摘要：
DescriptionA network of m roads connects N cities (numbered from 1 to N). There may be more than one road connecting one city with another. Some of th... 阅读全文
摘要：
Problem DescriptionJack likes to travel around the world, but he doesn’t like to wait. Now, he is traveling in the Undirected Kingdom. There are n cit... 阅读全文