Amazon Software Developer interview questions

got an email from an amazon recruter, about an phone interview and a programming assignment.the asignment needs to be finished and submitted before the interview. The phone interview was not very diffcult but lots of them were about data structure and algorithms. I felt I answered them ok. Amazon didn't update me about the status until a month later.

I had three phone rounds of coding questions. Medium toughness. Checked basic algorithms and data structures. First two rounds, I read out the code I wrote on paper. Last round was on line coding. Four interviews on site one after another. Coding on white board.