#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <iterator>
#include <functional>
#include <cctype>
 
template<typename Func>
struct compare
{
    bool operator()(const std::string& lhs, const std::string& rhs)
    {
        std::string lhs_temp(lhs), rhs_temp(rhs);
        std::transform(lhs_temp.begin(), lhs_temp.end(), lhs_temp.begin(), tolower);
        std::transform(rhs_temp.begin(), rhs_temp.end(), rhs_temp.begin(), tolower);
        return Func()(lhs_temp, rhs_temp);
    }
};
 
int main()
{
    setlocale (0, "Russian");
    std::vector<std::string> vs = {"Qwerty", "QWERTY", "Медвед","Прэвэд","Медвед","Медвед","Стакан", "ПрЭвЭд",
        "Пока","Хой","Медвед","Водка","Хой","Хой","Водка","Стакан", "МЕДВЕД"};
 
 
    std::cout<<"Все слова:\n";
    std::copy(vs.begin(), vs.end(), std::ostream_iterator<std::string>(std::cout, "\n"));
 
    std::cout<<"\nУникальные слова (без учета регистра):\n";
    std::sort(vs.begin(), vs.end(), compare<std::less<std::string> >());
    std::unique_copy(vs.begin(), vs.end(), std::ostream_iterator<std::string>(std::cout, "\n"), compare<std::equal_to<std::string> >());
 
    std::cout<<"\n";
   // system("pause");
    return 0;
}

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