Find Duplicate Elements Efficiently | Dataford Interview Questions

Given an array of integers, how would you find the duplicate elements efficiently?

Implement find_duplicates(nums) to return each value that appears at least twice, exactly once, in the order it is first identified as a duplicate. The input is a list of integers, and the output is a list of integers. For example, [4, 3, 2, 7, 8, 2, 3, 1] returns [2, 3]; [1, 1, 2, 2, 3] returns [1, 2].

Constraints

1 <= nums.length <= 100000
-1000000000 <= nums[i] <= 1000000000
Return each duplicated value exactly once
Preserve the order in which values are first identified as duplicates

Function Signature

def find_duplicates(nums):

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Problem

Given an array of integers, how would you find the duplicate elements efficiently?

Constraints

1 <= nums.length <= 100000
-1000000000 <= nums[i] <= 1000000000
Return each duplicated value exactly once
Preserve the order in which values are first identified as duplicates

Function Signature

def find_duplicates(nums):

Your question is Find Duplicate Elements Efficiently. 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.