0_0_34415919_20059.cpp: In function 'void add(int, int)':
0_0_34415919_20059.cpp:40:20: error: reference to 'next' is ambiguous
ver[++tot] = y,next[tot] = head[x],head[x] = tot;
^
0_0_34415919_20059.cpp:37:31: note: candidates are: int next [1999998]
int deg[1994999],ver[1999998],next[1999998],head[1999998];
^
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/stl_tree.h:61,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
from 0_0_34415919_20059.cpp:7:
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_34415919_20059.cpp: In function 'void topsort()':
0_0_34415919_20059.cpp:53:33: error: reference to 'next' is ambiguous
for(int i=head[x]; i; i=next[i])
^
0_0_34415919_20059.cpp:37:31: note: candidates are: int next [1999998]
int deg[1994999],ver[1999998],next[1999998],head[1999998];
^
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/stl_tree.h:61,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
from 0_0_34415919_20059.cpp:7:
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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