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View Compilation Error

0_0_20898842_17621.cpp: In function 'void add(int, int, int, int)':
0_0_20898842_17621.cpp:14:52: error: reference to 'next' is ambiguous
     from[cnt]=u; to[cnt]=v; w[cnt]=wp; len[cnt]=p; next[cnt]=head[u]; head[u]=cnt++;
                                                    ^
0_0_20898842_17621.cpp:9:11: note: candidates are: int next [5050000]
 int to[M],next[M],len[M],w[M],from[M],head[N],pre[N],n,m,s,t,S,T,dis[N],q[M<<2],cnt,ans;
           ^
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_20898842_17621.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_20898842_17621.cpp:15:53: error: reference to 'next' is ambiguous
     from[cnt]=v; to[cnt]=u; w[cnt]=-wp; len[cnt]=0; next[cnt]=head[v]; head[v]=cnt++;
                                                     ^
0_0_20898842_17621.cpp:9:11: note: candidates are: int next [5050000]
 int to[M],next[M],len[M],w[M],from[M],head[N],pre[N],n,m,s,t,S,T,dis[N],q[M<<2],cnt,ans;
           ^
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_20898842_17621.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_20898842_17621.cpp: In function 'bool spfa()':
0_0_20898842_17621.cpp:48:34: error: reference to 'next' is ambiguous
         for(int i=head[sta];~i;i=next[i])
                                  ^
0_0_20898842_17621.cpp:9:11: note: candidates are: int next [5050000]
 int to[M],next[M],len[M],w[M],from[M],head[N],pre[N],n,m,s,t,S,T,dis[N],q[M<<2],cnt,ans;
           ^
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_20898842_17621.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_20898842_17621.cpp: In function 'bool check()':
0_0_20898842_17621.cpp:65:28: error: reference to 'next' is ambiguous
     for(int i=head[S];~i;i=next[i])
                            ^
0_0_20898842_17621.cpp:9:11: note: candidates are: int next [5050000]
 int to[M],next[M],len[M],w[M],from[M],head[N],pre[N],n,m,s,t,S,T,dis[N],q[M<<2],cnt,ans;
           ^
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_20898842_17621.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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