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View Compilation Error

0_0_30449126_74.cpp: In function 'void Add(int, int, int)':
0_0_30449126_74.cpp:24:5: error: reference to 'next' is ambiguous
     next[cnt]=head[u];
     ^
0_0_30449126_74.cpp:21:23: note: candidates are: int next [50010]
 int cnt,head[N],to[M],next[M],deep[N],amount[M],in[N],out[N],cur[N],n,m;
                       ^
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_30449126_74.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_30449126_74.cpp: In function 'int bfs(int, int)':
0_0_30449126_74.cpp:46:37: error: reference to 'next' is ambiguous
         for(int i=head[u]; i!=-1; i=next[i])
                                     ^
0_0_30449126_74.cpp:21:23: note: candidates are: int next [50010]
 int cnt,head[N],to[M],next[M],deep[N],amount[M],in[N],out[N],cur[N],n,m;
                       ^
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_30449126_74.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_30449126_74.cpp: In function 'int dfs(int, int, int)':
0_0_30449126_74.cpp:63:32: error: reference to 'next' is ambiguous
     for(int i=cur[s]; i!=-1; i=next[i])
                                ^
0_0_30449126_74.cpp:21:23: note: candidates are: int next [50010]
 int cnt,head[N],to[M],next[M],deep[N],amount[M],in[N],out[N],cur[N],n,m;
                       ^
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_30449126_74.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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