/in/foo.cc: In function 'void init()':
/in/foo.cc:19:11: warning: iteration 10000000 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(check(a[i]))
      ~~~~~^~~~~~
/in/foo.cc:18:15: note: within this loop
  for(int i=1;i<=NN;i++)
              ~^~~~