Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[y].size();i++) ^ user.cpp: In function ‘int bfs2(int)’: user.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[y].size();i++) ^ user.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^