442. Find All Duplicates in an Array - LeetCode Solution

Array

Python Code: 

class Solution:
    def findDuplicates(self, nums: List[int]) -> List[int]:

        s = []




        for i in range(len(nums)):

            ind = int(fabs(nums[i])) - 1

            if nums[ind] < 0:
                s.append(ind+1)

            nums[ind] = - nums[ind]


        return s


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