0_0_14168129_7319.cpp: In function 'void add(int, int)':
0_0_14168129_7319.cpp:16:5: error: reference to 'next' is ambiguous
next[p]=head[x];
^
0_0_14168129_7319.cpp:8:28: note: candidates are: int next [200005]
int e[200005],head[200005],next[200005],cnt[50005],pt[50005],flag[50005];
^
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_14168129_7319.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_14168129_7319.cpp: In function 'void solve()':
0_0_14168129_7319.cpp:43:43: error: reference to 'next' is ambiguous
for(int j=head[pt[i]];j!=-1;j=next[j])
^
0_0_14168129_7319.cpp:8:28: note: candidates are: int next [200005]
int e[200005],head[200005],next[200005],cnt[50005],pt[50005],flag[50005];
^
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_14168129_7319.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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