Wavenet Solutions interview questions

I was a fresher then and jobless. I got selected for the interview because of my research project. And they kept me waiting for 3 hours. Then a C language round followed by a Tree Algorithm. I would love to know that back in 2015 which of their hardware was implementing tree kn their embedded firmware part. Now I have experience of 6 years, I have blacklisted the company since my start of career. After first round itself, they asked nothing. I was shocked. For that humiliation during that interview. At that time I had no sense of what is right or wrong. All i blamed myself for their behaviour. Poor fellows avoid going.

Got call from a recruiter regarding open position. Interview schedule after shortlisting within 2 weeks. 2 technical rounds + 1 hr round. Interviewers were quite frank. Decent experience overall. Coding not required for DS questions, only logic