Compilare: user.cpp: In function ‘int main()’: user.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=a.size()-1;i++) ^ user.cpp:12:6: warning: variable ‘n’ set but not used [-Wunused-but-set-variable] int n,x,i=32,y,w,l,v[1000]; ^ user.cpp:12:15: warning: unused variable ‘y’ [-Wunused-variable] int n,x,i=32,y,w,l,v[1000]; ^ user.cpp:12:19: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int n,x,i=32,y,w,l,v[1000]; ^