0_0_17807805_17688.cpp: In function 'void build(int, int)':
0_0_17807805_17688.cpp:9:39: error: reference to 'next' is ambiguous
void build(int a, int b){go[++p] = b; next[p] = head[a]; head[a] = p;}
^
0_0_17807805_17688.cpp:8:26: note: candidates are: int next [200200]
int head[N], go[N << 1], next[N << 1], p;
^
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++/algorithm:61,
from 0_0_17807805_17688.cpp:3:
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_17807805_17688.cpp: In function 'void dfs(int, int)':
0_0_17807805_17688.cpp:14:31: error: reference to 'next' is ambiguous
for (int i = head[u]; i; i = next[i])
^
0_0_17807805_17688.cpp:8:26: note: candidates are: int next [200200]
int head[N], go[N << 1], next[N << 1], p;
^
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++/algorithm:61,
from 0_0_17807805_17688.cpp:3:
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_17807805_17688.cpp: In function 'void dfs_2(int, int)':
0_0_17807805_17688.cpp:39:31: error: reference to 'next' is ambiguous
for (int i = head[u]; i; i = next[i])
^
0_0_17807805_17688.cpp:8:26: note: candidates are: int next [200200]
int head[N], go[N << 1], next[N << 1], p;
^
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++/algorithm:61,
from 0_0_17807805_17688.cpp:3:
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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