Compilare: user.cpp: In function ‘void df(int)’: user.cpp:15:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[vf].size();i++) ^ user.cpp:13:11: warning: unused variable ‘vfcrt’ [-Wunused-variable] int i,vfcrt; ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[a].size();i++) ^ user.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i!=v[a].size()) ^ user.cpp: In function ‘void euler(int)’: user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[vf].size();i++) ^