DP World Senior Software Engineer interview questions

Initial coding challenge followed by L2 interview, where problem statement was shared and I was required to solve on my IDE. I was able to solve it after few iterations of testing with small lines of code having sorting complexity. By his reaction interviewer was like how it can be solved in such small method. He tried multiple inputs and it worked for all. I explained him the flow and he was like ' your code is generating right output, send me the code and i will check it again' carelessly. I sent him over mail and after couple of days got rejection mail for which I didnt get any reason whatsoever. Seems like he wanted exact same answer which is fit in his mind. Thank God i am not there in such environment. Advice to Management : Always have interviewer who is interested and open-minded in taking it rather wasting time of both.