Meta Software Engineer interview questions

I met the recruiter at a career fair. He was really helpful and scheduled me for an interview within the same week. I had a phone interview with one of the software engineers and was asked to code three technical problems. The first one was a list of anagrams and the other two were related to levelorder traversal of binary trees.

The process consisted of an onsite interview in Buenos Aires. It was a 30 minutes interview in which I had to answer 2 different problemas. After that they invited me to interview again in Menlo Park.