dear coordinators, come to your senses and do not fill the Division 2 tasks with pure mathematics and implementing stuff, there are a bunch of other things to learn... and please, do not coordinate a round in which C2 has less solves than D Just for god's sake, contests are not implementation and number theory trainings
Do AtCoder instead, but yes I agree. Math problems are easy to set but surely nobody needs this much math irl when working for tech companies.
The easiest way to avoid unbalanced contests is mixing problems from different authors in the same contest (like in other platforms), but it makes contest organization messier.
About today's C2, we knew that it's harder than D, and this is the reason why C is worth more points than D.
You are still under the influence of the round. Calm down, breathe, hit the gym or go for a run. Tomorrow your mind will be clear and you will be able to practice and work on your weaknesses.