Compilare: user.cpp: In function ‘int main()’: user.cpp:22:13: warning: unused variable ‘x’ [-Wunused-variable] int m,i,x,y,p=0,d,u=0; ^ user.cpp:22:15: warning: unused variable ‘y’ [-Wunused-variable] int m,i,x,y,p=0,d,u=0; ^ user.cpp:23:20: warning: variable ‘o’ set but not used [-Wunused-but-set-variable] char a[100001],o[100001]; ^