NVIDIA Software Developer interview questions

Interview process was so so disorganized that it was hard to believe Nvidia would fall under this category. Had a round of phone interview and was called on site for a whole day of interviews. I thought I did all the interviews pretty well and was hoping to hear about an offer. They call me after two weeks saying they want to schedule another day of on site interviews. Very strange but I was relieved that they got back to me finally! Did a whole day of interviews on -site and phone interview with a senior manager of the whole team. After an agonising 2 weeks of waiting, they got back me via phone and email saying I got the offer. I was super excited as I liked the job profile of the position immensely. The HR then called me to ask about what I was expecting and explained the benefits etc. After I week, I still had no offer letter or communication except the email before, and I tried to get in touch with the HR. They never picked up or replied to my emails. Finally after one more week, the HR got back to me saying the position was removed and like you can try applying to other positions in the company. Seriously, a very unfair move on their side. Making me attend interview one after the other, prolong the process for 2.5 months, give me the offer and take it back afterwards. Totally lost all my regards for the recruiting process and HR, wasting my time,their time and playing with my morale!! They should have atleast helped consider me for other positions within the company but they never did!