As in the title, I came across this option when messing around with polygon and can not find any document.
This option is accessible from General info => Advanced => Scorer file.
It seems to be able to control the score for submission by printing a floating number.
Does writing custom scorer files allow us to make partial-scoring problem subtask-min-able? Or scoring function based on submission time like Div.1,2 rounds?
This is an API to compute the final score based on verdicts on all tests. This was used for several problems in the IOI archive, but it's kinda work-in-progress, and not really in priority. As I understand it's hidden, as it's quite probable to be incompatibly broken later. But if you are ok with it, you can check https://github.com/MikeMirzayanov/testlib/tree/scorer to deduce the current API.
Thanks for your response :)