勇敢的炮灰

摘要： 点击打开链接487-3279Time Limit:2000MSMemory Limit:65536KTotal Submissions:220260Accepted:38393DescriptionBusinesses like to have memorable telephone numbers. One way to make a telephone number memorable is to have it spell a memorable word or phrase. For example, you can call the University of Waterloo by 阅读全文

摘要： 点击打开链接Is It A Tree?Time Limit:1000MSMemory Limit:10000KTotal Submissions:18904Accepted:6448DescriptionA tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between nodes satisfying the following properties.There 阅读全文

摘要： 点击打开链接Drainage DitchesTime Limit:1000MSMemory Limit:10000KTotal Submissions:49648Accepted:18829DescriptionEvery time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to re 阅读全文

摘要： 点击打开链接Power NetworkTime Limit:2000MSMemory Limit:32768KTotal Submissions:20903Accepted:10960DescriptionA power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produce an amoun 阅读全文