/in/foo.cc: In function 'void getNext()':
/in/foo.cc:14:20: error: reference to 'next' is ambiguous
     j = 0; k = -1; next[0] = -1;
                    ^~~~
/in/foo.cc:7:5: note: candidates are: int next [10002]
 int next[N];
     ^~~~
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:1:
/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:17:13: error: reference to 'next' is ambiguous
             next[++j] = ++k;
             ^~~~
/in/foo.cc:7:5: note: candidates are: int next [10002]
 int next[N];
     ^~~~
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:1:
/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:19:17: error: reference to 'next' is ambiguous
             k = next[k];
                 ^~~~
/in/foo.cc:7:5: note: candidates are: int next [10002]
 int next[N];
     ^~~~
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:1:
/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 'int KMP_Index()':
/in/foo.cc:34:17: error: reference to 'next' is ambiguous
             j = next[j];
                 ^~~~
/in/foo.cc:7:5: note: candidates are: int next [10002]
 int next[N];
     ^~~~
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:1:
/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 'int main()':
/in/foo.cc:43:9: warning: unused variable 'i' [-Wunused-variable]
     int i, cc;
         ^
/in/foo.cc:43:12: warning: unused variable 'cc' [-Wunused-variable]
     int i, cc;
            ^~
/in/foo.cc: In function 'int KMP_Index()':
/in/foo.cc:38:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^