Decrease in Rank

I solved a problem (MATPAN) in August Lunchtime 2017 and got 100pts. But after the challenge is over my codechef rating came down by 5 pts. What is the reason?

Hey @dr_strange11,

That means that you have not performed well enough as expected from you (Through algorithm). That’s why your rating decrease.

Happy coding, and high rating in the future contest.

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