I applied through a staffing agency, and the process took six days.

• First round: Three questions on forests that were of medium difficulty. I cleared it.
• Second round: A phone interview. I got rejected because they thought I googled the answers, but I didn't, which is very sad and ironical.
• Third round: A hackathon, which unfortunately I couldn't attend.

They probably ask you to rotate a cube, which sounds easy but is very difficult. How will you represent a 3D cube in 2D? Think about it once. It is challenging, isn't it? The first round questions are just like what you find on Quora.

The phone interview questions included making a data structure that takes $O(1)$ time for adding, deleting, and searching an element. There was one answer.

Another question was how to sort 1TB of data using ten 256MB RAMs, meaning you can only perform operations on 256MB in one RAM and put it back in the 1TB storage.

The last question on the phone interview was how to search for names in a large list: basically, if you type 'a', all the names starting with 'a' come up, and if you type 'bac', words like 'bacteria' come up. There was one answer.