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View Compilation Error

0_0_20649778_30885.cpp: In function 'void add(int, int)':
0_0_20649778_30885.cpp:23:2: error: reference to 'next' is ambiguous
  next[up] = first[y];
  ^
0_0_20649778_30885.cpp:16:46: note: candidates are: int next [100010]
 int n, m, up, l[N], r[N], first[N], edge[N], next[N], f[N];
                                              ^
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++/algorithm:61,
                 from 0_0_20649778_30885.cpp:3:
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_20649778_30885.cpp: In function 'void dfs(int)':
0_0_20649778_30885.cpp:40:7: error: reference to 'next' is ambiguous
   i = next[i];
       ^
0_0_20649778_30885.cpp:16:46: note: candidates are: int next [100010]
 int n, m, up, l[N], r[N], first[N], edge[N], next[N], f[N];
                                              ^
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++/algorithm:61,
                 from 0_0_20649778_30885.cpp:3:
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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