I applied through college or university. The process took 5 weeks.

Interview process was long and lengthy. First round was OA, which was containing questions of trees and graphs, then came the learnathon part A, which was having the question tree space and then the part B which lasted more than 10 hours, it was majorly focusing on optimization of my code which I wrote in part A and introduction of multi-threading, the last round was sort of managerial round where he grilled me on my resume.

I need an optimization of my code (part A).