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4582: [Usaco2016 Open]Diamond Collector Description Bessie the cow, always a fan of shiny objects, has taken up a hobby of mining diamonds in her spar 阅读全文
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1584: [Usaco2009 Mar]Cleaning Up 打扫卫生 Description 有N头奶牛,每头那牛都有一个标号Pi,1 <= Pi <= M <= N <= 40000。现在Farmer John要把这些奶牛分成若干段,定义每段的不河蟹度为:若这段里有k个不同的数,那不河蟹度为 阅读全文