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View Compilation Error

0_0_25077563_13483.cpp: In function 'bool match(int, int)':
0_0_25077563_13483.cpp:42:14: error: reference to 'next' is ambiguous
         if ((next[0][u][i]>=0 && vis[0][next[0][u][i]])^(next[1][v][i]>=0 && vis[1][next[1][v][i]])) return false;
              ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:42:41: error: reference to 'next' is ambiguous
         if ((next[0][u][i]>=0 && vis[0][next[0][u][i]])^(next[1][v][i]>=0 && vis[1][next[1][v][i]])) return false;
                                         ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:42:58: error: reference to 'next' is ambiguous
         if ((next[0][u][i]>=0 && vis[0][next[0][u][i]])^(next[1][v][i]>=0 && vis[1][next[1][v][i]])) return false;
                                                          ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:42:85: error: reference to 'next' is ambiguous
         if ((next[0][u][i]>=0 && vis[0][next[0][u][i]])^(next[1][v][i]>=0 && vis[1][next[1][v][i]])) return false;
                                                                                     ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp: In function 'bool check()':
0_0_25077563_13483.cpp:56:17: error: reference to 'next' is ambiguous
             if (next[0][u][i]>0 && vis[0][next[0][u][i]]){
                 ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:56:43: error: reference to 'next' is ambiguous
             if (next[0][u][i]>0 && vis[0][next[0][u][i]]){
                                           ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:57:23: error: reference to 'next' is ambiguous
                 if (f[next[0][u][i]][next[1][v][i]]) continue;
                       ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:57:38: error: reference to 'next' is ambiguous
                 if (f[next[0][u][i]][next[1][v][i]]) continue;
                                      ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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_25077563_13483.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_25077563_13483.cpp:58:27: error: reference to 'next' is ambiguous
                 Q.push(mp(next[0][u][i],next[1][v][i]));
                           ^
0_0_25077563_13483.cpp:9:27: note: in definition of macro 'mp'
 #define mp(x,y) make_pair(x,y)
                           ^
0_0_25077563_13483.cpp:12:5: note: candidates are: int next [2][2020][26]
 int next[2][maxn][26],tag[2][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 


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