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Description You have devised a new encryption technique which encodes a message by inserting between its characters randomly generated strings in a cl 阅读全文
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Description While skimming his phone directory in 1982, Albert Wilansky, a mathematician of Lehigh University,noticed that the telephone number of his 阅读全文
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Description Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point N (0 ≤ N ≤ 100,00 阅读全文
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Description You are in a plane and you are about to be dropped with a parasuit in a crystal maze. As the name suggests, the maze is full of crystals. 阅读全文
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Description Winter is approaching! The weather is getting colder and days are becoming shorter. The animals take different measures to adjust themselv 阅读全文