View Compilation Error

0_0_8203626_2242.cpp
0_0_8203626_2242.cpp(26) : error C2668: “abs” : 对重载函数的调用不明确
        VC\include\math.h(584): 可能是“long double abs(long double)”
        VC\include\math.h(536): 或       “float abs(float)”
        VC\include\math.h(530): 或       “double abs(double)”
        VC\include\math.h(528): 或       “long abs(long)”
        VC\include\stdlib.h(265): 或       “int abs(int)”
        试图匹配参数列表“(std::_Tree<_Traits>::size_type)”时
        with
        [
            _Traits=std::_Tmap_traits<int,int,std::less<int>,std::allocator<std::pair<const int,int>>,false>
        ]