Помогите решить задачу через С++

 #include  

#include  

#include  

#include  

using namespace std; 

void flush(istream& inp) { 

    inp.ignore(0x1000, '\n'); 

} 

struct itc { 

    unsigned call_duration; 

    double rate; 

    string city; 

    string date; 

private: 

    friend bool operator>(istream& inp, itc& tc) { 

        cout  tc.call_duration; 

        flush(inp); 

        return inp; 

    } 

}; 

class billing { 

public: 

    void add(const itc& tc) { 

        table.push_back(tc); 

    } 

    itc find_min()const { 

        return *min_element(table.begin(), table.end()); 

    } 

    vector select(const string& city)const { 

        vector suit; 

        for (const auto& item : table) { 

            if (item.city == city) { 

                suit.push_back(item); 

            } 

        } 

        return suit; 

    } 

private: 

    vector table; 

}; 

int main() { 

    cout > n; 

    flush(cin); 

    puts(""); 

    itc tc; 

    billing table; 

    for (size_t i = 0; i < n; ++i) { 

        cin >> tc; 

        table.add(tc); 

    } 

    const auto min = table.find_min(); 

    cout

 class IInfo

{

public:

  virtual const Date& data() const = 0;

  vurtual const std::string& city() const = 0;

  virtual double duration() const = 0;

  virtual double price() const = 0; 

};



class IInfoList

{

public:

  virtual void add( const IInfo* pInfo ) = 0;

  virtual const std::string& minimalPriceCity() const = 0;

  virtual void collectDates( const std::string& city, DateList& list ) const = 0;

  virtual double totalPrice( const std::string& city ) const = 0;

};