摘要：Problem Statement Given is a sequence A of N integers. There are 2N−1 non-empty subsequences B of A. Find the sum of max(B)×min(B) over all of them. S 阅读全文

摘要：Problem Statement Snuke has decided to play a game using cards. He has a deck consisting of NN cards. On the ii -th card from the top, an integer AiAi 阅读全文

摘要：Problem Statement There is a cave consisting of NN rooms and MM one-directional passages. The rooms are numbered 11 through NN . Takahashi is now in R 阅读全文

摘要：Problem Statement Takahashi will take part in an eating contest. Teams of NN members will compete in this contest, and Takahashi's team consists of NN 阅读全文