Hey!
I was wondering how solve probability in kenkooo is claculated.
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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
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Ask Light
But he is dead.
The following blog may be helpful. I'll also provide translations for the important parts.
We are creating a correctness prediction model using logistic regression, with the internal rating as the independent variable and whether the user answered the question correctly as the dependent variable, treating each pair of (user, problem) during the actual contest as a single data point.
https://pepsin-amylase.hatenablog.com/entry/atcoder-problems-difficulty