Synopsys Technical Intern interview questions

Had to go through a 3 stage interview process for an intern position. first round : Was more on what I knew about digital design, few questions on adder/subtractor were thrown. Couple of questions on latches and flops. Detailed operation of transistor, with curves and v/i equations. second round: was more on layout , was asked to draw layout of a mosfet, I was very comfortable here thanks to the interviewer, it was more like a discussion. fairly easy. third round: I was asked on logical reason (kind of strange), then was asked to write a algorithm to draw a rectangle , then using this logic I was asked to draw layouts with varied shapes. This was fun, the interviewer more looking towards my approach than the correctness. Finally , had an interview with HR , where I was told more on the internship details, policies etc.