Veritas Technologies Senior Software Engineer interview questions

I was scheduled morning interview. There were 3 rounds. 1st technical round was easy. I was asked about my current projects, I'm working on. Easy algorithmic question to place all negative numbers before positive numbers in mixed array. I proposed O(n) solution with O(n) space and other solution with n-square complexity but O(1) space. I was reaching out to logarithmic complexity but interviewer stopped me and said that he was satisfied. I was asked to implement textbook Multithreading program. I did that but seemed like interviewer himself had weak point and didn't knew how we can create multiple threads using same object and how memory is allocated and shared between threads. I had to wait for 2 hours for 2nd round. 2nd interviewer asked me another easy algorithmic question to add 2 binary strings. I did that by using characterwise XOR implementation. After that I was asked to implement multithreading on whiteboard, with n-threads being used to sum up an array of integer. Some other questions on singleton pattern and synchronized keyword were asked, which i answered. 3rd interviewer was engineering manager. He asked me some questions on system scalability and designing a notification service. There was discussion on how timeout works and asynchronized request are used in real world applications. This was the most exciting round. As it was evening by then, I was told that remaining round will happen over telephone. 3 days later, I got mail from Veritas citing that further rounds would not be possible. Overall, the interview management was chaotic with lot of unknown delays and some of the interviewers themselves didn't had clue about approaching the solution from some alternate way.