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View Compilation Error

0_0_34833845_19333.cpp:27:56: error: wrong number of template arguments (0, should be 1)
     using Heap = __gnu_pbds::priority_queue<Edge, less<>, pairing_heap_tag> ;
                                                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:48:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_34833845_19333.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:367:12: error: provided for 'template<class _Tp> struct std::less'
     struct less : public binary_function<_Tp, _Tp, bool>
            ^
0_0_34833845_19333.cpp:27:75: error: template argument 2 is invalid
     using Heap = __gnu_pbds::priority_queue<Edge, less<>, pairing_heap_tag> ;
                                                                           ^
0_0_34833845_19333.cpp:28:14: error: 'Heap' has not been declared
     typename Heap::point_iterator id[MAXN];
              ^
0_0_34833845_19333.cpp:29:5: error: 'Heap' does not name a type
     Heap que ;
     ^
0_0_34833845_19333.cpp: In member function 'bool DinicEx<T>::dijkstra(int, int)':
0_0_34833845_19333.cpp:36:9: error: 'que' was not declared in this scope
         que.clear() ;
         ^
0_0_34833845_19333.cpp: In instantiation of 'bool DinicEx<T>::dijkstra(int, int) [with T = int]':
0_0_34833845_19333.cpp:63:28:   required from 'void DinicEx<T>::dinic(int, int, int&, T&) [with T = int]'
0_0_34833845_19333.cpp:120:28:   required from here
0_0_34833845_19333.cpp:33:48: error: cannot convert 'std::nullptr_t' to 'int' in assignment
             dis[i] = INF ;last[i] = -1 ; id[i] = nullptr ;
                                                ^


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