/in/foo.cc: In function 'int main()':
/in/foo.cc:14:17: warning: iteration 9999u invokes undefined behavior [-Waggressive-loop-optimizations]
   a[i]=a[i-1]+s4;
                 ^
/in/foo.cc:12:15: note: containing loop
  for(int i=1;i<=10000;++i){
               ^