Amazon Internship interview questions

Round 1: The first round consists of 20 mcqs and 2 coding questions. The MCQ’s are focused mainly on Operating systems, data structures and algorithm analysis and DBMS. There is negative marking for mcqs. 1)count triplets with sum smaller that a given value. 2) based on balancing brackets in string (don't remember exactly)

There were two online assessments. I passed the first one. Then had to do the next one within a week. Passed the second and was asked to do a phone interview afterward.