古希腊有个国王,想把一批囚徒处死。当时流行的处死方法有两种:一种是砍头,一种是处绞刑。那么,怎样处死这批囚徒?国王忽然升起了一个奇怪的念头:决定让囚徒自己去挑选一种。挑选的方法是这样的:囚徒可以任意说出一句话来,而且这句话是马上可以验证其真假的。如果囚徒说的是真话,那么就处绞刑;如 There was a king in ancient Greece who wanted to put a group of prisoners to death. There were two methods of execution that were popular at the time: one was beheading and one was hanged. Then, how did you execute the prisoners? The king suddenly raised a strange idea: he decided to let the prisoners choose one. The method of selection is this: Prisoners can utter a sentence arbitrarily, and this sentence can immediately verify its true and false. If the prisoner says the truth, hang the punishment;