#include <iostream>
#include <list>
#include <string>

class YoutubeChannel
{
    private:
        std::string name;
        int subscribersCount;
        std::list<std::string> videoList;

    protected:
        std::string ownerName;
        int contentQuality=0;

    public:
        YoutubeChannel(std::string _name, std::string _owner)
        {
            name = _name;
            ownerName = _owner;
            subscribersCount = 0;
        }

        void subscribe()
        {
            subscribersCount++;
        }

        void unsubscribe()
        {
            if (subscribersCount > 0)
                subscribersCount--;
            else
            {
                std::cout << "Can't unsubscribe this channel" << std::endl;
            }
        }

        void pub_video(std::string v)
        {
            videoList.push_back(v);
        }

        void qualityCheck()
        {
            std::cout<<contentQuality<<std::endl;
            if(contentQuality<5)
            {
                std::cout<<"The quality of "<<name<<" channel is bad."<<std::endl;
            }
            else
            {
                std::cout<< name << " has great quality!"<<std::endl;
            }

        }
        void show_info()
        {
            std::cout << "**************************" << std::endl;
            std::cout << "Name: " << name << std::endl;
            std::cout << "Owner: " << ownerName << std::endl;
            std::cout << "Subscribers: " << subscribersCount << std::endl;
            std::cout << "Videos:" << std::endl;
            for (std::string _value : videoList)
            {
                std::cout << "\t" << _value << std::endl;
            }
            std::cout << "**************************" << std::endl;
        }
};

class CookingYoutubeChannel : public YoutubeChannel
{
    public:
        CookingYoutubeChannel(std::string name, std::string ownerName) : YoutubeChannel(name, ownerName) {}

        void practice()
        {
            std::cout << ownerName << " is practicing cooking..." << std::endl;
            std::cout << ownerName << "'s channel has gained 1 content quality point." << std::endl;
            contentQuality++;
        }
};

class SingingYoutubeChannel : public YoutubeChannel
{
    public:
        SingingYoutubeChannel(std::string name, std::string ownerName) : YoutubeChannel(name, ownerName) {}

        void practice()
        {
            std::cout << ownerName <<" is practicing cooking..." << std::endl;
            std::cout << ownerName << "'s channel has gained 1 content quality point." << std::endl;
            contentQuality++;
        }
};