratings.length</code></li>\n\t<li><code>1 <= foods[i].length, cuisines[i].length <= 10</code></li>\n\t<li><code>foods[i]</code>、<code>cuisines[i]</code> 由小写英文字母组成</li>\n\t<li><code>1 <= ratings[i] <= 10<sup>8</sup></code></li>\n\t<li><code>foods</code> 中的所有字符串 <strong>互不相同</strong></li>\n\t<li>在对 <code>changeRating</code> 的所有调用中，<code>food</code> 是系统中食物的名字。</li>\n\t<li>在对 <code>highestRated</code> 的所有调用中，<code>cuisine</code> 是系统中 <strong>至少一种</strong> 食物的烹饪方式。</li>\n\t<li>最多调用 <code>changeRating</code> 和 <code>highestRated</code> <strong>总计</strong> <code>2 * 10<sup>4</sup></code> 次</li>\n</ul>\n",
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"code": "class FoodRatings {\npublic:\n FoodRatings(vector<string>& foods, vector<string>& cuisines, vector<int>& ratings) {\n\n }\n \n void changeRating(string food, int newRating) {\n\n }\n \n string highestRated(string cuisine) {\n\n }\n};\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * FoodRatings* obj = new FoodRatings(foods, cuisines, ratings);\n * obj->changeRating(food,newRating);\n * string param_2 = obj->highestRated(cuisine);\n */",
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"code": "class FoodRatings {\n\n public FoodRatings(String[] foods, String[] cuisines, int[] ratings) {\n\n }\n \n public void changeRating(String food, int newRating) {\n\n }\n \n public String highestRated(String cuisine) {\n\n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * FoodRatings obj = new FoodRatings(foods, cuisines, ratings);\n * obj.changeRating(food,newRating);\n * String param_2 = obj.highestRated(cuisine);\n */",
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"code": "class FoodRatings(object):\n\n def __init__(self, foods, cuisines, ratings):\n \"\"\"\n :type foods: List[str]\n :type cuisines: List[str]\n :type ratings: List[int]\n \"\"\"\n\n\n def changeRating(self, food, newRating):\n \"\"\"\n :type food: str\n :type newRating: int\n :rtype: None\n \"\"\"\n\n\n def highestRated(self, cuisine):\n \"\"\"\n :type cuisine: str\n :rtype: str\n \"\"\"\n\n\n\n# Your FoodRatings object will be instantiated and called as such:\n# obj = FoodRatings(foods, cuisines, ratings)\n# obj.changeRating(food,newRating)\n# param_2 = obj.highestRated(cuisine)",
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"code": "class FoodRatings:\n\n def __init__(self, foods: List[str], cuisines: List[str], ratings: List[int]):\n\n\n def changeRating(self, food: str, newRating: int) -> None:\n\n\n def highestRated(self, cuisine: str) -> str:\n\n\n\n# Your FoodRatings object will be instantiated and called as such:\n# obj = FoodRatings(foods, cuisines, ratings)\n# obj.changeRating(food,newRating)\n# param_2 = obj.highestRated(cuisine)",
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"code": "\n\n\ntypedef struct {\n \n} FoodRatings;\n\n\nFoodRatings* foodRatingsCreate(char** foods, int foodsSize, char** cuisines, int cuisinesSize, int* ratings, int ratingsSize) {\n \n}\n\nvoid foodRatingsChangeRating(FoodRatings* obj, char* food, int newRating) {\n \n}\n\nchar* foodRatingsHighestRated(FoodRatings* obj, char* cuisine) {\n \n}\n\nvoid foodRatingsFree(FoodRatings* obj) {\n \n}\n\n/**\n * Your FoodRatings struct will be instantiated and called as such:\n * FoodRatings* obj = foodRatingsCreate(foods, foodsSize, cuisines, cuisinesSize, ratings, ratingsSize);\n * foodRatingsChangeRating(obj, food, newRating);\n \n * char* param_2 = foodRatingsHighestRated(obj, cuisine);\n \n * foodRatingsFree(obj);\n*/",
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"code": "public class FoodRatings {\n\n public FoodRatings(string[] foods, string[] cuisines, int[] ratings) {\n\n }\n \n public void ChangeRating(string food, int newRating) {\n\n }\n \n public string HighestRated(string cuisine) {\n\n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * FoodRatings obj = new FoodRatings(foods, cuisines, ratings);\n * obj.ChangeRating(food,newRating);\n * string param_2 = obj.HighestRated(cuisine);\n */",
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"code": "/**\n * @param {string[]} foods\n * @param {string[]} cuisines\n * @param {number[]} ratings\n */\nvar FoodRatings = function(foods, cuisines, ratings) {\n\n};\n\n/** \n * @param {string} food \n * @param {number} newRating\n * @return {void}\n */\nFoodRatings.prototype.changeRating = function(food, newRating) {\n\n};\n\n/** \n * @param {string} cuisine\n * @return {string}\n */\nFoodRatings.prototype.highestRated = function(cuisine) {\n\n};\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * var obj = new FoodRatings(foods, cuisines, ratings)\n * obj.changeRating(food,newRating)\n * var param_2 = obj.highestRated(cuisine)\n */",
