I disagree. What do you see so different in that blog post ? OP is struggling with interview puzzles not concepts of data structure, common algorithms. I think

I disagree. What do you see so different in that blog post ? OP is struggling with interview puzzles not concepts of data structure, common algorithms. I think it is far too easy to devise a problem that even most current interviewers would fail. I'm saying this after being hired and seeing the level of knowledge most interviewers possess.