Find Duplicates in Array | Dataford Interview Questions

Solve a typical algorithmic challenge, such as finding duplicates in an array.

Implement find_duplicates(nums) to return each distinct duplicated value once, ordered by its second occurrence while scanning from left to right.

Input: A list of integers. Output: A list of integers containing all values that occur at least twice. Return an empty list when no duplicates exist.

Constraints

0 <= nums.length <= 10^4
-10^9 <= nums[i] <= 10^9
Return each duplicated value exactly once
Order the result by second occurrence during the left-to-right scan

Function Signature

def find_duplicates(nums):

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