Compilare: user.cpp: In function ‘int main()’: user.cpp:9:19: warning: unused variable ‘j’ [-Wunused-variable] int n, cn, i, j, k=0, x, y; ^ user.cpp:9:27: warning: unused variable ‘x’ [-Wunused-variable] int n, cn, i, j, k=0, x, y; ^ user.cpp:9:30: warning: unused variable ‘y’ [-Wunused-variable] int n, cn, i, j, k=0, x, y; ^