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View Compilation Error

0_0_15198953_30992.cpp
0_0_15198953_30992.cpp(50) : error C2664: “void qsort(void *,size_t,size_t,int (__cdecl *)(const void *,const void *))”: 无法将参数 4 从“int (__cdecl *)(const A *,const A *)”转换为“int (__cdecl *)(const void *,const void *)”
        在匹配目标类型的范围内没有具有该名称的函数
0_0_15198953_30992.cpp(64) : error C2668: “sqrt”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1251): 可能是“long double sqrt(long double) throw()”
        VC2013\INCLUDE\math.h(1135): 或       “float sqrt(float) throw()”
        VC2013\INCLUDE\math.h(521): 或       “double sqrt(double)”
        尝试匹配参数列表“(int)”时


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