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Time Limit: 2sec Memory Limit:32MBDescriptionThe young and very promising cryptographer Odd Even has implemented the security module of a large syste... 阅读全文
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DescriptionThe sequence of n ? 1 consecutive composite numbers (positive integers that are not prime and not equal to 1) lying between two successive ... 阅读全文
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DescriptionA checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum... 阅读全文
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DescriptionAmtel has announced that it will release a 128-bit computer chip by 2010, a 256-bit computer by 2020, and so on, continuing its strategy of... 阅读全文