Optimus Information Software Engineer interview questions

They called all the registered students to the Noida office. There was a OA round for all 100 students and it had 20 aptitude questions and 2 DSA questions. The OA experience was very bad as my OA submission got an error from their side and I had to give OA again. They shortlisted students based on just DSA and wasted our time on Aptitude. Dsa questions were from Binary Search and Strings.