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Time limit per test: 2.0 seconds Memory limit: 256 megabytes oxx 和 xjj 终于上了船，船上的时光总是如此漫长，因此 oxx 决定与 xjj 一同玩一个无聊的游戏。 游戏规则很简单，首先由 xjj 随机画一棵树，随后两人轮流从树中选取一个度数不为 0 的结点 (度数为 0 则不与任何边相连) 将其与其相连的边删去，谁最终无法删...

time limit per test : 1 second memory limit per test : 256 megabytes As we all know, Max is the best video game player among her friends. Her friends were so jealous of hers, that they created an actu...

time limit per test : 4.0 s memory limit per test : 1024 MB Every time when Rikka faces to a great nature sight, she will recall a line of ants moving in a hurry. Rikka loves ants and keeps two large ...