问题的提出:四位分别来自中国、美国、俄罗斯、加拿大的小学生都以自己的国土面积大而骄傲不已，

但是他们想知道到底谁的国土最大，谁的最小，他们的判断如下：

加拿大学生：加拿大最大，美国最小，俄罗斯第三。

美国学生：美国最大，加拿大最小，俄罗斯第二，中国第三。

中国学生：美国最小，加拿大第三。

他们互不相让，最后老师下定结论：对于上述四国面积的判断，他们每人只判断对了一个国家。对于

老师的提示，四位小学生还是绞尽脑汁推断不出到底是谁的国土最大，谁的最小！现请编制程序告诉

四位小学生正确顺序。-Of the problem: four from China, the United States, Russia, Canada, students have their own proud land of endless large area,

But in the end they want to know who s land the biggest, who s the smallest, they determine the following:

Canadian students: Canada s largest, the smallest U.S., Russia third.

American students: the largest U.S., Canada, the minimum, Russia s second, the third.

Chinese students: the United States the minimum, Canada s third.

They refused to give the teachers make up the final conclusion: the area for the four countries to judge, each of them only on a national judge. For

Teacher tips, or the brains of four students who concluded the land not in the end the most, who s the smallest! Please inform the preparation of procedures are

Four students in the correct order.