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no one can help me？

In the c++ program language, when you compare the sign int with the unsigned int ,the compiler will convert the "sign int " to "unsigned int". so the negative integer will be converted to nonegative,...

if you want to get a class's member , you can declare a static variable.

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what's the mean about the relation "S >= dt >= … >= d2 >= d1 >= 0"? how can get the "dj"?

what's the mean about the relation "S >= dt >= … >= d2 >= d1 >= 0"? how can get the "dj"?