Compilare: user.cpp: In function ‘int main()’: user.cpp:40:10: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,t,m,x,y,k,px,py,ok,a,b,aa,bb; ^ user.cpp:40:28: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int n,i,j,t,m,x,y,k,px,py,ok,a,b,aa,bb; ^