0_0_19760766_20069.cpp: In function 'void add(int, int, int)':
0_0_19760766_20069.cpp:40:5: error: reference to 'next' is ambiguous
next[num]=first[u[num]];
^
0_0_19760766_20069.cpp:35:19: note: candidates are: int next [210000]
int first[2*MAXN],next[2*MAXN],u[2*MAXN],v[2*MAXN];
^
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_19760766_20069.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_19760766_20069.cpp: In function 'void dfs(int, int)':
0_0_19760766_20069.cpp:46:34: error: reference to 'next' is ambiguous
for(int e=first[a]; e!=-1; e=next[e])if(v[e]!=fa)
^
0_0_19760766_20069.cpp:35:19: note: candidates are: int next [210000]
int first[2*MAXN],next[2*MAXN],u[2*MAXN],v[2*MAXN];
^
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_19760766_20069.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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