I think it is better to have harder B and C in div2 contests.There are div3 and div4 contests for the people who think that div2 is hard.

i was trying to solve old virtual contests, and i don't know if i was just terrible but THOSE div2 B + C problems were hard as fuck. maybe it's because i first trained with those, and THEN i got better, but i don't think so since i solved backwards and the more recent contests (like 600+) I could usually solve A, B, and 50% of the Cs, but the 580+ contests were like wtf i could only solve A. Again, this is only my experience, i'm bad so lol.