Company OAs DSA Sheet All Problems Placement Data Interview Experiences Premium

Built by students, for students — practice company-specific OAs, DSA sheets, and real interview experiences to land your dream role.

Ready to crack your next OA?

Practice company-specific questions trusted by thousands of students across India.

Start Practicing Go Premium

OA Practice·DSA·Placements

Disclaimer: OAHelper is an independent educational platform. We (oahelper.in) do not own the images or questions shown. Content is uploaded by users.

Coding Topic

Hash Table OA Questions

Practice 535+ Hash Table coding questions from real online assessments. Filter by company, solve in the OAHelper editor, and prepare for company-wise OAs.

easy Hash Table medium Hash Table hard Hash Table

QuestionCompanyDifficulty

Online OccurrencesciscoHard Spell Fragmentation DecodernokiaHard Sequential Message DecodernokiaMedium

Online Grocery Order Management

nokia

Medium

Word PuzzleciscoHard

Word SearchciscoHard

Library Book Circulation Trackerhudson river tradingMedium

Travel Photoshudson river tradingMedium

Almost MatchingoptiverMedium

CryptarithmoptiverHard

Shortest Substringernst & youngMedium

Longest Contiguous Subarray with Unique Bit CountsamazonEasy

Resource Locking in an m-Ary TreeamazonHard

In-Memory Cache with Eviction PolicieskaigenticHard

Second Most Frequent ElementibmEasy

Algorithms: K timesernst & youngEasy

Minimum Operations to Process PackagesamazonMedium

Hacker: Root PasswordlegalzoomEasy

Java: Library StructurepaypalEasy

New Network ProtocolakamaiMedium

String ChainsakamaiMedium

Common SubstringcarousellEasy

Meeting Room AvailabilityibmEasy

Category Browse EngineamazonMedium

C++: Return RoutingamazonMedium

Banking System Level 2truecallerMedium

C++: Return Routing EngineamazonMedium

Simplified Banking System ImplementationtruecallerHard

Question 2: MovieDB WatchlistamazonMedium

Question 1amazon sde1 1mayMedium

Longest Contiguous HousesautodeskMedium

Code Question 2amazonMedium

Satellite Signal ProcessinginfosysHard

Discrete Structures: Comparison of Discrete Valuestiger analyticsEasy

Kid PhotographyalgouniversityMedium

HackerCardsibmEasy

Largest Palindromic Numberpublicis sapientMedium

Salesforce Pair SumssalesforceEasy

Kid PhotographyalgouniversityHard

Subarray Sums Divisible by Kalgo universityMedium

Television Rating Point Calculationmorgan stanleyMedium

Two Sumoahelper-practiceEasy

Modified KnapsackhackerearthMedium

Case Management System SortingsalesforceEasy

Complementary PairsnebiusMedium

Shortest Substring Containing CharactersnebiusMedium

Smart SalenebiusMedium

Question 1jpmorgan chaseMedium

Code Question 2amazonHard

Server Redirection BugamazonHard

All topics All problems Company-wise OA questions cisco OA questions nokia OA questions nokia OA questions nokia OA questions cisco OA questions cisco OA questions

Hash Table OA Questions | OAHelper