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xuanquang1999 actually proposed ~10 problems yet our dear cdkrot denied half of them.
I also proposed 4 and got denied 3 first one as well :-P

Problem B is the last invented problem. I was walking around the computer labs, thinking of some photoshopped Catzilla cat memes, which led to me thinking of enlarging cute kittens, then coming up with this problem.

Ironicly though, my model greedy solution would actually shrink the cats instead.

Anyway, I forgot this picture about longcat:

neko_nyaaaaaaaaaaaaaaaaa and I after I finished writing statements of B:

MofK went haywire after seeing first AC of problem F2 by dreamoon_love_AA. Poor MofK, he wrote a superbly veryheckingfast solution for F2 and was still outmatched. :<