0_0_17382018_26921.cpp: In function 'void insert(int, int, int)':
0_0_17382018_26921.cpp:25:2: error: reference to 'next' is ambiguous
next[tot]=first[x];
^
0_0_17382018_26921.cpp:13:34: note: candidates are: int next [200005]
int tot,go[200005],first[200005],next[200005];
^
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_17382018_26921.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_17382018_26921.cpp: In function 'int dfs(int, int)':
0_0_17382018_26921.cpp:36:26: error: reference to 'next' is ambiguous
for (int i=first[x];i;i=next[i]){
^
0_0_17382018_26921.cpp:13:34: note: candidates are: int next [200005]
int tot,go[200005],first[200005],next[200005];
^
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_17382018_26921.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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