摘要：
Description A network administrator manages a large network. The network consists of N computers and M links between pairs of computers. Any pair of c 阅读全文
摘要：
Description The system of Martians' blood relations is confusing enough. Actually, Martians bud when they want and where they want. They gather togeth 阅读全文
摘要：
Description Windy has N balls of distinct weights from 1 unit to N units. Now he tries to label them with 1 to N in such a way that: No two balls shar 阅读全文