0_0_38631247_21358.cpp: In function 'void Add_edge(int, int, int)':
0_0_38631247_21358.cpp:53:5: error: reference to 'next' is ambiguous
next[++ecnt] = first[u];
^~~~
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algobase.h:66,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/specfun.h:45,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/cmath:1892,
from 0_0_38631247_21358.cpp:12:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_iterator_base_funcs.h:213:5: note: candidates are: 'template<class _InputIterator> constexpr _InputIterator std::next(_InputIterator, typename std::iterator_traits<_Iter>::difference_type)'
next(_InputIterator __x, typename
^~~~
0_0_38631247_21358.cpp:29:17: note: 'int next [200020]'
int first[maxn],next[maxn << 1],ver[maxn << 1],ecnt;
^~~~
0_0_38631247_21358.cpp:57:5: error: reference to 'next' is ambiguous
next[++ecnt] = first[v];
^~~~
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algobase.h:66,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/specfun.h:45,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/cmath:1892,
from 0_0_38631247_21358.cpp:12:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_iterator_base_funcs.h:213:5: note: candidates are: 'template<class _InputIterator> constexpr _InputIterator std::next(_InputIterator, typename std::iterator_traits<_Iter>::difference_type)'
next(_InputIterator __x, typename
^~~~
0_0_38631247_21358.cpp:29:17: note: 'int next [200020]'
int first[maxn],next[maxn << 1],ver[maxn << 1],ecnt;
^~~~
0_0_38631247_21358.cpp: In function 'void Dfs(int, int, int)':
0_0_38631247_21358.cpp:69:40: error: reference to 'next' is ambiguous
for(int i = first[p]; i != -1; i = next[i]) if((v = ver[i]) != pre){
^~~~
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algobase.h:66,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/specfun.h:45,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/cmath:1892,
from 0_0_38631247_21358.cpp:12:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_iterator_base_funcs.h:213:5: note: candidates are: 'template<class _InputIterator> constexpr _InputIterator std::next(_InputIterator, typename std::iterator_traits<_Iter>::difference_type)'
next(_InputIterator __x, typename
^~~~
0_0_38631247_21358.cpp:29:17: note: 'int next [200020]'
int first[maxn],next[maxn << 1],ver[maxn << 1],ecnt;
^~~~
0_0_38631247_21358.cpp: In function 'void Dfs_pos(int, int)':
0_0_38631247_21358.cpp:85:40: error: reference to 'next' is ambiguous
for(int i = first[p]; i != -1; i = next[i]){
^~~~
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algobase.h:66,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/specfun.h:45,
from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/cmath:1892,
from 0_0_38631247_21358.cpp:12:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_iterator_base_funcs.h:213:5: note: candidates are: 'template<class _InputIterator> constexpr _InputIterator std::next(_InputIterator, typename std::iterator_traits<_Iter>::difference_type)'
next(_InputIterator __x, typename
^~~~
0_0_38631247_21358.cpp:29:17: note: 'int next [200020]'
int first[maxn],next[maxn << 1],ver[maxn << 1],ecnt;
^~~~
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