I was referred to the interview by an employee. The interview process was very impersonal, with canned email responses and literally no connection between the recruiter and the applicant.

The recruiter persistently ignored my questions regarding team assignments. I had only one interview, with the "collaborative" coding question asked within the first 15 seconds of picking up the phone.

Poor English skills of the interviewer and their unwillingness to provide any hints were extremely unexpected. Despite providing the complete theoretical solution to the problem, the interviewer toyed with me, not finding a small mistake in the code.

After "deciding to move forward with other candidates," the recruiter declined to provide any feedback on the application. Undeniably, it's a great place to work, but the recruiting process left a bad taste in my mouth.

Question selected from the ones already provided.

Revise your data structures and their implementation in your language of choice.