Google Intern interview questions

After applying through the Google Jobs website, I was reached out to by a member of their People Operations team. I had a short telephone interview with one of the recruiters, then 2 telephone interviews with members of the team I would be joining, and then an offer. The whole process was very well organised and swift.

Referred by a friend. Get email from HR pretty soon. Scheduled three crazy interviews on the same day in the next month. Three guys from different teams interviewed me. Answered two questions for each interview in the first two rounds. Only answered one in the last one. A pretty new question, some thing like search common ancestors in several DAGs.