Qualcomm Software Engineer interview questions

I had applied online for the position and a recruiter contacted and set up the interview. The interviewer directly jumped to coding question. Asked to share screen and start coding.

There were 2 technical rounds and 1 HR round. The first technical interview involved a coding question of medium level , some OS concepts and a puzzle. The second interview was a complete coding round , with a Hard level code to be written from scratch in most optimised way.