search suggestions system

class Solution {
public:
    vector<vector<string>> suggestedProducts(vector<string>& products, string searchWord) {
        map<string, vector<string>> list;

        for(auto& word : products){
            string prefix;
            for(auto& letter : word){
                prefix += letter;
                list[prefix].emplace_back(word);
            }
        }


        vector<vector<string>> ans;
        string prefix;
        for(auto& letter : searchWord){
            prefix += letter;
            auto& curr = list[prefix];

            sort(curr.begin(), curr.end());

            vector<string> tmp;
            for(int i = 0; i < min(3, (int)curr.size()); i++){
                tmp.emplace_back(curr[i]);
            }
            ans.emplace_back(tmp);
        }

        return ans;
    }
};