"One Was Johnny," "Chicken Soup with Rice" and "Pierre."

VOA: special.2009.10.05

You could say, I could have zero chickens and 20 pigs, does that work? I've got one chicken and nineteen pigs, does that work?

为什么简单列举出所有可能的情况,再一个来检验？你可能会说,我可以有0只鸡和20只猪，这能行吗？

麻省理工公开课 - 计算机科学及编程导论课程节选