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View Compilation Error

0_0_21504404_23623.cpp: In function 'int main()':
0_0_21504404_23623.cpp:60:26: error: no match for 'operator==' (operand types are 'node' and 'node')
             if(i>=1&&b[i]==b[i-1]){
                          ^
0_0_21504404_23623.cpp:60:26: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/list:63:0,
                 from 0_0_21504404_23623.cpp:14:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_list.h:1729:5: note: template<class _Tp, class _Alloc> bool std::operator==(const std::list<_Tp, _Alloc>&, const std::list<_Tp, _Alloc>&)
     operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_list.h:1729:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::list<_Tp, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/list:63:0,
                 from 0_0_21504404_23623.cpp:14:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_list.h:285:5: note: template<class _Val> bool std::operator==(const std::_List_iterator<_Tp>&, const std::_List_const_iterator<_Val>&)
     operator==(const _List_iterator<_Val>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_list.h:285:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::_List_iterator<_Tp>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from 0_0_21504404_23623.cpp:11:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:246:5: note: template<class _Tp, class _Seq> bool std::operator==(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)
     operator==(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:246:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::stack<_Tp, _Seq>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:64:0,
                 from 0_0_21504404_23623.cpp:10:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_queue.h:271:5: note: template<class _Tp, class _Seq> bool std::operator==(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_queue.h:271:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::queue<_Tp, _Seq>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/deque:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:60,
                 from 0_0_21504404_23623.cpp:10:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:2029:5: note: template<class _Tp, class _Alloc> bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator==(const deque<_Tp, _Alloc>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:2029:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::deque<_Tp, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/deque:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:60,
                 from 0_0_21504404_23623.cpp:10:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:258:5: note: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:258:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/deque:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:60,
                 from 0_0_21504404_23623.cpp:10:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:251:5: note: template<class _Tp, class _Ref, class _Ptr> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_deque.h:251:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:62:0,
                 from 0_0_21504404_23623.cpp:8:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_multiset.h:777:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator==(const std::multiset<_Key, _Compare, _Alloc>&, const std::multiset<_Key, _Compare, _Alloc>&)
     operator==(const multiset<_Key, _Compare, _Alloc>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_multiset.h:777:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::multiset<_Key, _Compare, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from 0_0_21504404_23623.cpp:8:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:793:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator==(const std::set<_Key, _Compare, _Alloc>&, const std::set<_Key, _Compare, _Alloc>&)
     operator==(const set<_Key, _Compare, _Alloc>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:793:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::set<_Key, _Compare, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:62:0,
                 from 0_0_21504404_23623.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_multimap.h:903:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_multimap.h:903:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:61:0,
                 from 0_0_21504404_23623.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:1000:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:1000:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:63:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:61,
                 from 0_0_21504404_23623.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/c++/tuple:846:5: note: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Args1 ...>&, const std::tuple<_Args2 ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/tuple:846:5: note:   template argument deduction/substitution failed:
0_0_21504404_23623.cpp:60:33: note:   'node' is not derived from 'const std::tuple<_Args1 ...>'
             if(i>=1&&b[i]==b[i-1]){
                                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/tuple:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:63,
                 from GCC4.9.2/x86_64-w64-ming


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