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View Compilation Error

0_0_25171448_32404.cpp: In function 'void add(int, int, int)':
0_0_25171448_32404.cpp:12:9: error: reference to 'next' is ambiguous
  tot++; next[tot]=p[x]; a[tot]=y; p[x]=tot; remain[tot]=z;
         ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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_25171448_32404.cpp:13:9: error: reference to 'next' is ambiguous
  tot++; next[tot]=p[y]; a[tot]=x; p[y]=tot; remain[tot]=0;
         ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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_25171448_32404.cpp: In function 'bool bfs()':
0_0_25171448_32404.cpp:36:6: error: reference to 'next' is ambiguous
    v=next[v];
      ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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_25171448_32404.cpp: In function 'long long int find(int, int, int)':
0_0_25171448_32404.cpp:57:5: error: reference to 'next' is ambiguous
   u=next[u];
     ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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_25171448_32404.cpp: In function 'int main()':
0_0_25171448_32404.cpp:64:9: error: reference to 'next' is ambiguous
  memset(next,-1,sizeof(next));
         ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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_25171448_32404.cpp:64:24: error: reference to 'next' is ambiguous
  memset(next,-1,sizeof(next));
                        ^
0_0_25171448_32404.cpp:5:14: note: candidates are: int next [40020]
 int a[40020],next[40020],p[20010],remain[40020],tot;
              ^
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_25171448_32404.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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