/in/foo.cc: In function 'int main()':
/in/foo.cc:25:8: warning: iteration 9999 invokes undefined behavior [-Waggressive-loop-optimizations]
    f[i]=200;
    ~~~~^~~~
/in/foo.cc:24:12: note: within this loop
   for(i=1;i<=10000;i++)
           ~^~~~~~~