Detecting Duplicate Entries | Dataford Interview Questions

Write a program that detects duplicate entries in a list.

Implement find_duplicates(items) to return each duplicated value once, in the order its second occurrence is encountered. Return an empty list when no value appears more than once. The input contains integers, and the returned list must preserve detection order.

Constraints

0 <= len(items) <= 10000
Each item is an integer
Return each duplicated value only once
Preserve the order in which duplicate values are first detected

Function Signature

def find_duplicates(items):

Your question is Detecting Duplicate Entries. Start with the requirements in the Question tab.

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Problem

Write a program that detects duplicate entries in a list.

Constraints

0 <= len(items) <= 10000
Each item is an integer
Return each duplicated value only once
Preserve the order in which duplicate values are first detected

Function Signature

def find_duplicates(items):

Your question is Detecting Duplicate Entries. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.