Hello,

I have a concern about the rating. In my last contest (Round #657, only Div 2), I got about 1200th rank out of about 8600 contestants. That's roughly top 15%. This boosted my rating by +11 points. I am guessing that indicates the performance of a 1900 rated contestant. However, the contest before (Round #652, only Div 2), I got ranked again 1200th, but this time about 14500 contestants participated. That put me on top 10 percent. However, that time I actually lost -4 points, which this time is about the performance of a 1840 one.

My question is, even though I did quite better on my 2nd previous contest, which did I get 15 points less? Is it because of rating inflation? Or maybe because the last contest was an outlier (much less participation than the COVID era amount of users)?

Hello, I have a question about taking mod of 2 separate numbers. Specifically, let's say that we want to calculate a value on $$$mod = 998244353$$$ as usual.

Additionally, we precalculate the powers of 2 based on that mod (say up to $$$2^{1000}$$$). And let's say that we have a number $$$k$$$ based on $$$mod$$$.

My question is, is it possible to calculate $$$k$$$ % $$$2^{1000} \equiv mod$$$ in our modular base? If so, how?

Thanks in advance!