Booking.com Developer interview questions

A hackerrank challenge, very easy one a phone recruiter interview technical phone interview onsite interviews The recruiter was awesome, the developers on the technical interview were kinda ok... they just knew nothing about the language I was using so failed to see the disadvantages it carried for solving the task the way they wanted it.

The process was about 4 steps. First step, an interview with the recruiter about your background. Second, an online algorithm test of 4 questions(hackerrank system), you have to solve them in one hour. You just need 70% to pass the test and the results are automatically. Third step, a technical interview and last step a face to face interview.