Hi,
I am surprised to see my name here.First of all i don't know who that guy horizon is and it's really surprising how that guy get my code(
if vdmedragon is correct). I have only share my code 2 or 3 times with one of my friend and that too only for learning purpose
and i know he's not gonna submit either my code or shared with any body living in china 
And also, vdmedragon can you please mention one or two question's where his source code matches mine because if your assumption is correct
then only reason which i think can be hacking. as i'm fully assured that nobody is gonna submit my code here.
Also you can easily see, that user has solved a lot of problems which i havn't solved yet 