Compilare: user.cpp: In function ‘std::istream& operator>>(std::istream&, cerc&)’: user.cpp:35:30: warning: no return statement in function returning non-void [-Wreturn-type] i >> c.c.x >> c.c.y >> c.r; } ^ user.cpp: In function ‘void mk_graf(const std::vector<cerc>&, std::vector<std::vector<int> >&, int&)’: user.cpp:88:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cercuri.size(); ++i){ ^ user.cpp:89:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cercuri.size(); ++j){ ^ user.cpp:107:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < puncte_cerc.size()-1; ++i){ ^ user.cpp: In function ‘int dfs(int, const std::vector<std::vector<int> >&, int&, int&, std::vector<bool>&)’: user.cpp:129:47: warning: no return statement in function returning non-void [-Wreturn-type] dfs(next, graf, nr_vf, nr_muc, e_viz); } } } ^