/in/foo.cc: In function 'int main()':
/in/foo.cc:14:13: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
   if (n>=a[i]||b>=a[i])
          ~~~^
/in/foo.cc:12:13: note: within this loop
  for (i=1; i<=10; i++)
            ~^~~~