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0_0_27468217_21789.cpp
0_0_27468217_21789.cpp(15) : error C2668: “abs”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1145): 可能是“long double abs(long double) throw()”
        VC2013\INCLUDE\math.h(1029): 或       “float abs(float) throw()”
        VC2013\INCLUDE\math.h(1025): 或       “double abs(double) throw()”
        VC2013\INCLUDE\math.h(470): 或       “int abs(int)”
        尝试匹配参数列表“(__int64)”时