/in/foo.c: In function 'main':
/in/foo.c:10:15: warning: variable 'maxi' set but not used [-Wunused-but-set-variable]
  int max=a[0],maxi=0;
               ^~~~
/in/foo.c:27:16: warning: 'b[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  n=n-b[num-1]+b[0];
               ~^~~