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View Compilation Error

0_0_38597160_4458.cpp: In function 'void add_edge(int, int)':
0_0_38597160_4458.cpp:23:19: error: reference to 'next' is ambiguous
     to[ecnt] = v; next[ecnt] = head[u]; head[u] = ecnt++;
                   ^~~~
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/char_traits.h:39,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ios:40,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ostream:38,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:39,
                 from 0_0_38597160_4458.cpp:3:
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_38597160_4458.cpp:14:15: note:                 'int next [200020]'
 int to[MAXE], next[MAXE];
               ^~~~
0_0_38597160_4458.cpp:24:19: error: reference to 'next' is ambiguous
     to[ecnt] = u; next[ecnt] = head[v]; head[v] = ecnt++;
                   ^~~~
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/char_traits.h:39,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ios:40,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ostream:38,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:39,
                 from 0_0_38597160_4458.cpp:3:
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_38597160_4458.cpp:14:15: note:                 'int next [200020]'
 int to[MAXE], next[MAXE];
               ^~~~
0_0_38597160_4458.cpp: In function 'void lca(int, int)':
0_0_38597160_4458.cpp:113:34: error: reference to 'next' is ambiguous
     for(int p = head[u]; ~p; p = next[p]) {
                                  ^~~~
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/char_traits.h:39,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ios:40,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ostream:38,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:39,
                 from 0_0_38597160_4458.cpp:3:
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_38597160_4458.cpp:14:15: note:                 'int next [200020]'
 int to[MAXE], next[MAXE];
               ^~~~
0_0_38597160_4458.cpp: In function 'Node* dfs(int, int)':
0_0_38597160_4458.cpp:132:34: error: reference to 'next' is ambiguous
     for(int p = head[u]; ~p; p = next[p]) {
                                  ^~~~
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/char_traits.h:39,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ios:40,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/ostream:38,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/iostream:39,
                 from 0_0_38597160_4458.cpp:3:
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_38597160_4458.cpp:14:15: note:                 'int next [200020]'
 int to[MAXE], next[MAXE];
               ^~~~


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