0_0_19810722_25701.cpp: In function 'void Build(int, int)':
0_0_19810722_25701.cpp:12:17: error: reference to 'next' is ambiguous
to[++tot] = t, next[tot] = head[s], head[s] = tot;
^
0_0_19810722_25701.cpp:8:15: note: candidates are: int next [1500]
int to[1500], next[1500], head[2100], pre[2100];
^
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_19810722_25701.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_19810722_25701.cpp: In function 'bool dfs(int)':
0_0_19810722_25701.cpp:16:30: error: reference to 'next' is ambiguous
for(int i = head[x]; i; i = next[i]) {
^
0_0_19810722_25701.cpp:8:15: note: candidates are: int next [1500]
int to[1500], next[1500], head[2100], pre[2100];
^
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_19810722_25701.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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