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View Compilation Error

0_0_36576951_5893.cpp:5:71: error: wrong number of template arguments (0, should be 1)
 template<typename T> using Heap = priority_queue<T, vector<T>, greater<>>;
                                                                       ^
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_36576951_5893.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:358:12: error: provided for 'template<class _Tp> struct std::greater'
     struct greater : public binary_function<_Tp, _Tp, bool>
            ^
0_0_36576951_5893.cpp:5:72: error: template argument 3 is invalid
 template<typename T> using Heap = priority_queue<T, vector<T>, greater<>>;
                                                                        ^
0_0_36576951_5893.cpp: In function 'll prim()':
0_0_36576951_5893.cpp:23:5: error: 'Heap' was not declared in this scope
     Heap<pair<ll, int>> heap[2];
     ^
0_0_36576951_5893.cpp:23:22: error: expected primary-expression before '>' token
     Heap<pair<ll, int>> heap[2];
                      ^
0_0_36576951_5893.cpp:23:25: error: 'heap' was not declared in this scope
     Heap<pair<ll, int>> heap[2];
                         ^


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