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View Compilation Error

0_0_34031711_14944.cpp: In function 'void addedge(int, int)':
0_0_34031711_14944.cpp:12:2: error: reference to 'next' is ambiguous
  next[e]=first[x];
  ^
0_0_34031711_14944.cpp:6:16: note: candidates are: int next [200002]
 int to[maxn*2],next[maxn*2],first[maxn*2],depth[maxn],fa[maxn],son[maxn],s[maxn],p[maxn];
                ^
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_34031711_14944.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_34031711_14944.cpp: In function 'void dfs(int, int, int)':
0_0_34031711_14944.cpp:26:32: error: reference to 'next' is ambiguous
  for (int k=first[u]; k!=-1; k=next[k])
                                ^
0_0_34031711_14944.cpp:6:16: note: candidates are: int next [200002]
 int to[maxn*2],next[maxn*2],first[maxn*2],depth[maxn],fa[maxn],son[maxn],s[maxn],p[maxn];
                ^
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_34031711_14944.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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