英语翻译DescriptionBessie's been appointed the new watch-cow for

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英语翻译
Description
Bessie's been appointed the new watch-cow for the farm.Every night,it's her job to walk across the farm and make sure that no evildoers are doing any evil.She begins at the barn,makes her patrol,and then returns to the barn when she's done.
If she were a more observant cow,she might be able to just walk each of M (1

描述
贝西的被任命为新的警惕农场牛.每天晚上,这已经是她工作走过了农场,以确保没有尽职尽责,在做任何邪恶.她开始在马厩,使她的巡逻,然后当她做了谷仓的回报.
如果她是一个留心的牛,她可能才刚刚走各的M（1“= M”= 50,000）双向路线编号1 ..M了N（2“= ñ”= 10,000）领域的编号为1 ..安理会关于农场一次,有信心,她也目睹了一切,她需要看到的.但是,由于她没有,她要确保她走在每条路线完全两次.这也是重要的是,她的两个沿每条路线行程将在相反的方向,这样她不会错过两次同样的事情.
一双的领域可能会连接一个以上的线索.寻找路径贝西可以按照这些产品将满足她的要求.这样的路径是保证存在.
输入
*第1行：两个整数,N和米
*行2 ..m +1个：两个整数表示一个由路径连接的领域对.
输出
*线路1 ..200万1：她的领域经过列表,每行,开始和结束与外地一马厩.如果有一个以上的解决方案是可能的,输出任何解决方案.

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