My 2011 World Finals Solutions

Note: All of these solutions pass the World Finals data in what I consider a reasonable amount of time (30 seconds or fewer). I have denoted the problems that get TLE in Live Archive with ^.

Problem A: To Add or to Multiply
Problem C: Ancient Messages
Problem E: Coffee Central^
Problem F: Machine Works
Problem G: Magic Sticks
Problem H: Mining Your Own Business
Problem J: Pyramids
Problem K: Trash Removal