SAP Internship interview questions

It was on campus interview, Before first round we had an online assessment in which it had 2 coding questions (1 medium, 1 hard). After assessment 60 members were shortlisted. In first round it was all about Your Introduction, Projects, OOPs concepts in depth and a Linkedlist question based on finding the intersection and a stack parenthesis checker. Round 2 was 50 minutes again introduction, projects, OOPs concepts and here they told to write code on abstraction using interface and then Linkedlist palindrome question.