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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

It was hard and hectic. It was not embarrassing, but I felt like it was. The process was simple, not too different from other companies. I didn't prepare much, but it would have been hard even if I had studied.

There were 3 DSA rounds scheduled, with the last 15 minutes of each round being reserved for Googliness or culture fit questions. The DSA questions were easily solvable if the candidate possessed some experience in competitive programming.