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View Compilation Error

0_0_21729279_27681.cpp: In function 'void add(int, int)':
0_0_21729279_27681.cpp:13:2: error: reference to 'next' is ambiguous
  next[e]=head[a];
  ^
0_0_21729279_27681.cpp:6:23: note: candidates are: int next [100009]
 int index,dep[Maxn],e,next[Maxn],head[Maxn],to[Maxn],n,m,f[Maxn][logg];
                       ^
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_21729279_27681.cpp:2:
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_21729279_27681.cpp: In function 'void dfs(int)':
0_0_21729279_27681.cpp:17:24: error: reference to 'next' is ambiguous
  for(int i=head[a];i;i=next[i]){
                        ^
0_0_21729279_27681.cpp:6:23: note: candidates are: int next [100009]
 int index,dep[Maxn],e,next[Maxn],head[Maxn],to[Maxn],n,m,f[Maxn][logg];
                       ^
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_21729279_27681.cpp:2:
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_21729279_27681.cpp: In function 'void getld(int, int)':
0_0_21729279_27681.cpp:44:24: error: reference to 'next' is ambiguous
  for(int i=head[a];i;i=next[i])
                        ^
0_0_21729279_27681.cpp:6:23: note: candidates are: int next [100009]
 int index,dep[Maxn],e,next[Maxn],head[Maxn],to[Maxn],n,m,f[Maxn][logg];
                       ^
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_21729279_27681.cpp:2:
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_21729279_27681.cpp: In function 'int main()':
0_0_21729279_27681.cpp:62:22: error: 'memset' was not declared in this scope
   memset(f,0,sizeof f);
                      ^
0_0_21729279_27681.cpp:64:10: error: reference to 'next' is ambiguous
   memset(next,0,sizeof next);
          ^
0_0_21729279_27681.cpp:6:23: note: candidates are: int next [100009]
 int index,dep[Maxn],e,next[Maxn],head[Maxn],to[Maxn],n,m,f[Maxn][logg];
                       ^
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_21729279_27681.cpp:2:
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_21729279_27681.cpp:64:24: error: reference to 'next' is ambiguous
   memset(next,0,sizeof next);
                        ^
0_0_21729279_27681.cpp:6:23: note: candidates are: int next [100009]
 int index,dep[Maxn],e,next[Maxn],head[Maxn],to[Maxn],n,m,f[Maxn][logg];
                       ^
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_21729279_27681.cpp:2:
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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