0_0_17749591_17244.cpp: In function 'void add_edge(int, int)':
0_0_17749591_17244.cpp:16:5: error: reference to 'next' is ambiguous
next[tot]=head[a]; //next 数组
^
0_0_17749591_17244.cpp:9:10: note: candidates are: int next [20005]
int v[N],next[N],head[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++/string:40,
from 0_0_17749591_17244.cpp:2:
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_17749591_17244.cpp: In function 'void dfs(int, int)':
0_0_17749591_17244.cpp:22:31: error: reference to 'next' is ambiguous
for(int i=head[u];i!=-1;i=next[i]) //遍历i的所有子节点
^
0_0_17749591_17244.cpp:9:10: note: candidates are: int next [20005]
int v[N],next[N],head[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++/string:40,
from 0_0_17749591_17244.cpp:2:
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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