Find Duplicates in a List | Dataford Interview Questions

Find the duplicates in a list in the order they appear.

Asked in the R2 Technical Managerial stage. Python coding question.

Write a function that takes a list of integers and returns the duplicate values in the order they are first detected as duplicates. A value should appear in the output only the first time it repeats, even if it occurs more than twice.

Function Signature

def find_duplicates(nums):

Input

nums: a list of integers

Output

Return a list of integers containing each duplicated value once, in the order their second occurrence appears.

Constraints

0 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
The output must contain each duplicated value at most once

Function Signature

def find_duplicates(nums):

Your question is Find Duplicates in a List. 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.

Problem

Find the duplicates in a list in the order they appear.

Asked in the R2 Technical Managerial stage. Python coding question.

Function Signature

def find_duplicates(nums):

Input

nums: a list of integers

Output

Return a list of integers containing each duplicated value once, in the order their second occurrence appears.

Constraints

0 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
The output must contain each duplicated value at most once

Function Signature

def find_duplicates(nums):

Your question is Find Duplicates in a List. 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.