Eroare de compilare: main.cpp: In function 'void bfs(int)': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[q.front()].size(); i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:26:31: error: no matching function for call to 'std::vector<std::pair<int, int> >::push_back()' ans.push_back() ^ In file included from /usr/include/c++/6/vector:64:0, from /usr/include/c++/6/queue:61, from main.cpp:2: /usr/include/c++/6/bits/stl_vector.h:914:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>] push_back(const value_type& __x) ^~~~~~~~~ /usr/include/c++/6/bits/stl_vector.h:914:7: note: candidate expects 1 argument, 0 provided /usr/include/c++/6/bits/stl_vector.h:932:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, int>] push_back(value_type&& __x) ^~~~~~~~~ /usr/include/c++/6/bits/stl_vector.h:932:7: note: candidate expects 1 argument, 0 provided Non zero exit status: 1