摘要： 漏掉了，先补下AB 阅读全文

摘要： B. Sereja and Stairstime limit per test 1 secondSereja loves integer sequences very much. He especially likes stairs.Sequence a1, a2, ..., a|a| (|a| is the length of the sequence) is stairs if there is such index i (1 ≤ i ≤ |a|), that the following condition is met:a1 ai + 1 > ... > a|a| - 1 & 阅读全文

摘要： A. Sereja and Dimatime limit per test 1 secondmemory limit per test 256 megabytesSereja and Dima play a game. The rules of the game are very simple. The players have n cards in a row. Each card contains a number, all numbers on the cards are distinct. The players take turns, Sereja moves first. Duri 阅读全文