Qualcomm Software Engineer interview questions

A staffing agency connected me to the hiring manager at qualcomm. I then cleared 4 to 5 rounds of interviews to get the job. The interviews focussed on my work profile, programming skills and communication theory

First phone interview, then onsite interview. I interviewed with five staff separately in the company. It took almost 6 hours. I answered almost all of the interview questions. But at the end I guess they were not sure about the task they would employ for the position. They asked me to write a few codes for ordering numbers on the board.