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1_277_3636_25586.cpp
1_277_3636_25586.cpp(39) : error C2668: “pow” : 对重载函数的调用不明确
        VC\include\math.h(532): 可能是“double pow(double,int)”
        VC\include\math.h(195): 或       “double pow(double,double)”
        试图匹配参数列表“(double, size_t)”时