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View Compilation Error

0_0_11635877_31215.cpp
VC\include\functional(139) : warning C4800: “int” : 将值强制为布尔值“true”或“false”(性能警告)
        VC\include\functional(138) : 编译类模板成员函数“bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const”时
        with
        [
            _Ty=std::vector<node>::value_type
        ]
        VC\include\queue(211) : 参见对正在编译的类模板实例化“std::less<_Ty>”的引用
        with
        [
            _Ty=std::vector<node>::value_type
        ]
        0_0_11635877_31215.cpp(46) : 参见对正在编译的类模板实例化“std::priority_queue<_Ty>”的引用
        with
        [
            _Ty=node
        ]
0_0_11635877_31215.cpp(22) : error C4716: “node::operator<” : 必须返回一个值


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