Less is more

When in school, I tended to pass in less sheets of exam paper than my classmates, yet manage to score higher. (*brag brag* :P )

Now seeing some of my colleagues / juniors come up with convoluted solutions for something that can be done in much fewer lines, I finally realize what my classmates must have been writing down on so many sheets of paper... 

Back then, of course I did not see their answer sheet... But I did wonder what they were writing :P