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View Compilation Error

0_0_13895123_30908.cpp: In function 'void build(int, int, int)':
0_0_13895123_30908.cpp:19:2: error: reference to 'next' is ambiguous
  next[++op]=head[a];head[a]=op;to[op]=b;f[op]=c;
  ^
0_0_13895123_30908.cpp:8:28: note: candidates are: int next [600020]
 int head[maxn],head2[maxn],next[maxm*2],to[maxm*2],f[maxm*2],op=1;
                            ^
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_13895123_30908.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_13895123_30908.cpp:20:2: error: reference to 'next' is ambiguous
  next[++op]=head[b];head[b]=op;to[op]=a;f[op]=0;
  ^
0_0_13895123_30908.cpp:8:28: note: candidates are: int next [600020]
 int head[maxn],head2[maxn],next[maxm*2],to[maxm*2],f[maxm*2],op=1;
                            ^
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_13895123_30908.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_13895123_30908.cpp: In function 'bool bfs()':
0_0_13895123_30908.cpp:31:31: error: reference to 'next' is ambiguous
   for(int pos=head[s];pos;pos=next[pos]) {
                               ^
0_0_13895123_30908.cpp:8:28: note: candidates are: int next [600020]
 int head[maxn],head2[maxn],next[maxm*2],to[maxm*2],f[maxm*2],op=1;
                            ^
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_13895123_30908.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_13895123_30908.cpp: In function 'bool find(int, int)':
0_0_13895123_30908.cpp:59:31: error: reference to 'next' is ambiguous
  for(int&pos=head2[s];pos;pos=next[pos])
                               ^
0_0_13895123_30908.cpp:8:28: note: candidates are: int next [600020]
 int head[maxn],head2[maxn],next[maxm*2],to[maxm*2],f[maxm*2],op=1;
                            ^
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_13895123_30908.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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