Initially there was an elimination round, in which they took written test based on C++ (related to virtual functions, pointers). Post that, there was interview round based on data structures. The interviewer tried to give some twist to very general questions, but was expecting same answer without twist. One of the question was "max length sub array having equal number of 0's and 1's". I gave solution using map, but she was expecting solution which doesnt use memory or uses less memory (which is not possible). Another question was run length encoding, given a string "aaaabb" compress to "a4b2", "ab" compress to "a1b1" and to do it inplace. For every question she asked, she said i dont have much time left, you have 5 mins to solve it.