You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: c.go
    path of file: ./repos/codeforces-go/leetcode/weekly/303/c
    
    the code of the file until where you have to start completion: package main

import (
	"github.com/emirpasic/gods/trees/redblacktree"
	"github.com/emirpasic/gods/utils"
)

// https://space.bilibili.com/206214/dynamic
type pair struct {
	r int
	s string
}

type FoodRatings struct {
	fs map[string]pair
	cs map[string]*redblacktree.Tree
}

func Constructor(foods, cuisines []string, ratings []int) FoodRatings {
	fs := map[string]pair{}
	cs := map[string]*redbla
    
func Constructor(foods, cuisines []string, ratings []int) FoodRatings {
	fs := map[string]pair{}
	cs := map[string]*redblacktree.Tree{}
	for i, f := range foods {
		r, c := ratings[i], cuisines[i]
		fs[f] = pair{r, c}
		if cs[c] == nil {
			cs[c] = redblacktree.NewWith(func(x, y interface{}) int {
				a, b := x.(pair), y.(pair)
				if a.r != b.r {
					return utils.IntComparator(b.r, a.r)
				}
				return utils.StringComparator(a.s, b.s)
			})
		}
		cs[c].Put(pair{r, f}, nil)
	}
	return FoodRatings{fs, cs}
}