0_0_21022683_2526.cpp: In function 'void add(int, int)':
0_0_21022683_2526.cpp:23:2: error: reference to 'next' is ambiguous
next[up] = first[y];
^
0_0_21022683_2526.cpp:16:46: note: candidates are: int next [100010]
int n, m, up, l[N], r[N], first[N], edge[N], next[N], f[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++/algorithm:61,
from 0_0_21022683_2526.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_21022683_2526.cpp: In function 'void dfs(int)':
0_0_21022683_2526.cpp:40:7: error: reference to 'next' is ambiguous
i = next[i];
^
0_0_21022683_2526.cpp:16:46: note: candidates are: int next [100010]
int n, m, up, l[N], r[N], first[N], edge[N], next[N], f[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++/algorithm:61,
from 0_0_21022683_2526.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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