Pregunta de entrevista de Groupon

First round - Coding Implement LRU cache using hashmap of key and doubly linked list, how will you refactor the code Second round - Design Design booking reservation system like bookmyshow Draw different services involved in online drawing tool. Draw the diagram neatly as they will take snapshot of the diagram at end of the interview and evaluate your performance on same diagram later. No matter how well you verbally explain things, put everything in the diagram as the diagram will get evaluated later.