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View Compilation Error

0_0_20504901_26841.cpp: In function 'void build(int, int, int)':
0_0_20504901_26841.cpp:16:5: error: reference to 'next' is ambiguous
     next[num]=first[x];  
     ^
0_0_20504901_26841.cpp:11:15: note: candidates are: int next [1100000]
 int val[maxn],next[maxn],first[maxn],b[maxn];  
               ^
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_20504901_26841.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_20504901_26841.cpp: In function 'void dfs(int, int, int)':
0_0_20504901_26841.cpp:33:28: error: reference to 'next' is ambiguous
     for(int i=first[u];i;i=next[i])  
                            ^
0_0_20504901_26841.cpp:11:15: note: candidates are: int next [1100000]
 int val[maxn],next[maxn],first[maxn],b[maxn];  
               ^
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_20504901_26841.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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