Compilare: user.cpp: In function ‘void lee(int)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[x].size(); i++) ^ user.cpp: In function ‘void df(int)’: user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[x].size(); i++) ^ user.cpp:43:16: warning: unused variable ‘j’ [-Wunused-variable] int i,ok=1,j,k=2; ^ user.cpp:43:18: warning: unused variable ‘k’ [-Wunused-variable] int i,ok=1,j,k=2; ^ user.cpp:44:11: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int x,l; ^