0_0_29475940_32269.cpp: In function 'void add(int, int)':
0_0_29475940_32269.cpp:26:5: error: reference to 'next' is ambiguous
next[top]=head[u];
^
0_0_29475940_32269.cpp:20:14: note: candidates are: int next [2000002]
int head[NS],next[NS<<1],to[NS<<1];
^
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++/vector:60,
from 0_0_29475940_32269.cpp:6:
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_29475940_32269.cpp: In function 'void dfs(int, int)':
0_0_29475940_32269.cpp:52:33: error: reference to 'next' is ambiguous
for (int i=head[rt];i!=-1;i=next[i])
^
0_0_29475940_32269.cpp:20:14: note: candidates are: int next [2000002]
int head[NS],next[NS<<1],to[NS<<1];
^
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++/vector:60,
from 0_0_29475940_32269.cpp:6:
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_29475940_32269.cpp: In function 'void dfs2(int, int)':
0_0_29475940_32269.cpp:73:33: error: reference to 'next' is ambiguous
for (int i=head[rt];i!=-1;i=next[i])
^
0_0_29475940_32269.cpp:20:14: note: candidates are: int next [2000002]
int head[NS],next[NS<<1],to[NS<<1];
^
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++/vector:60,
from 0_0_29475940_32269.cpp:6:
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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