Neeva Software Engineer interview questions

First comes an introduction 5 min, then start coding session to solve a leetcode problem for about 40-50 min. After finishing the coding, they asked how to optimize the algorithm. Finally is a Q&A for 5 min

The interview process was ok, the recruiter call went well but they rejected me after the technical screen even though I solved the problem and answered the questions. I sent an email asking why but the answer was not specific.