On-Campus Interview -> HackerRank -> Onsite

I thought I did very well on the on-site, but received a rejection letter two weeks after and don't know why. It seems that Indeed has relatively easy interviews, but landing an offer could be very difficult.

Here is a summary of my performance during the on-site interview:

• Onsite HackerRank Programming Challenge (1.5 hr): Perfect solution in Python, passed 12/12 test cases.
• Whiteboard 1 (1 hr): Provided a sub-optimal solution with C++ code; optimal solution without code (due to time constraint).
• Whiteboard 2 (1 hr): Provided a perfect solution with C++ code.
• Whiteboard 3 (1 hr): Provided a suboptimal solution with C++ code and an optimal solution with C++ code after some hints.

Hopefully, this will be helpful as a rough benchmark. Congratulations to whoever landed an offer at Indeed.

Basic data structures, including graphs. (Exact question not disclosed due to NDA)