Amazon Software Development Engineer interview questions

About you. DIrectly onto questions: Shuffle a pack of cards BFS Intersection of arrays

After two phone interview both lasting approximately 45 minutes, I was invited for an on-site interview at Amazon's Seattle office. Airfare and Hotel were prepaid. Other incidental expenses will be refunded after receipts are submitted. There were total of six interviews including one with HR Personnel and one with hiring manager. Remaining four interviews were purely technical with some behavioral components to them. Interview with hiring manger was purely behavioral and the one with HR personnel was purely regarding immigration, work-permit and benefits. I thought the interviews went well, but it seems they were not satisfied. Overall I think the interview process was fair.