/in/foo.cc: In function 'void address(int)':
/in/foo.cc:13:5: error: reference to 'next' is ambiguous
     next[cnt]=hashline[w & M];
     ^~~~
/in/foo.cc:9:5: note: candidates are: int next [12600001]
 int next[12600001];
     ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/algorithm:61,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_iterator_base_funcs.h:205:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~
/in/foo.cc: In function 'bool pure(int)':
/in/foo.cc:19:38: error: reference to 'next' is ambiguous
     for(int i=hashline[w & M]; i ; i=next[i])
                                      ^~~~
/in/foo.cc:9:5: note: candidates are: int next [12600001]
 int next[12600001];
     ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/algorithm:61,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_iterator_base_funcs.h:205:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~