Google Engineering Residency Program interview questions

I was contacted by a recruiter after applying online after about a week. I set up a phone call with the recruiter then set up two technical interviews.

First got an interview call from a software engineer, university grad position. later got converted to Engineering residency program after the coding test of 2 questions. I then invited to 2 phone interview rounds where you'll have later a phone interview and a hangout interview, interviews include algorithms and data structures concepts