Microsoft Software Development Engineer II interview questions

It was a weekend drive. I was constantly getting calls to interview for Hyderabad location. As I wanted to stay in Bangalore, I was ignoring those calls. Then recruiter called me to attend it on a Saturday. More than 50 candidates turned up for the interview. Round 1: He asked qns on array problems, and then he asked about how would you go about it while using C++, simple problems only - like binary search etc. I was confident and answered all qns and thought I would clear round 1. He then told to wait outside and HR will tell feedback. HR called me and told I can leave for the day. I did not like it when I was not given any feedback at all about what I missed for the interview.