Netcore Backend Developer interview questions

I got shortlisted for the interview after participating in a HackerEarth hiring challenge. The challenge consisted of two elimination rounds, testing DSA problem-solving skills. In the first round, focused on arrays and strings, I solved both questions but failed four test cases, still securing a shortlist. The second round was tougher, with questions on graphs and Dijkstra's algorithm. I fully solved one question and partially solved the other, passing only two test cases. After 15 days, a recruiter contacted me to schedule a virtual interview with a Senior SDE. I asked for two days to prepare. During the interview, the interviewer revisited a problem I had solved in Round 1 (perfect string for given strings s and t), asking me to explain my approach. Then, I was tasked with solving the "Buy and Sell Stock" problem. After explaining my solutions, the interview concluded, though it felt like the interviewer was not impressed.

Overall process was good there were 3 rounds cleared all the rounds difficulty level was easy to medium got a chance to interview the company CTO in the final round but still did not get the offer and I was rejected when the results came after 11 days