Practice
Resources
Contests
Online IDE
New
Free Mock
Events New Scaler
Practice
Improve your coding skills with our resources
Contests
Compete in popular contests with top coders
Events
Attend free live masterclass hosted by top tech professionals
New
Scaler
Explore Offerings by SCALER

Common Elements

Problem Description

Given two integer arrays, A and B of size N and M, respectively. Your task is to find all the common elements in both the array.

NOTE:

• Each element in the result should appear as many times as it appears in both arrays.
• The result can be in any order.

Problem Constraints

1 <= N, M <= 105

1 <= A[i] <= 109

Input Format

First argument is an integer array A of size N.

Second argument is an integer array B of size M.

Output Format

Return an integer array denoting the common elements.

Example Input

Input 1:

``` A = [1, 2, 2, 1]
B = [2, 3, 1, 2]```

Input 2:

``` A = [2, 1, 4, 10]
B = [3, 6, 2, 10, 10]```

Example Output

Output 1:

` [1, 2, 2]`

Output 2:

` [2, 10]`

Example Explanation

Explanation 1:

` Elements (1, 2, 2) appears in both the array. Note 2 appears twice in both the array.`

Explantion 2:

` Elements (2, 10) appears in both the array.`

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
Hints
• Hint 1
• Solution Approach
• Complete Solution

Discussion

Free Mock Assessment
Fill up the details for personalised experience.
Phone Number *
OTP will be sent to this number for verification
+1 *
+1
Change Number
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
*Enter the expected year of graduation if you're student
Current Employer
Company Name
College/University Name
Job Title
Job Title
Software Development Engineer (Backend)
Software Development Engineer (Frontend)
Software Development Engineer (Full Stack)
Data Scientist
Android Engineer
iOS Engineer
Devops Engineer
Support Engineer
Research Engineer
Engineering Intern
QA Engineer
Co-founder
SDET
Product Manager
Product Designer
Backend Architect
Program Manager
Release Engineer
Data Analyst
Data Engineer
Non Coder
Other
Edit
Resend OTP
By clicking on Start Test, I agree to be contacted by Scaler in the future.