摘要：
Drainage DitchesTime Limit:1000MSMemory Limit:10000KTotal Submissions:59210Accepted:22737DescriptionEvery time it rains on Farmer John's fields, a pon... 阅读全文
摘要：
Power NetworkTime Limit:2000MSMemory Limit:32768KTotal Submissions:24019Accepted:12540DescriptionA power network consists of nodes (power stations, co... 阅读全文