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View Compilation Error

0_0_15700466_25254.cpp: In function 'void add(int, int, int)':
0_0_15700466_25254.cpp:52:26: error: reference to 'next' is ambiguous
     to[edge]=v,w[edge]=c,next[edge]=head[u],head[u]=edge++;
                          ^
0_0_15700466_25254.cpp:13:19: note: candidates are: int next [2000005]
 int head[N],to[M],next[M],w[M],edge;
                   ^
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_15700466_25254.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_15700466_25254.cpp:53:26: error: reference to 'next' is ambiguous
     to[edge]=u,w[edge]=c,next[edge]=head[v],head[v]=edge++;
                          ^
0_0_15700466_25254.cpp:13:19: note: candidates are: int next [2000005]
 int head[N],to[M],next[M],w[M],edge;
                   ^
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_15700466_25254.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_15700466_25254.cpp: In function 'void bfs(int)':
0_0_15700466_25254.cpp:68:34: error: reference to 'next' is ambiguous
         for(int i=head[u]; ~i; i=next[i])
                                  ^
0_0_15700466_25254.cpp:13:19: note: candidates are: int next [2000005]
 int head[N],to[M],next[M],w[M],edge;
                   ^
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_15700466_25254.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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