A recruiter contacted me via LinkedIn, and had an initial coding round, with three questions.

Had f2f arranged and the guy who took my interview wanted to have a whiteboard discussion where I should write the implementation and he would look into his laptop.

I was trying to converse with him.

Got the feedback that I was "not confident" despite solving both the problems.

I had to look up questions on GeeksForGeeks. The interviewer opened it, found a question, and gave it to me.