#include <iostream>
#include <ranges>

struct MyRange
{
    using value_type = int;
    
    struct Iterator
    {
        using iterator_category = std::input_iterator_tag;
        using value_type = typename MyRange::value_type;
        using difference_type = std::ptrdiff_t;
        using pointer = value_type*;
        using reference = value_type&;
        
        
        Iterator& operator++()
        {
            return *this;
        }
        
        Iterator operator++(int)
        {
            return Iterator{};
        }
        
        bool operator == (const Iterator& other)
        {
            return true;
        }
    
        bool operator != (const Iterator& other)
        {
            return !(*this == other);
        }
        
        int operator*()
        {
            return 0;
        }

    };
    
    Iterator begin() const
    {
        return Iterator{};
    }
    
    Iterator end() const
    {
        return Iterator{};
    }
    
};

int main()
{
    static_assert(std::ranges::range<MyRange>);

    return 0;
}