0_0_24813676_20183.cpp: In function 'void dfs1(int, int)':
0_0_24813676_20183.cpp:48:24: error: reference to 'next' is ambiguous
for(int i=head[u];i;i=next[i]){
^
0_0_24813676_20183.cpp:7:73: note: candidates are: int next [200020]
int V[maxn],rt[maxn],ch[maxn*17][2],val[maxn*17],head[maxn],to[maxn<<1],next[maxn<<1],f[maxn],top[maxn],dep[maxn],son[maxn],sz[maxn],tot,e;
^
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_24813676_20183.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_24813676_20183.cpp: In function 'void dfs2(int, int)':
0_0_24813676_20183.cpp:61:24: error: reference to 'next' is ambiguous
for(int i=head[u];i;i=next[i]){
^
0_0_24813676_20183.cpp:7:73: note: candidates are: int next [200020]
int V[maxn],rt[maxn],ch[maxn*17][2],val[maxn*17],head[maxn],to[maxn<<1],next[maxn<<1],f[maxn],top[maxn],dep[maxn],son[maxn],sz[maxn],tot,e;
^
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_24813676_20183.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_24813676_20183.cpp: In function 'void add(int, int)':
0_0_24813676_20183.cpp:77:2: error: reference to 'next' is ambiguous
next[e]=head[x];
^
0_0_24813676_20183.cpp:7:73: note: candidates are: int next [200020]
int V[maxn],rt[maxn],ch[maxn*17][2],val[maxn*17],head[maxn],to[maxn<<1],next[maxn<<1],f[maxn],top[maxn],dep[maxn],son[maxn],sz[maxn],tot,e;
^
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_24813676_20183.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
^
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