First it was a DSA OA , they asked 3 medium level leetcode problems , it was open only for circuital branches in my college . I solved 2 problems completely , I was shortlisted for interview . There was a Single round . They asked me about my projects from my resume , then they asked a math problem like :- " you have a random number generator which generates number (there was no range given for the numbers we can generate), and you can use the generator as many times you want , and you are supposed to find value of pi " . I tried but couldn't get it , and I was rejected . Maybe it was bad luck , because other interviewers asked DSA to other guys , but for me there was no DSA .