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Xiangqi is one of the most popular two-player board games in China. The game represents a battle between two armies with the goal of capturing the ene 阅读全文
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You have devised a new encryption technique which encodes a message by inserting between its characters randomly generated strings in a clever way. Be 阅读全文
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DNA (Deoxyribonucleic Acid) is the molecule which contains the genetic instructions. It consists of four different nucleotides, namely Adenine, Thymin 阅读全文
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A children's puzzle that was popular 30 years ago consisted of a 5 5 frame which contained 24 small squares of equal size. A unique letter of the alph 阅读全文
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After the big earthquake, a lot of roads have been destroyed, some towns are disconnected with each other. In order to save the trapped as soon as pos 阅读全文