They got back to be in 2 days and told me to do a 15 min hackerrank challenge. The thing is until now, I still don't know that the question was actually asking about. The problem is supposed to be easy, but the description of the problem itself can't even fit in my 15inch screen. By the time I finish reading the description (which is poorly written), I got 10 min to implement and debug, then just to realize the question was asking for something else. This is especially not friendly to people who's first language is not english but are excellent at solving problems. If you want to hire the best coders out there, you need to cut down the problem description and let us focus on the actual problem. This is the worst experience I ever had.