def max_difference(arr):
if len(arr) < 2:
return 0
max_diff = 0
for i in range(1, len(arr)):
diff = abs(arr[i] - arr[i - 1])
if diff > max_diff:
max_diff = diff
return max_diff
lst = [3, 1, 9, 5, 11, 13] # 1, 9 -> 8
print(max_difference(lst))
'''
run:
8
'''