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先来看这道题: USACO 2011 Open Gold Mowing the Lawn 修剪草坪 After winning the annual town competition for best lawn a year ago, Farmer John has grown lazy; he h 阅读全文
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LIFTOVI Solitaire has N elevators. Each elevator are connecting exactly two floors and it does not stop on thefloors between that two floors. The spee 阅读全文
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Problem 1: Guard Mark [Bill Cooperman, 2014]Farmer John and his herd are playing frisbee. Bessie throws thefrisbee down the field, but it's going stra 阅读全文