Queues
A container of objects that are inserted and removed according to the first-in, first-out principle.
Interview Problems
Why do I see duplicate challenges? You'll see duplicates because a question may fall into different categories. We keep them here bec ause we believe that it is good to sporadically review old challenges. They are optional if already completed-- but reviewing them (and more importantly redoing them with the new knowledge) will ensure that you've let the material sink in.