摘要：
Description Byteotia城市有n个 towns m条双向roads. 每条 road 连接 两个不同的 towns ,没有重复的road. 所有towns连通。 Byteotia城市有n个 towns m条双向roads. 每条 road 连接 两个不同的 towns ,没有重复的r 阅读全文
摘要：
It's almost summer time, and that means that it's almost summer construction time! This year, the good people who are in charge of the roads on the tr 阅读全文