# [Solution] Design a Food Rating System solution leetcode

Design a Food Rating System solution leetcode – 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.

## [Solution] Design a Food Rating System solution leetcode

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.

## [Solution] Design a Food Rating System solution leetcode

```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".
```

## [Solution] Design a Food Rating System solution leetcode

• `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`.