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View Compilation Error

0_0_26880427_14956.cpp:15:18: error: expected type-specifier before '(' token
     bool operator(const state& s) {
                  ^
0_0_26880427_14956.cpp: In function 'int bfs(char, char, char, char)':
0_0_26880427_14956.cpp:33:28: error: 'class std::priority_queue<state>' has no member named 'front'
         const state& s = q.front();
                            ^
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h: In instantiation of 'bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = state]':
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/predefined_ops.h:141:37:   required from 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = __gnu_cxx::__normal_iterator<state*, std::vector<state, std::allocator<state> > >; _Value = state; _Compare = std::less<state>]'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_heap.h:129:76:   required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<state*, std::vector<state, std::allocator<state> > >; _Distance = long long int; _Tp = state; _Compare = __gnu_cxx::__ops::_Iter_comp_val<std::less<state> >]'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_heap.h:201:51:   required from 'void std::push_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<state*, std::vector<state, std::allocator<state> > >; _Compare = std::less<state>]'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_queue.h:510:41:   required from 'void std::priority_queue<_Tp, _Sequence, _Compare>::push(std::priority_queue<_Tp, _Sequence, _Compare>::value_type&&) [with _Tp = state; _Sequence = std::vector<state, std::allocator<state> >; _Compare = std::less<state>; std::priority_queue<_Tp, _Sequence, _Compare>::value_type = state]'
0_0_26880427_14956.cpp:28:41:   required from here
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: error: no match for 'operator<' (operand types are 'const state' and 'const state')
       { return __x < __y; }
                    ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:220:5: note: template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:220:5: note:   template argument deduction/substitution failed:
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: note:   'const state' is not derived from 'const std::pair<_T1, _T2>'
       { return __x < __y; }
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:298:5: note: template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator<(const reverse_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:298:5: note:   template argument deduction/substitution failed:
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: note:   'const state' is not derived from 'const std::reverse_iterator<_Iterator>'
       { return __x < __y; }
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:348:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator<(const reverse_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:348:5: note:   template argument deduction/substitution failed:
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: note:   'const state' is not derived from 'const std::reverse_iterator<_Iterator>'
       { return __x < __y; }
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1072:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator<(const move_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1072:5: note:   template argument deduction/substitution failed:
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26880427_14956.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:371:20: note:   'const state' is not derived from 'const std::


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