Design a Food Rating System LeetCode solution in C++

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class FoodRatings {
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 public:
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  unordered_map<string, set<pair<int, string>>> cuisine_ratings;
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  unordered_map<string, string> food_cuisine;
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  unordered_map<string, int> food_rating;
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  FoodRatings(vector<string> &foods, vector<string> &cuisines, vector<int> &ratings) {
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    for (int i = 0; i < foods.size(); ++i) {
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      cuisine_ratings[cuisines[i]].insert({-ratings[i], foods[i]});
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      food_cuisine[foods[i]] = cuisines[i];
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      food_rating[foods[i]] = ratings[i];
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    }
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  }
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  void changeRating(string food, int newRating) {
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    auto &cuisine = food_cuisine.find(food)->second;
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    cuisine_ratings[cuisine].erase({-food_rating[food], food});
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    cuisine_ratings[cuisine].insert({-newRating, food});
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    food_rating[food] = newRating;
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  }
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  string highestRated(string cuisine) {
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    return begin(cuisine_ratings[cuisine])->second;
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  }
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};