COMPLEJIDAD PREORDEN

                                                                              //O(1)
    private void  preOrden(NodoBin<T> r, ListaCD<T> l){                         //T=1+MAX(2+2+2,0) = 1+2+2+2 = 7
        if(r!=null){                                                            //1+MAX
            l.insertarAlFinal(r.getInfo());                                 //2
        preOrden(r.getIzq(), l);                                             //2
        preOrden(r.getDer(), l);                                              //2
        }
    }
T=1+MAX(2+2+2,0)
T=1+2+2+2 = 7

T=7

O(1)