Hello, I am Gustavo from Brazil.

I would like some tips to help me improve. Currently, I can solve problems rated around 800 in Div. 4. I can solve problems A, B, and C in Div. 4 contests, but no more than that. In Div. 3, I can sometimes solve problem A, but I don’t know what to study to improve.

I’m in my first year of Computer Science and about to start my second semester. So far, I’ve only had one introductory algorithms course at university. I’ve learned about stacks, queues, sets, multisets, vectors, pairs, and algorithms like sort, upper_bound, and lower_bound. At the beginning of this year, I’ll also learn about trees.

I’ve attached an image of my solved problems. Most of them are rated 800, and I’ve solved 86 of them so far.

What should I do to get better? Any advice is welcome!