摘要：
C. Dancing Lessonstime limit per test5 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere arenpeople taking dancing lessons. Every person is characterized by his/her dancing skillai. At the beginning of the lesson they line up from left to right. While there is at 阅读全文
摘要：
D. Event Datestime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputOn a history lesson the teacher asked Vasya to name the dates whennfamous events took place. He doesn't remembers the exact dates but he remembers a segment of days[li, ri](inclusi 阅读全文
摘要：
食物链Time Limit:1000MSMemory Limit:10000KTotal Submissions:33156Accepted:9626Description动物王国中有三类动物A,B,C，这三类动物的食物链构成了有趣的环形。A吃B， B吃C，C吃A。现有N个动物，以1－N编号。每个动物都是A,B,C中的一种，但是我们并不知道它到底是哪一种。有人用两种说法对这N个动物所构成的食物链关系进行描述：第一种说法是"1 X Y"，表示X和Y是同类。第二种说法是"2 X Y"，表示X吃Y。此人对N个动物，用上述两种说法，一句接一句地说出K句话，这K句 阅读全文