/in/foo.c: In function 'main':
/in/foo.c:13:12: warning: iteration 4 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(a[i]>a[i+1])
           ~^~~~~
/in/foo.c:11:2: note: within this loop
  for(i=0;i<n;i++)
  ^~~