#include "node.cpp"

class zip{
    zip * _left,
        * _right,
    node * _data;
public:
    zip(zip * tree, node * data)
    {
        if (tree->_data->key() < data->key())
        {
            _left = tree;
        }
        else
        {
            _right = tree;
        }
    }
};