Finding Duplicates Efficiently | Dataford Interview Questions

Write a Python program to find duplicates in a list using a nested loop, and then optimize it using a dictionary or set.

Implement def find_duplicates(nums):, returning each duplicated value once, in the order it is first detected as a duplicate. The input is a list of integers, and the output is a list of integers.

Constraints

0 <= len(nums) <= 10^4
-10^9 <= nums[i] <= 10^9
Return each duplicated value at most once
Preserve the order in which duplicate values are first detected

Function Signature

def find_duplicates(nums):

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Problem

Write a Python program to find duplicates in a list using a nested loop, and then optimize it using a dictionary or set.

Implement def find_duplicates(nums):, returning each duplicated value once, in the order it is first detected as a duplicate. The input is a list of integers, and the output is a list of integers.

Constraints

0 <= len(nums) <= 10^4
-10^9 <= nums[i] <= 10^9
Return each duplicated value at most once
Preserve the order in which duplicate values are first detected

Function Signature

def find_duplicates(nums):

Your question is Finding Duplicates 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.