/in/foo.c: In function 'main':
/in/foo.c:5:18: warning: variable 'max' set but not used [-Wunused-but-set-variable]
     int n,a[A],x,max=0;
                  ^~~
/in/foo.c:5:16: warning: unused variable 'x' [-Wunused-variable]
     int n,a[A],x,max=0;
                ^