/in/foo.cc: In function 'int main()':
/in/foo.cc:32:59: error: reference to 'next' is ambiguous
                 while(fix1 && s[i] != s[fix1 + 1]) fix1 = next[fix1];  
                                                           ^~~~
/in/foo.cc:20:9: note: candidates are: int next [1000005]
     int next[Nmax], cnt[Nmax];  
         ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:34:17: error: reference to 'next' is ambiguous
                 next[i] = fix1; cnt[i] = cnt[fix1] + 1;  
                 ^~~~
/in/foo.cc:20:9: note: candidates are: int next [1000005]
     int next[Nmax], cnt[Nmax];  
         ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:36:59: error: reference to 'next' is ambiguous
                 while(fix2 && s[i] != s[fix2 + 1]) fix2 = next[fix2];  
                                                           ^~~~
/in/foo.cc:20:9: note: candidates are: int next [1000005]
     int next[Nmax], cnt[Nmax];  
         ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:38:47: error: reference to 'next' is ambiguous
                 while(fix2 > (i >> 1)) fix2 = next[fix2];  
                                               ^~~~
/in/foo.cc:20:9: note: candidates are: int next [1000005]
     int next[Nmax], cnt[Nmax];  
         ^~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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
     ^~~~