McKesson Software Development Engineer interview questions

Group interview consisted of ~20 people. We were given a brief tour of the company and a quick demo of one of their software products. The group split into groups of four/five and worked through a coding problem (find the bug(s)) and then present our solution. We then moved into a conference room and worked individually to work through a question sheet. The group interview process was unique and I never heard or been to anything similar. Overall, it wasn't very difficult, but we were told at the end that there was only one position.