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View Compilation Error

0_0_28910177_17648.cpp: In function 'void Add(int, int, int)':
0_0_28910177_17648.cpp:10:38: error: reference to 'next' is ambiguous
 inline void Add(int u,int v,int t) { next[++l]=head[u],head[u]=l,go[l]=v,cost[l]=t; }
                                      ^
0_0_28910177_17648.cpp:8:47: note: candidates are: int next [400020]
 int T,n,l,r,i,j,u,v,x,y,t,b[N+N],d[N],head[N],next[N*4],go[N*4],cost[N*4];
                                               ^
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++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_28910177_17648.cpp:4:
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_28910177_17648.cpp: In function 'int main()':
0_0_28910177_17648.cpp:23:29: error: reference to 'next' is ambiguous
   { for (j=head[u=b[l]];j;j=next[j])
                             ^
0_0_28910177_17648.cpp:8:47: note: candidates are: int next [400020]
 int T,n,l,r,i,j,u,v,x,y,t,b[N+N],d[N],head[N],next[N*4],go[N*4],cost[N*4];
                                               ^
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++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_28910177_17648.cpp:4:
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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