I am a newbie and I just participated in 2 rated contests that are round #851 and educational round 143 and actually I wasn't even able to solve a single question still my rating increased is that because I am newbie? Nothing to be worried about but I am just curious(Actually I am so happy).

I was giving my first contest on codeforces yesterday but I got runtime error in answer I tried to figure our what was causing this but I didn't get anything can anyone please tell me where is the problem. Your help is much appreciated. Here is the link to the question that is "One and Two" -> https://mirror.codeforces.com/contest/1788/problem/A.