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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.

Hard Stack OA Questions | OAHelper

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Hard Stack OA Questions

Practice 27+ hard Stack coding questions from real online assessments. Filter by company, solve in the OAHelper editor, and prepare for company-wise OAs.

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rubrik

Hard

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Largest Rectangle in HistogramvisaHard

Maximal Rectangleplutus researchHard

Total Distinct DifferencesamazonHard

Total Packing EfficiencyamazonHard

Flatten the MountainsalgouniversityHard

Second next greater elementbreeHard

Unfair MultiversehighradiusHard

Debugging - Finding subsequencezetaHard

Question 10ibmHard

ParkoursprinklrHard

Minimum Complexity LeveltypefaceHard

Trapping Rainwater Problemzl technologiesHard

Second Next Greater ElementnexcusHard

Falling BananastredenceHard

Largest Square Area in CitylineziprecruiterHard

Maximum Entrance Code GeneratoflipkartHard

Stabilize the Skylinejosh technologyHard

Largest Rectangle in HistogrammedianetHard

Sales Pattern AnalysisamazonHard

Laptop assembly goldman sachsHard

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