Got a maths problem and was judged more on how I can use correct formula, rather understanding the problem solving ability. Interviewer was looking for exact answers I think.

HR contacted me over linkedin, she scheduled a zoom call. I asked her to schedule the next technical round at her convince and said that I would make myself available. She scheduled it after a week. She sent an email that first round was cleared. Again, I was okay to schedule at her preferred time. She scheduled it after 15 days. I solved most of the problems in codesignal meanwhile. It was cancelled at the last minute. Again she scheduled a slot after 15 more days. It was cancelled again. I had got another offer by that time. My last working day at current organization was nearby. I requested her if we can move the process faster. This time she scheduled the interview within a week. The interview went well. I could solve it in the most efficient way. Interviewer appreciated and he also asked if two rounds were pending or only one round. After a week, I sent an email to HR asking if there is any positive feedback, my last day working day was very nearby. I got no response for the same. I sent another email after 4 days asking for the feedback of second round. She said she will collect the feedback and respond to me. She took a day and responded that other candidates performed better than me. It was a total disappointment for not knowing the valid reason for rejection.