Eroare de compilare: user.cpp: In function ‘void BFS()’: user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) ^ user.cpp:41:13: error: reference to ‘next’ is ambiguous next[nod].push_back(a[nod][i]); ^ user.cpp:9:14: note: candidates are: std::vector<int> next [100004] vector <int> next[N]; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/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 ^ user.cpp: In function ‘int DFSup(int, int)’: user.cpp:50:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ^ user.cpp: In function ‘int DFSdown(int, int)’: user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ^ user.cpp: In function ‘void Read2()’: user.cpp:70:17: warning: unused variable ‘ok2’ [-Wunused-variable] int x,y,ok1,ok2; ^