Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[a].size(); i++) ^ user.cpp:42:17: error: reference to ‘prev’ is ambiguous prev[v[a][i]].push_back(a); ^ user.cpp:12:14: note: candidates are: std::vector<int> prev [7510] vector <int> prev[7510]; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/vector:60, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:46:17: error: reference to ‘prev’ is ambiguous prev[v[a][i]].push_back(a); ^ user.cpp:12:14: note: candidates are: std::vector<int> prev [7510] vector <int> prev[7510]; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/vector:60, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:55:21: error: reference to ‘prev’ is ambiguous for (i=0; i<prev[a].size(); i++) ^ user.cpp:12:14: note: candidates are: std::vector<int> prev [7510] vector <int> prev[7510]; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/vector:60, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:56:16: error: reference to ‘prev’ is ambiguous q.push(prev[a][i]),fr[a]++; ^ user.cpp:12:14: note: candidates are: std::vector<int> prev [7510] vector <int> prev[7510]; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/vector:60, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)