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View Compilation Error

0_0_14181650_31478.cpp: In function 'void insert(long long int, int)':
0_0_14181650_31478.cpp:30:2: error: reference to 'next' is ambiguous
  next[k2]=fir[k]; fir[k]=k2;
  ^
0_0_14181650_31478.cpp:12:48: note: candidates are: int next [210000]
 int p[110000],len,n,m,d[110000],pd[mo],fir[mo],next[210000],sign,A[210000],B[210000];
                                                ^
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++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14181650_31478.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_14181650_31478.cpp: In function 'int find(int, int)':
0_0_14181650_31478.cpp:44:24: error: reference to 'next' is ambiguous
  for (int i=fir[k];i;i=next[i]) if (W[i]==k3) return w[i];
                        ^
0_0_14181650_31478.cpp:12:48: note: candidates are: int next [210000]
 int p[110000],len,n,m,d[110000],pd[mo],fir[mo],next[210000],sign,A[210000],B[210000];
                                                ^
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++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14181650_31478.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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