Codechef rating

My rating on 14/01/2019 was 1381 and on 15/01/2019 it dropped by 69 points to 1312?
how is this possible? I believe that I have not violated codechef’s code of conduct.

Its how the rating system works. If you participate in a contest and solve no problems correctly than your rating will decrease. Same has happened to you as you didn’t submit any solution correctly in January Challenge.
Refer the below url for more.

Ratings fall for reasons other than violation of code of conduct as well…

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so now, how do I increase my rating? Can i improve my rating by solving practice problems?

nope you cannot your rating will only increase if you solve problems in rated contests like long,cook-off,lunchtime

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