---ini-enunciat

>>> from desnivell import desnivell_acumulat

>>> desnivell_acumulat(iter([0, 110, 200, 350]))
350
>>> desnivell_acumulat(iter([3000, 2800, 2767, 2522]))
0
>>> desnivell_acumulat(iter([0, 100, 200, 100, 300, 0]))
400
>>> l1 = [2000, 2100, 2215, 2350, 2300, 2405, 2510, 2677, 2730,
...       2800, 2680, 2546, 2500, 2566, 2600,
...       2517, 2384, 2242, 2200, 2367, 2380, 2400, 
...       2342, 2339, 2272, 2228, 2200]
>>> desnivell_acumulat(iter(l1))
1150

---fi-enunciat

>>> desnivell_acumulat(iter(range(501)))
500
>>> l2 = [500, 512, 524, 491, 502, 413, 458, 540, 530, 501, 568, 481, 457, 380, 430, 398, 449, 391, 298, 199]
>>> desnivell_acumulat(iter(l2))
330