Cyberscience Graduate Software Engineer interview questions

The interviewer rejected me and terminated the interview midway despite me successfully solving an easy coding problem. I was told that I took too long to solve and explain my coding. However I took long because I was explaining my solution in depth (which should have got me more credit) however the interviewer said this was completely unnecessary and rejected me instantly! It is unprofessional to terminate an interview midway based on a solved interview problem. I feel that more interview questions should have been given before making a rational informed decision. In my opinion this interview alone is testament to the working culture of Cyberscience.