Visible Alpha Software Engineering interview questions

I applied from my College but company asked students to come their office.There were 4 round 1st coding round (pen paper) ,two technical interviews then HR. First round was coding round in which they asked to write 3 coding questions (Delete Middle node in linked List , Merge two sorted array in place , lowest common ancestor in tree) After 1st round i got shortlisted. Then there were technical interview round. In 1st technical round interviewer they asked me about data structure, database mainly. In 2nd technical round interviewer asked me only one question. I told him some approaches but he was not satisfy. He told me to leave.