COMPLEJIDAD LUCA

                                                                         //O(1)
    private String Luca(NodoBin<T> r){                             //T= 1+MAX(1,0)+6 = 7
        if(r==null)                                                             //1
        return("b");                                                            //1
        return("a"+Luca(r.getIzq())+Luca(r.getDer()));                     //6
    }
T= 1+MAX(1,0)+6 = 7

T=7

O(1)