aka.Sohieb & Ibrahim_Mohamed are two accounts belongs to one person

Our cheater today is Sohieb Mohamed

you can see the rank of each account and notice the submission time for every problem

deader: http://codeforces.com/contest/550/standings/participant/4821774#p4821774

Sohieb_Mohamed: http://codeforces.com/contest/550/standings/participant/4832374#p4832374

and here are the submitted codes for both accounts

Ibrahim_Mohamed 'D': here

aka.Sohieb 'D': here

Ibrahim_Mohamed 'C': here

aka.Sohieb 'C': here

Ibrahim_Mohamed 'B': here

aka.Sohieb 'B': here

now I don't know how the cheating algorithm looks like but apparently it's not good enough specially in the two codes of problem 'D' which seems very identical.