>>> from diferencies import classifica_difs

>>> lm1 = [1, 3, 5, 8]
>>> classifica_difs(lm1, 0, 10)
(2, 0)

>>> lm2 = [0, 10, 10, 0, 5, 5]
>>> classifica_difs(lm2, 0, 10)
(2, 1)

>>> lm3 = []
>>> classifica_difs(lm3, 0, 10)
(0, 0)

>>> lm4 = [-1, 2, 7, 20, 3, 4, 0, 10]
>>> classifica_difs(lm4, 0, 10)
(4, 0)

>>> ln6 = [-5, -3, -2, -1, -1, -2, -6, 0]
>>> classifica_difs(ln6, -5, -1)
(3, 1)