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View Compilation Error

0_0_16350936_21169.cpp: In function 'void addedge(int, int)':
0_0_16350936_21169.cpp:20:2: error: reference to 'next' is ambiguous
  next[a[0]]=a[u];
  ^
0_0_16350936_21169.cpp:12:15: note: candidates are: int next [512]
 int a[N],b[M],next[M];
               ^
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_16350936_21169.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_16350936_21169.cpp: In function 'void dfs(int, int)':
0_0_16350936_21169.cpp:28:23: error: reference to 'next' is ambiguous
  for(i=a[cur];i!=-1;i=next[i])
                       ^
0_0_16350936_21169.cpp:12:15: note: candidates are: int next [512]
 int a[N],b[M],next[M];
               ^
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_16350936_21169.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_16350936_21169.cpp: In function 'void calc(int, int)':
0_0_16350936_21169.cpp:43:23: error: reference to 'next' is ambiguous
  for(i=a[cur];i!=-1;i=next[i])
                       ^
0_0_16350936_21169.cpp:12:15: note: candidates are: int next [512]
 int a[N],b[M],next[M];
               ^
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_16350936_21169.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_16350936_21169.cpp: In function 'void solve(int)':
0_0_16350936_21169.cpp:63:21: error: reference to 'next' is ambiguous
  for(i=a[p];i!=-1;i=next[i]){
                     ^
0_0_16350936_21169.cpp:12:15: note: candidates are: int next [512]
 int a[N],b[M],next[M];
               ^
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_16350936_21169.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_16350936_21169.cpp:66:22: error: reference to 'next' is ambiguous
   for(j=a[p];j!=-1;j=next[j])
                      ^
0_0_16350936_21169.cpp:12:15: note: candidates are: int next [512]
 int a[N],b[M],next[M];
               ^
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_16350936_21169.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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