Zillow Software Development Engineer interview questions

I applied for Zillow on its website and received an test including two algorithms problems without time limit. Got phone interview but did not pass it. I solved the the problems and follow-up. Don’t know what’s wrong

Applied online via their website. Was contacted shortly after and asked to complete 2 coding challenges. They were the same other people mentioned here. Convert a string to a long and implement insert and delete on a trinary tree. I have near 10 years of experience and know quite well how to do things such as this. Still, I took my time and spent about 4 hours making sure all of the code was write. I wrote plenty of unit tests to ensure it would all work and added comments all over as to be sure my intent in the code. After making sure the code was working perfectly, I submitted it to the HR person. A few days later and I find out that they decided to pass on me due to my answers to the coding challenges. I'm not quite sure what it is Zillow is looking for exactly. It boggles my my mind that they would pass on me this early on without even speaking to me any further or asking for more challenging puzzles to solve. The hiring process here is some of the worst I have seen. It would be nice to have a little feedback about what it is exactly they are looking for. I wanna agree with the other reviewer on here that more than likely they are using some kind of random guess or lottery pick to choose who gets to move on or not. I was not pleased with how this all turned out. In light of that, I do not recommend at all!