Задача по работе со строками на языке программировании c++

 #include  

#include  

#include  

#include  

#include 



using namespace std;



struct Word { 

    string word; 

    Word() = default; 

    Word(const string& word) : word(word) {} 

    string trim() { 

        word = trim_space(); 

        word = trim_punct(); 

        return word; 

    } 

private: 

    string trim_space() { 

        word = regex_replace(word, regex(" +"), " "); 

        word.erase(0, word.find_first_not_of(" ")); 

        word.erase(word.find_last_not_of(" ") + 1); 

        return word; 

    } 

    string trim_punct() { 

        return regex_replace(word, regex("[.?!)(,;:]"), ""); 

    } 

};



struct Adjective : public Word { 

    Adjective() = default; 

    Adjective(const string& word) : Word(word) { 

        this->word = trim(); 

    } 

    bool is_singular_nominative_case()const { 

        if (word.length() > 3) { 

            auto ending = string{ word.end() - 2, word.end() }; 

            for (const auto& item : singular_nominative_case) { 

                if (ending == item) { 

                    return true; 

                } 

            } 

        } 

        return false; 

    } 

private: 

    inline static const string singular_nominative_case[]{ 

        "ый", "ий", "ая", "яя", "oe", "ee", "ой" 

    }; 

};



struct Parser { 

    string line; 

    Parser(const string& line) : line(line) { 

        split(); 

    } 

    size_t adjectives_singular_count() { 

        size_t count = 0; 

        for (auto& token : tokens) { 

            Adjective adjective(token); 

            if (adjective.is_singular_nominative_case()) { 

                ++count; 

            } 

        } 

        return count; 

    } 

private: 

    vector tokens; 

    void split() { 

        istringstream iss(line); 

        string token; 

        while (iss >> token) { 

            tokens.emplace_back(move(token)); 

        } 

    } 

};



int main() { 

    system("chcp 1251 > nul"); 

    cout