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

I've got two chickens and eighteen pigs, you get the idea.

我有1只鸡和19只猪，这能行吗？,我有2只鸡和18只猪。

麻省理工公开课 - 计算机科学及编程导论课程节选

I'm simply saying swap X with Y, but this 2 won't work, because where are X and Y defined?

我只简单地说交换X和Y，但是这两行不起作用，因为X和Y是在哪里定义的呢？

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