VMware Intern interview questions

I applied for Intern position through reference and I got a call in three days time after the application. It was 3 rounds having two technical interviews and one round of managerial/behavioral round. - First got a call from HR, who asked about my background, previous projects and my proficiency level in each programming language. - both the technical rounds was telephonic with Hackerrank's codepair to write programs/explain algorithms. - First technical round was relatively easy and I was asked to explain about my project and my coding contribution from the project and how it could be improved in terms of performance and also very basics of Operating System related to memory management.Also few relatively easy algorithms and Data structures related questions were asked. - Second round was relatively tougher with lots of OS related questions and programs related to muti-threading, Semaphores/mutex related programs. Algorithms questions related to Data structures like Queues, Linked list and explaining time complexity of such algorithms.