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ArithmeticSlicesII-Subsequence2.py
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ArithmeticSlicesII-Subsequence2.py
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class Solution:
def numberOfArithmeticSlices(self, A):
"""
:type A: List[int]
:rtype: int
"""
n = len(A)
needDiffCount = {}
s = A.copy()
result = 0
for i in range(1, n):
if A[i] in needDiffCount:
for key, value in needDiffCount[A[i]].items():
need = A[i] + key
result += value
if need in s:
if need not in needDiffCount:
needDiffCount[need] = {}
needDiffCount[need][key] = needDiffCount[need].get(key, 0) + value
for j in range(i):
diff = A[i] - A[j]
need = A[i] + diff
if need in s:
if need not in needDiffCount:
needDiffCount[need] = {}
needDiffCount[need][diff] = needDiffCount[need].get(diff, 0) + 1
s.remove(A[i])
return result
if __name__ == '__main__':
A = [int(num) for num in input().split()]
solution = Solution()
print(solution.numberOfArithmeticSlices(A))