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View Compilation Error

0_0_24948129_10349.cpp: In function 'void Update(int, int)':
0_0_24948129_10349.cpp:11:46: error: reference to 'next' is ambiguous
      edg[tot].u=u;edg[tot].v=v;edg[tot].next=next[u];next[u]=tot++; 
                                              ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:11:54: error: reference to 'next' is ambiguous
      edg[tot].u=u;edg[tot].v=v;edg[tot].next=next[u];next[u]=tot++; 
                                                      ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp: In function 'void Init()':
0_0_24948129_10349.cpp:15:13: error: reference to 'next' is ambiguous
      memset(next,-1,sizeof(next));
             ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:15:28: error: reference to 'next' is ambiguous
      memset(next,-1,sizeof(next));
                            ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:15:33: error: 'memset' was not declared in this scope
      memset(next,-1,sizeof(next));
                                 ^
0_0_24948129_10349.cpp: In function 'int Check()':
0_0_24948129_10349.cpp:26:29: error: 'memset' was not declared in this scope
     memset(vis,0,sizeof(vis));
                             ^
0_0_24948129_10349.cpp:34:11: error: reference to 'next' is ambiguous
        if(next[u]==-1) continue;
           ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:38:14: error: reference to 'next' is ambiguous
        while(next[u]!=-1) 
              ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:40:15: error: reference to 'next' is ambiguous
         v=edg[next[u]].v; next[u]=edg[next[u]].next;
               ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:40:27: error: reference to 'next' is ambiguous
         v=edg[next[u]].v; next[u]=edg[next[u]].next;
                           ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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_24948129_10349.cpp:1:
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_24948129_10349.cpp:40:39: error: reference to 'next' is ambiguous
         v=edg[next[u]].v; next[u]=edg[next[u]].next;
                                       ^
0_0_24948129_10349.cpp:6:21: note: candidates are: int next [20001]
 Node edg[50001];int next[20001],tot=0; //tot edgs 
                     ^
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:


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