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I'm probably wrong, but in the Div. 2 contests I've followed, that one had the lowest number of people solving Problem C. X_X

Wowee C !!!

I am the one who solve C problem but with low rating (before the test I was only newbie) , but I can be honestly promise that I didn't use AI . problably is my lucky contest , when I first read the C problem and I quickly find the way to solve , and I consider C is a topological sorting algorithm problem with Lightly concealed;

nc blog.

all nice problem!!! althought I just solve 3,but solve the rest problem with Editorial help me learn a lot!!:)

but there are not enough time for me to solve,most of time wasting in problem D