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0_0_14962709_16735.cpp: In function 'void solve()':
0_0_14962709_16735.cpp:25:13: error: reference to 'next' is ambiguous
             next[i][j] = s.length();
             ^
0_0_14962709_16735.cpp:12:5: note: candidates are: int next [100][4]
 int next[MAX_k][4];
     ^
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_14962709_16735.cpp:3:
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
     ^