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class Solution(object):

def findDuplicates(self, nums):

"""

:type nums: List[int]

:rtype: List[int]

"""

res = [];

for i in range(0, len(nums)):

if nums[i] > 0:

if nums[nums[i]-1] < 0:

res.append(nums[i]);

else:

nums[nums[i]-1] = -nums[nums[i]-1];

else:

if nums[-nums[i]-1] < 0:

res.append(-nums[i]);

else:

nums[-nums[i]-1] = -nums[-nums[i]-1];

return res;