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Power of CryptographyDescriptionCurrent work in cryptography involves (among other things) large prime numbers and computing powers of numbers among t... 阅读全文
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Greatest NumberDescriptionSaya likes math, because she think math can make her cleverer.One day, Kudo invited a very simple game:Given N integers, the... 阅读全文
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Pixel density题目描述Pixels per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts; typically computer displays... 阅读全文
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Radar InstallationDescriptionAssume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is... 阅读全文
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Alice and BobDescriptionAlice and Bob like playing games very much.Today, they introduce a new game.There is a polynomial like this: (a0*x^(2^0)+1) * ... 阅读全文
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Immediate DecodabilityAn encoding of a set of symbols is said to beimmediatelydecodable if no code for one symbol is the prefix of a code for another ... 阅读全文