Package g2301_2400.s2353_design_a_food_rating_system

Class FoodRatings

  • public class FoodRatings
extends Object
    2353 - Design a Food Rating System\. Medium Design a food rating system that can do the following: * **Modify** the rating of a food item listed in the system. * Return the highest-rated food item for a type of cuisine in the system. Implement the `FoodRatings` class: * `FoodRatings(String[] foods, String[] cuisines, int[] ratings)` Initializes the system. The food items are described by `foods`, `cuisines` and `ratings`, all of which have a length of `n`. * `foods[i]` is the name of the ith food, * `cuisines[i]` is the type of cuisine of the ith food, and * `ratings[i]` is the initial rating of the ith food. * `void changeRating(String food, int newRating)` Changes the rating of the food item with the name `food`. * `String highestRated(String cuisine)` Returns the name of the food item that has the highest rating for the given type of `cuisine`. If there is a tie, return the item with the **lexicographically smaller** name. Note that a string `x` is lexicographically smaller than string `y` if `x` comes before `y` in dictionary order, that is, either `x` is a prefix of `y`, or if `i` is the first position such that `x[i] != y[i]`, then `x[i]` comes before `y[i]` in alphabetic order. **Example 1:** **Input** ["FoodRatings", "highestRated", "highestRated", "changeRating", "highestRated", "changeRating", "highestRated"] [[["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"]] **Output:** [null, "kimchi", "ramen", null, "sushi", null, "ramen"] **Explanation:** FoodRatings foodRatings = new FoodRatings(["kimchi", "miso", "sushi", "moussaka", "ramen", "bulgogi"], ["korean", "japanese", "japanese", "greek", "japanese", "korean"], [9, 12, 8, 15, 14, 7]); foodRatings.highestRated("korean"); // return "kimchi" // "kimchi" is the highest rated korean food with a rating of 9. foodRatings.highestRated("japanese"); // return "ramen" // "ramen" is the highest rated japanese food with a rating of 14. foodRatings.changeRating("sushi", 16); // "sushi" now has a rating of 16. foodRatings.highestRated("japanese"); // return "sushi" // "sushi" is the highest rated japanese food with a rating of 16. foodRatings.changeRating("ramen", 16); // "ramen" now has a rating of 16. foodRatings.highestRated("japanese"); // return "ramen" // Both "sushi" and "ramen" have a rating of 16. // However, "ramen" is lexicographically smaller than "sushi". **Constraints:** * 1 <= n <= 2 * 104 * `n == foods.length == cuisines.length == ratings.length` * `1 <= foods[i].length, cuisines[i].length <= 10` * `foods[i]`, `cuisines[i]` consist of lowercase English letters. * 1 <= ratings[i] <= 108 * All the strings in `foods` are **distinct**. * `food` will be the name of a food item in the system across all calls to `changeRating`. * `cuisine` will be a type of cuisine of **at least one** food item in the system across all calls to `highestRated`. * At most 2 * 104 calls **in total** will be made to `changeRating` and `highestRated`.

    • Constructor Detail

      • FoodRatings

        public FoodRatings​(String[] foods,
                   String[] cuisines,
                   int[] ratings)

    • Method Detail

      • changeRating

        public void changeRating​(String food,
                         int newRating)

      • highestRated

        public String highestRated​(String cuisine)