IBM Software Developer interview questions

2 round onsite interviews after one online assessment. The first one was seriously tech interview last for about 2.5 hours with algorithm questions and request you to write on the white board. The second round was originally with VP but finally with 4 team lead due to updated schedule. It took about 1 hour talking about your experience your preference and to solve some problems during the interview. It is like to provide the solutions of the real problem they meet. I was nervous at that time. And then I tried to calm down and discuss whatever I thought with them, like a brain storm. And finally I found one.