Compilare: user.cpp: In function ‘void BF()’: user.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) { ^ user.cpp:22:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,urm; ^ user.cpp:23:18: warning: variable ‘cact’ set but not used [-Wunused-but-set-variable] double cost, cact; ^ user.cpp: In function ‘int main()’: user.cpp:63:28: warning: unused variable ‘Q’ [-Wunused-variable] f>>x>>y>>cost; int Q=cost; ^