Improve Python Code Snippet | Dataford Interview Questions

Analyze a Python code snippet, provide ideas for improvements.

Review the following implementation and propose a cleaner, more efficient version:

def find_duplicates(items):
    duplicates = []
    for i in range(len(items)):
        for j in range(i + 1, len(items)):
            if items[i] == items[j]:
                duplicates.append(items[i])
    return duplicates

The improved function should return each duplicated value once, preserving the order in which its second occurrence is found.

Input: a list of integers. Output: a list of duplicated integers.

Constraints

0 <= len(items) <= 500
-10^9 <= items[i] <= 10^9
Return each duplicated value exactly once
Preserve the order of each value's second occurrence

Function Signature

def find_duplicates(items):

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Problem