With that logic the whole point of interview is invalid. Because you can take anyone and teach them what to do :) Imho the idea of simple question is to check b

With that logic the whole point of interview is invalid. Because you can take anyone and teach them what to do :) Imho the idea of simple question is to check basic understanding of data structures. It is not about checking if someone can apply to some problem red-black tree... Queue and Stack are basic things every programmer imho will know no matter what time of the day or night it is.