/in/foo.cc: In function 'int main()':
/in/foo.cc:16:7: warning: iteration 9999 invokes undefined behavior [-Waggressive-loop-optimizations]
   16 |   b[i]=a(i);
      |   ~~~~^~~~~
/in/foo.cc:15:15: note: within this loop
   15 |  for(int i=1;i<=10000;i++){
      |              ~^~~~~~~