es1AlberiPython

def sommaNodi(A):
    if isNull(left(A)) and isNull(right(A)):  #nodo foglia --> passo base!
        return info(A)

    somma = info(A)

    if not isNull(left(A)):
        somma += sommaNodi(left(A))

    if not isNull(right(A)):
        somma += sommaNodi(right(A))

    return somma

def sommaNodiPRO(A):
    if isNull(A):
        return 0
    return info(A) + sommaNodiPRO(left(A)) + sommaNodiPRO(right(A))