Compilare: user.cpp: In function ‘int main()’: user.cpp:9:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i,j,k,cont=0,cn; ^ user.cpp:9:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,k,cont=0,cn; ^ user.cpp:9:15: warning: unused variable ‘k’ [-Wunused-variable] int n,i,j,k,cont=0,cn; ^