My Solution is:- https://codeforces.com/contest/1806/submission/197909903

His/Her (Whom I donot know at all) Solution is:- https://codeforces.com/contest/1806/submission/197909363

Our Solutions do match almost exactly the same, however neither do I used Ideone or any platform from where I can copy his/her code. I even don't know whom that account belongs to. It seems like a co-incidence since the solution was simple that it matched almost exactly. Now I feel unlucky as my rating updates have been rolled-back. Please anyone, help out here and tell me what to do?