0_0_21803102_9024.cpp: In function 'void add(int, int)':
0_0_21803102_9024.cpp:12:18: error: reference to 'next' is ambiguous
to[++cnt] = y , next[cnt] = head[x] , head[x] = cnt;
^
0_0_21803102_9024.cpp:9:35: note: candidates are: int next [2100]
int w[N] , head[N] , to[N << 1] , next[N << 1] , cnt , m;
^
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_21803102_9024.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_21803102_9024.cpp: In function 'void dfs(int, int)':
0_0_21803102_9024.cpp:36:28: error: reference to 'next' is ambiguous
for(i = head[x] ; i ; i = next[i])
^
0_0_21803102_9024.cpp:9:35: note: candidates are: int next [2100]
int w[N] , head[N] , to[N << 1] , next[N << 1] , cnt , m;
^
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_21803102_9024.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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