Amazon SDE-1 interview questions

It was really helpful and quite knowledgeable interviewing with an Amazonian. He did not ask for any coding but simply the approach to the question. He was mainly focussing on my logical thinking.

what are pointers in java, what is the difference in python and java, what is supervised vs unsupervised learning, what is regression vs logistic regression, what is selection bias, what is variance, what is over-fitting vs under-fitting, what is bias variance trade off. what is concurrency in java, what is multi threading in java, how to avoid race conditions in threads,