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A word on cover letters: they aren’t required (and may or may not be considered), so it’s your call on whether to include one. If you do decide to include a cover letter, many of the same suggestions we have for building a good resume apply here as

The interview was taken after the online coding round. It proceeded as follows: first technical interview, then a second technical round, and finally a managerial round. The difficulty level of the first round was moderate, and the second round was

One coding question regarding Trees was not very clear to me. I should have clarified the question before going for the solution. This was the first DSA round. Before that, I had a telephonic conversation with HR.