python leetcode 413. Arithmetic Slices
class Solution(object): def numberOfArithmeticSlices(self, A): """ :type A: List[int] :rtype: int """ res=0 if len(A)<3:return 0 pre=A[1]-A[0] index=0 for i in range(2,len(A)): if pre!=A[i]-A[i-1]: if i-index>=3:res+=self.count(i-index) pre=A[i]-A[i-1] index=i-1 if i-index+1>=3:res+=self.count(i-index+1) return res def count(self,n): return sum(i for i in range(1,n-1))
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python leetcode 413. Arithmetic Slices
class Solution(object): def numberOfArithmeticSlices(self, A): """ :type A: List[int] :rtype: int """
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