I applied through a recruiter. The process took 1 day.

The first round was technical and mostly covered everything from OS to Programming languages. But it did not cover algorithms.

The second round was in Chennai, and this round was more on the architecture that I have followed, and on the resume, Algo and DS. It was really a great round, because the interviewer really pushed me hard for finding the solutions in the best time. And the interviewer made sure the environment was more like a discussion, rather than an interview.

Find the minimum element in stack in O(1).