/in/foo.cc: In function 'int main()':
/in/foo.cc:12:10: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
    if(a[i]<=n)
       ~~~^
/in/foo.cc:11:15: note: within this loop
  for(int i=1;i<=10;i++)
              ~^~~~