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class Solution(object):

def numberOfArithmeticSlices(self, A):

"""

:type A: List[int]

:rtype: int

"""

res = 0;

tmp = 1;

for i in range(2, len(A)):

if A[i] - A[i-1] != A[i-1] - A[i-2]:

tmp = 1;

else:

res = res + tmp;

tmp = tmp + 1;

return res;