MicroStrategy Quality Engineer interview questions

ask to introduce myself, why microstrategy, something you want to improve in next 5years, your weakness, hobby. finally a IQ question. there is a river, 3 good guys and 3 bad guys are all on one side of the river, one boat, all the people need to go through the river. the boat can only hold two people once. the requirement is the number of good guys cannot be less than the bad guy, no matter on which side of the river or on the boat, if so, the bad guys will eat good guys. didn't figure this out during the interview. SAD then the hr gave me another very easy one to comfort me. three switches and three lights. how do you know which one controls which