Compilare: user.cpp: In function ‘int bfs1()’: user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sl[fr].size();i++) ^ user.cpp:45:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int bfs2()’: user.cpp:56:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sl[fr].size();i++) ^ user.cpp:68:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^