Ever since reaching purple fame on the site, I've been learning some untouched algorithms, not doing well at the bootcamps in China in July and August, always wasting time on some probabilities and expectations, and some not-so-obvious dynamic programming.And it feels like wasting time on topics that others think are classic. I've been struggling with this.
According to the rules of the EC region, we participated in the online selection tournament and got a place by chance. To get good results, I knew I had to train hard.The regional gold medal is a goal that I have set for myself, which may sound unrealistic, but I think I already won the bronze medal last year, and I should set a higher goal this year to motivate myself.

The regional gold medal is a goal that I have set for myself, which may sound unrealistic, but I think I already won the bronze medal last year, and I should set a higher goal this year to motivate myself.

If you want to become a purple name, you need to be able to open a D question of div2 steadily, but it is not very stable for me. I've learned some basic algorithms like the data structure and shortest circuit of the line segment tree and tarjan, but I still don't know where to start with the D and E questions. What should I do?QWQ