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View Compilation Error

0_0_20367956_21587.cpp: In function 'void Add_Edge(int, int, int)':
0_0_20367956_21587.cpp:33:5: error: reference to 'next' is ambiguous
     next[tot] = fir[u], fir[u] = tot ++;  
     ^
0_0_20367956_21587.cpp:26:13: note: candidates are: int next [12100]
 int fir[N], next[M], tot;  
             ^
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++/algorithm:61,
                 from 0_0_20367956_21587.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_20367956_21587.cpp: In function 'void Spfa()':
0_0_20367956_21587.cpp:92:35: error: reference to 'next' is ambiguous
         for(i = fir[A.u]; ~i; i = next[i])  
                                   ^
0_0_20367956_21587.cpp:26:13: note: candidates are: int next [12100]
 int fir[N], next[M], tot;  
             ^
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++/algorithm:61,
                 from 0_0_20367956_21587.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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