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View Compilation Error

0_0_30001086_16465.cpp: In member function 'void PAM<name, LEN>::new1()':
0_0_30001086_16465.cpp:55:5: error: reference to 'next' is ambiguous
     next[tot]=last[back[i]],last[back[i]]=tot;
     ^
0_0_30001086_16465.cpp:9:21: note: candidates are: int next [500001]
 int tot=0,front[nn],next[nn],last[nn],stack[nn],exist[nn];
                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 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_30001086_16465.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:184:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^
0_0_30001086_16465.cpp: In member function 'void PAM<name, LEN>::DFS(int, int)':
0_0_30001086_16465.cpp:68:25: error: reference to 'next' is ambiguous
   for(int i=last[p];i;i=next[i])DFS(front[i],dep);
                         ^
0_0_30001086_16465.cpp:9:21: note: candidates are: int next [500001]
 int tot=0,front[nn],next[nn],last[nn],stack[nn],exist[nn];
                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 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_30001086_16465.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:184:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^


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