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"code": "class FoodRatings {\n constructor(foods: string[], cuisines: string[], ratings: number[]) {\n \n }\n\n changeRating(food: string, newRating: number): void {\n \n }\n\n highestRated(cuisine: string): string {\n \n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * var obj = new FoodRatings(foods, cuisines, ratings)\n * obj.changeRating(food,newRating)\n * var param_2 = obj.highestRated(cuisine)\n */",
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"lang": "PHP",
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"code": "class FoodRatings {\n /**\n * @param String[] $foods\n * @param String[] $cuisines\n * @param Integer[] $ratings\n */\n function __construct($foods, $cuisines, $ratings) {\n\n }\n\n /**\n * @param String $food\n * @param Integer $newRating\n * @return NULL\n */\n function changeRating($food, $newRating) {\n\n }\n\n /**\n * @param String $cuisine\n * @return String\n */\n function highestRated($cuisine) {\n\n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * $obj = FoodRatings($foods, $cuisines, $ratings);\n * $obj->changeRating($food, $newRating);\n * $ret_2 = $obj->highestRated($cuisine);\n */",
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"code": "\nclass FoodRatings {\n\n init(_ foods: [String], _ cuisines: [String], _ ratings: [Int]) {\n\n }\n \n func changeRating(_ food: String, _ newRating: Int) {\n\n }\n \n func highestRated(_ cuisine: String) -> String {\n\n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * let obj = FoodRatings(foods, cuisines, ratings)\n * obj.changeRating(food, newRating)\n * let ret_2: String = obj.highestRated(cuisine)\n */",
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"code": "class FoodRatings(foods: Array<String>, cuisines: Array<String>, ratings: IntArray) {\n\n fun changeRating(food: String, newRating: Int) {\n\n }\n\n fun highestRated(cuisine: String): String {\n\n }\n\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * var obj = FoodRatings(foods, cuisines, ratings)\n * obj.changeRating(food,newRating)\n * var param_2 = obj.highestRated(cuisine)\n */",
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"code": "class FoodRatings {\n\n FoodRatings(List<String> foods, List<String> cuisines, List<int> ratings) {\n \n }\n \n void changeRating(String food, int newRating) {\n \n }\n \n String highestRated(String cuisine) {\n \n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * FoodRatings obj = FoodRatings(foods, cuisines, ratings);\n * obj.changeRating(food,newRating);\n * String param2 = obj.highestRated(cuisine);\n */",
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"lang": "Go",
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"code": "type FoodRatings struct {\n\n}\n\n\nfunc Constructor(foods []string, cuisines []string, ratings []int) FoodRatings {\n\n}\n\n\nfunc (this *FoodRatings) ChangeRating(food string, newRating int) {\n\n}\n\n\nfunc (this *FoodRatings) HighestRated(cuisine string) string {\n\n}\n\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * obj := Constructor(foods, cuisines, ratings);\n * obj.ChangeRating(food,newRating);\n * param_2 := obj.HighestRated(cuisine);\n */",
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"code": "class FoodRatings\n\n=begin\n :type foods: String[]\n :type cuisines: String[]\n :type ratings: Integer[]\n=end\n def initialize(foods, cuisines, ratings)\n\n end\n\n\n=begin\n :type food: String\n :type new_rating: Integer\n :rtype: Void\n=end\n def change_rating(food, new_rating)\n\n end\n\n\n=begin\n :type cuisine: String\n :rtype: String\n=end\n def highest_rated(cuisine)\n\n end\n\n\nend\n\n# Your FoodRatings object will be instantiated and called as such:\n# obj = FoodRatings.new(foods, cuisines, ratings)\n# obj.change_rating(food, new_rating)\n# param_2 = obj.highest_rated(cuisine)",
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"code": "class FoodRatings(_foods: Array[String], _cuisines: Array[String], _ratings: Array[Int]) {\n\n def changeRating(food: String, newRating: Int) {\n\n }\n\n def highestRated(cuisine: String): String = {\n\n }\n\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * var obj = new FoodRatings(foods, cuisines, ratings)\n * obj.changeRating(food,newRating)\n * var param_2 = obj.highestRated(cuisine)\n */",
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"code": "struct FoodRatings {\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 FoodRatings {\n\n fn new(foods: Vec<String>, cuisines: Vec<String>, ratings: Vec<i32>) -> Self {\n\n }\n \n fn change_rating(&self, food: String, new_rating: i32) {\n\n }\n \n fn highest_rated(&self, cuisine: String) -> String {\n\n }\n}\n\n/**\n * Your FoodRatings object will be instantiated and called as such:\n * let obj = FoodRatings::new(foods, cuisines, ratings);\n * obj.change_rating(food, newRating);\n * let ret_2: String = obj.highest_rated(cuisine);\n */",
