Find Duplicates in Array | Dataford Interview Questions

Write a function in your preferred language to find duplicate elements in an array.

Return each duplicated value once, in the order its second occurrence is encountered. Use def find_duplicates(arr):; the input is a list of integers and the output is a list of integers. Return [] when no value appears more than once. Assume 0 <= len(arr) <= 10^4.

Constraints

0 <= len(arr) <= 10^4
Each element is an integer
Each duplicated value appears once in the output
Output order follows the order in which values become duplicates

Function Signature

def find_duplicates(arr):

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Problem

Write a function in your preferred language to find duplicate elements in an array.

Constraints

0 <= len(arr) <= 10^4
Each element is an integer
Each duplicated value appears once in the output
Output order follows the order in which values become duplicates

Function Signature

def find_duplicates(arr):

Your question is Find Duplicates in Array. 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.