Compilare: user.cpp: In function ‘int BFS()’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) ^ user.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int BFSinvers()’: user.cpp:35:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) ^ user.cpp:43:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^