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"code": "(define food-ratings%\n (class object%\n (super-new)\n \n ; foods : (listof string?)\n ; cuisines : (listof string?)\n ; ratings : (listof exact-integer?)\n (init-field\n foods\n cuisines\n ratings)\n \n ; change-rating : string? exact-integer? -> void?\n (define/public (change-rating food new-rating)\n )\n ; highest-rated : string? -> string?\n (define/public (highest-rated cuisine)\n )))\n\n;; Your food-ratings% object will be instantiated and called as such:\n;; (define obj (new food-ratings% [foods foods] [cuisines cuisines] [ratings ratings]))\n;; (send obj change-rating food new-rating)\n;; (define param_2 (send obj highest-rated cuisine))",
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"lang": "Erlang",
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"code": "-spec food_ratings_init_(Foods :: [unicode:unicode_binary()], Cuisines :: [unicode:unicode_binary()], Ratings :: [integer()]) -> any().\nfood_ratings_init_(Foods, Cuisines, Ratings) ->\n .\n\n-spec food_ratings_change_rating(Food :: unicode:unicode_binary(), NewRating :: integer()) -> any().\nfood_ratings_change_rating(Food, NewRating) ->\n .\n\n-spec food_ratings_highest_rated(Cuisine :: unicode:unicode_binary()) -> unicode:unicode_binary().\nfood_ratings_highest_rated(Cuisine) ->\n .\n\n\n%% Your functions will be called as such:\n%% food_ratings_init_(Foods, Cuisines, Ratings),\n%% food_ratings_change_rating(Food, NewRating),\n%% Param_2 = food_ratings_highest_rated(Cuisine),\n\n%% food_ratings_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 FoodRatings do\n @spec init_(foods :: [String.t], cuisines :: [String.t], ratings :: [integer]) :: any\n def init_(foods, cuisines, ratings) do\n \n end\n\n @spec change_rating(food :: String.t, new_rating :: integer) :: any\n def change_rating(food, new_rating) do\n \n end\n\n @spec highest_rated(cuisine :: String.t) :: String.t\n def highest_rated(cuisine) do\n \n end\nend\n\n# Your functions will be called as such:\n# FoodRatings.init_(foods, cuisines, ratings)\n# FoodRatings.change_rating(food, new_rating)\n# param_2 = FoodRatings.highest_rated(cuisine)\n\n# FoodRatings.init_ will be called before every test case, in which you can do some necessary initializations.",
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"hints": [
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"The key to solving this problem is to properly store the data using the right data structures.",
|
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"Firstly, a hash table is needed to efficiently map each food item to its cuisine and current rating.",
|
|
"In addition, another hash table is needed to map cuisines to foods within each cuisine stored in an ordered set according to their ratings."
|
|
],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"FoodRatings\",\"highestRated\",\"highestRated\",\"changeRating\",\"highestRated\",\"changeRating\",\"highestRated\"]\n[[[\"kimchi\",\"miso\",\"sushi\",\"moussaka\",\"ramen\",\"bulgogi\"],[\"korean\",\"japanese\",\"japanese\",\"greek\",\"japanese\",\"korean\"],[9,12,8,15,14,7]],[\"korean\"],[\"japanese\"],[\"sushi\",16],[\"japanese\"],[\"ramen\",16],[\"japanese\"]]",
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"metaData": "{\n \"classname\": \"FoodRatings\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"string[]\",\n \"name\": \"foods\"\n },\n {\n \"name\": \"cuisines\",\n \"type\": \"string[]\"\n },\n {\n \"name\": \"ratings\",\n \"type\": \"integer[]\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"food\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"newRating\"\n }\n ],\n \"name\": \"changeRating\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"string\",\n \"name\": \"cuisine\"\n }\n ],\n \"name\": \"highestRated\",\n \"return\": {\n \"type\": \"string\"\n }\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
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"exampleTestcases": "[\"FoodRatings\",\"highestRated\",\"highestRated\",\"changeRating\",\"highestRated\",\"changeRating\",\"highestRated\"]\n[[[\"kimchi\",\"miso\",\"sushi\",\"moussaka\",\"ramen\",\"bulgogi\"],[\"korean\",\"japanese\",\"japanese\",\"greek\",\"japanese\",\"korean\"],[9,12,8,15,14,7]],[\"korean\"],[\"japanese\"],[\"sushi\",16],[\"japanese\"],[\"ramen\",16],[\"japanese\"]]",
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