Amazon Software Development Engineer (SDE I) interview questions

The first round is QA. There are medium level dsa question. In the second round, it was a face-to-face interview, and they asked me 2 medium-level questions. It clear this round easily In third round, they again give me one dsa question on graph. But i am not able to solved it on time

First starts with coding assessment then recruiters call then initial hiring coding round.in coding round , there were two leetcode questions , which are medium to hard and next was the loop In which there is a combination of leetcode and architecture, system design