if some one participates in every contest,and did 1 qstn everytime and on another hand if some didnt participate in every contest but he performed good in last contest(2-3 qstns), who have more rating?
because this same thing is happening with me
Your ratings and stars are completely dependent on your rank in any particular contest. If you are solving one question in every contest and suddenly a contest was so easy that almost everyone(majority) solved 2 problems then your percentile will be lower and ratings will decrease if your performance is lower than your own performance in last attempted contest, but CodeChef computes percentile with a different formula.
As described by @techie_pals: https://www.codechef.com/ratings/
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