5/21-5/27 CareerCup 6.3

You have a five quart jug and a three quart jug, and an unlimited supply of water (but no measuring cups). How would you come up with exactly four quarts of water?
NOTE: The jugs are oddly shaped, such that filling up exactly ‘half’ of the jug would be impossible.

https://github.com/writecoffee/career_cup_iteration/blob/master/6.3.cpp
my pdf is as follows
https://docs.google.com/open?id=0B4FbLD4DZ4zFeVUyaXFyZlRsRFE

2楼好专业阿 Orz