I was contacted via LinkedIn. After providing an updated resume, I was asked to take an hour-long test on HackerRank.

After the test, I was invited to an onsite interview on a Saturday. There seemed to be around 22 candidates and about 6 interviewers present that day.

The first round was a technical one, and it went well. After waiting for more than three hours, I was told that the first round had been positive and that I would have to come in again on a weekday for further rounds.

Three days later, they called to schedule another technical interview, to be conducted via Skype two days later. A day before the interview, I received an email stating that they would not be proceeding with my candidacy.

Basically, the HR there doesn't seem to care about anyone else's time.

A form of the knapsack problem.

Another question on binary trees.