Hello.

I am wondering why Codeforces uses separated problems for subtask instead of separated test cases. Polygon is already supporting to have multiple testsets to act similar as subtasks, also Checker from testlib.h supports _pc (Partially Correct), which is intended to give partial score. So I think there is no reason to make separated problems such like R542 Div1 A1. It will be better if Codeforces just give participants partial score instead. Anyone have opinion about it?

Thanks for reading this.