Eroare de compilare: user.cpp: In function ‘void solve()’: user.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[p].size(); i++) ~^~~~~~~~~~~~ user.cpp:44:5: error: reference to ‘prev’ is ambiguous prev[dist[y]+1].push_back(y); ^~~~ user.cpp:12:22: note: candidates are: std::vector<int> prev [7505] vector <int> a[NMAX],prev[NMAX],sol; ^~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from user.cpp:1: /usr/include/c++/6/bits/stl_iterator_base_funcs.h:217:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^~~~ user.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[p].size(); i++) ~^~~~~~~~~~~~ user.cpp:51:61: error: reference to ‘prev’ is ambiguous if(viz[a[p][i]]==1&&(dist[a[p][i]]==dist[p]-1&&(prev[dist[p]].size()==0||prev[dist[p]][0]!=a[p][i]))) ^~~~ user.cpp:12:22: note: candidates are: std::vector<int> prev [7505] vector <int> a[NMAX],prev[NMAX],sol; ^~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from user.cpp:1: /usr/include/c++/6/bits/stl_iterator_base_funcs.h:217:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^~~~ user.cpp:51:86: error: reference to ‘prev’ is ambiguous if(viz[a[p][i]]==1&&(dist[a[p][i]]==dist[p]-1&&(prev[dist[p]].size()==0||prev[dist[p]][0]!=a[p][i]))) ^~~~ user.cpp:12:22: note: candidates are: std::vector<int> prev [7505] vector <int> a[NMAX],prev[NMAX],sol; ^~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from user.cpp:1: /usr/include/c++/6/bits/stl_iterator_base_funcs.h:217:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)