摘要：
Purifying MachineTime Limit: 2000MSMemory Limit: 65536KTotal Submissions: 4014Accepted: 1127DescriptionMike is the owner of a cheese factory. He has 2N cheeses and each cheese is given a binary number from 00...0 to 11...1. To keep his cheese free from viruses, he made himself a purifying machine to 阅读全文
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KindergartenTime Limit: 2000MSMemory Limit: 65536KTotal Submissions: 4787Accepted: 2326DescriptionIn a kindergarten, there are a lot of kids. All girls of the kids know each other and all boys also know each other. In addition to that, some girls and boys know each other. Now the teachers want to pi 阅读全文
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Girls and BoysTime Limit: 5000MSMemory Limit: 10000KTotal Submissions: 10008Accepted: 4427DescriptionIn the second year of the university somebody started a study on the romantic relations between the students. The relation "romantically involved" is defined between one girl and one boy. F 阅读全文
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The Perfect StallTime Limit: 1000MSMemory Limit: 10000KTotal Submissions: 17246Accepted: 7872DescriptionFarmer John completed his new barn just last week, complete with all the latest milking technology. Unfortunately, due to engineering problems, all the stalls in the new barn are different. For th 阅读全文