/in/foo.cc: In function 'int main()':
/in/foo.cc:12:9: warning: iteration 2147482 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(s[i]) cout<<a[i]<<" ";
      ~~~^
/in/foo.cc:11:15: note: within this loop
  for(int i=1;i<=2147483;i++){
              ~^~~~~~~~~