I had to go through two back to back interview on campus. First one, I think I excelled. Second one, the interviewer cancelled my solution approach in few seconds, which I later checked would have lead to the different but correct solution. Then he guided the solution, I think followed just fine and came to the solution. My fear of being perceived as inadequate while guided by the interviewer came true, and I didn't get the offer. Then they told me to improve on my data structure and algorithm skill. At this point I don't know how to improve those!