How rating is calculated?

I have solved one question in December long challenge successfully then also my rating has decreased. Similar case happen in November long challenge ! I am not able to figure out because of what my rating is decreasing?

here is how rating in codechef is calculated
and your rating also depends on how others have done in the contest .then it is being compared . go and check that link. don’t get demotivated due to fall in your rating be motivated always and try to learn new things from every challenege .

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