/in/foo.cc: In function 'void xxs()':
/in/foo.cc:43:13: warning: iteration 200008 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(!note[i])
       ~~~~~~^
/in/foo.cc:41:15: note: within this loop
  for(int i=2;i<=maxm;i++)
              ~^~~~~~