0_0_18872094_11657.cpp: In function 'void add(int, int)':
0_0_18872094_11657.cpp:12:2: error: reference to 'next' is ambiguous
next[tot]=head[u];
^
0_0_18872094_11657.cpp:7:41: note: candidates are: int next [2000010]
int n,q,tot,min3,belong[N],Q[N],head[N],next[N<<1],to[N<<1],fa[N],ans[N];
^
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_18872094_11657.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_18872094_11657.cpp: In function 'int main()':
0_0_18872094_11657.cpp:46:28: error: reference to 'next' is ambiguous
for(int i=head[now];i;i=next[i]){
^
0_0_18872094_11657.cpp:7:41: note: candidates are: int next [2000010]
int n,q,tot,min3,belong[N],Q[N],head[N],next[N<<1],to[N<<1],fa[N],ans[N];
^
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_18872094_11657.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_18872094_11657.cpp:65:25: error: reference to 'next' is ambiguous
for(int i=head[1];i;i=next[i]){
^
0_0_18872094_11657.cpp:7:41: note: candidates are: int next [2000010]
int n,q,tot,min3,belong[N],Q[N],head[N],next[N<<1],to[N<<1],fa[N],ans[N];
^
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_18872094_11657.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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