Compilare: user.cpp: In function ‘int main()’: user.cpp:22:16: warning: unused variable ‘xa1’ [-Wunused-variable] int i,j,db,xa1,xa2,ya1,ya2; ^ user.cpp:22:20: warning: unused variable ‘xa2’ [-Wunused-variable] int i,j,db,xa1,xa2,ya1,ya2; ^ user.cpp:22:24: warning: unused variable ‘ya1’ [-Wunused-variable] int i,j,db,xa1,xa2,ya1,ya2; ^ user.cpp:22:28: warning: unused variable ‘ya2’ [-Wunused-variable] int i,j,db,xa1,xa2,ya1,ya2; ^ user.cpp:28:9: warning: unused variable ‘m’ [-Wunused-variable] int m,n; ^