I was contacted by a recruiter. I had four coding rounds and one behavioral interview.

I thought I performed well in three coding rounds and the behavioral interview. They contacted me three days later and rejected me.

I kept asking the recruiter to give me some feedback: why and in which round I did not perform well? What were the areas I could improve?

However, there was no feedback whatsoever. Absolutely nothing.

I had spent months preparing for the interview, but the recruiter did not even bother to give me a single line of feedback.

3 Graph questions -- I answered well.

1 DP question -- could not come up with a DP solution