https://codeforces.me/contest/1598/submission/131464090

They knowingly hacked their own code...

I suppose this hack is illegal? Will codeforces detect this automatically or someone has to report this?

Edit

 if(n == 3 && a[0] == 228 && a[1] == 1337 && a[2] == 228){
        cout << "HACKED LOL" << endl;
        return;
 }

for those who doesn't bother reading the submission