Zillow Software Development Engineer interview questions

The first call with a recruiter was followed immediately by their standard take-home coding exercises: insert/delete from a ternary tree (which they call a tri-nary tree) and converting a string into a long. Straightforward questions. I decided to include not only a solution but also unit tests, and in such a way that I would expect to pass a code review for check-in. This isn't my first dev job. While the code functioned, and as far as I know was production-quality, I received an email about one day after I submitted the response that they were not going to ask me in for a screening. Disappointing, as I have no idea what they were looking for that I didn't do. I heard this complaint from other reviewers, but I assumed that they just solved the problem the fastest way -- I thought for sure having tests, comment blocks, and code structured for use in an application would impress enough for an interview.

Applied through Glassdoor, and have got the response pretty quickly got a coding challenge with two questions which were discussed earlier -> Convert String to Long without using library functions in any programming language -> Implement insert and delete in ternary search tree ternary search tree - Same as binary search tree but does have one more node under the parent node with same value example -> node 5 has 4 on the left and 6 on the right and has 5 right below it. Three nodes to each node. the recruiter has sent me an email saying clearly :- Do it at your own time, As i had other interviews lined up for the week I have done it exactly in one week. I have got the answers right and checked every possible way and test cases. But the main reason to decline in my case i think was the time taken to submit the coding challenge. It exactly took me one day to finish the coding challenge. but i cannot explain it so the rejection.