我找到了问题的全文 最后的注释 楼主没有给出
注释大概是说:你不能和坏人说话,坏人们很愿意冒着被杀的危险去抓到你,他们知道你是个英雄但还是追来了.他们大概知道你有多少只箭.
问题全文如下
PUZZLE
You are a hero with a broken sword (Conan, Boromir, or your favorite Dungeons and Dragons character) being chased by a troop of bad guys (bandits, orcs, . . .). Fortunately you are on a horse and they are not. Unfortunately your horse is tired and they will eventually run you down. Fortunately you have a bow. Unfortunately you have only ten arrows. Fortunately, being a hero, you never miss. Unfortunately there are 40 bad guys. The bad guys are strung out behind you, as shown.
Problem: Use economics to get away.
Note: You cannot talk to the bad guys. They are willing to take a substantial chance of being killed in order to get you--after all, they know you are a hero and are still coming. They know approximately how many arrows you have.