摘要：
http://poj.org/problem?id=2762Going from u to v or from v to u?Time Limit:2000MSMemory Limit:65536KTotal Submissions:12733Accepted:3286DescriptionIn order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors connecting some rooms. Each time, 阅读全文
