Well, as you see, I got a lot of rating and become blue after Codeforces Round 938.\(^_^)/ But... Is this really reasonable?

I got rank 1500+ and a lot of coders near or below my rating at basically the same rankings gained much less than me. How did it happen? It seems like my problem B was never hacked for my qsort(I finally solved ACDEF, B was hacked). Or are there any "Newbie protection" or that sort of things for me?:)