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0_0_4686352_10017.cpp
0_0_4686352_10017.cpp(15) : error C2666: “pow” : 7 个重载有相似的转换
        VC\include\math.h(620): 可能是“long double pow(long double,int)”
        VC\include\math.h(618): 或       “long double pow(long double,long double)”
        VC\include\math.h(572): 或       “float pow(float,int)”
        VC\include\math.h(570): 或       “float pow(float,float)”
        VC\include\math.h(534): 或       “double pow(int,int)”
        VC\include\math.h(532): 或       “double pow(double,int)”
        VC\include\math.h(195): 或       “double pow(double,double)”
        试图匹配参数列表“(float, double)”时