Method count

lesson6-Segmentation/json.hpp:16506–16516

    }

    size_type count(const Key& key) const
    {
        for (auto it = this->begin(); it != this->end(); ++it)
        {
            if (it->first == key)
            {
                return 1;
            }
        }
        return 0;
    }

    iterator find(const Key& key)
    {