I'm from mainland China, but when I access CF Cloudflare automatically matches to a Cloudflare node in the western US, which makes accessing CF very slow. But in fact, Cloudflare has nodes in most places around the world, I am suggesting CF to change the Cloudflare access nodes in some regions, and preferably choose the closest one, so that the access will be smoother, and the contest process will be smoother as well.

I've noticed in recent tournaments that I'm not very good at solving greedy, DP, math problems, game theory and constructed problems, can you suggest some targeted problems for me? Appreciate it!