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Play on Words Some of the secret doors contain a very interesting word puzzle. The team of archaeologists has to solve it to open that doors. Because 阅读全文
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Problem Description We have learned how to obtain the value of a polynomial when we were a middle school student. If f(x) is a polynomial of degree n, 阅读全文
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Description You are a member of the space station engineering team, and are assigned a task in the construction process of the station. You are expect 阅读全文
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Island Transport Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among th 阅读全文