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View Compilation Error

0_0_35547644_32111.cpp: In function 'void add_edge(int, int, int)':
0_0_35547644_32111.cpp:17:2: error: reference to 'next' is ambiguous
  next[tot] = head[u], head[u] = tot;
  ^
0_0_35547644_32111.cpp:13:42: note: candidates are: int next [200010]
 int n, m, ans, d[N], p[N], tot, head[N], next[N * 2];
                                          ^
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++/vector:60,
                 from 0_0_35547644_32111.cpp:2:
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_35547644_32111.cpp: In function 'void dp(int, int)':
0_0_35547644_32111.cpp:26:28: error: reference to 'next' is ambiguous
  for(int i=head[u]; i; i = next[i]) {
                            ^
0_0_35547644_32111.cpp:13:42: note: candidates are: int next [200010]
 int n, m, ans, d[N], p[N], tot, head[N], next[N * 2];
                                          ^
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++/vector:60,
                 from 0_0_35547644_32111.cpp:2:
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_35547644_32111.cpp: In function 'int main()':
0_0_35547644_32111.cpp:43:10: error: reference to 'next' is ambiguous
   memset(next, 0, sizeof(next)); 
          ^
0_0_35547644_32111.cpp:13:42: note: candidates are: int next [200010]
 int n, m, ans, d[N], p[N], tot, head[N], next[N * 2];
                                          ^
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++/vector:60,
                 from 0_0_35547644_32111.cpp:2:
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_35547644_32111.cpp:43:26: error: reference to 'next' is ambiguous
   memset(next, 0, sizeof(next)); 
                          ^
0_0_35547644_32111.cpp:13:42: note: candidates are: int next [200010]
 int n, m, ans, d[N], p[N], tot, head[N], next[N * 2];
                                          ^
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++/vector:60,
                 from 0_0_35547644_32111.cpp:2:
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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