Compilare: main.cpp: In function 'int main()': main.cpp:22:10: warning: unused variable 'last' [-Wunused-variable] int n,i,last,x,m,l,j,k; ^~~~ main.cpp:4:11: warning: unused variable 'first' [-Wunused-variable] #define x first ^ main.cpp:22:15: note: in expansion of macro 'x' int n,i,last,x,m,l,j,k; ^ main.cpp:22:17: warning: unused variable 'm' [-Wunused-variable] int n,i,last,x,m,l,j,k; ^ main.cpp:22:19: warning: unused variable 'l' [-Wunused-variable] int n,i,last,x,m,l,j,k; ^