First of all, the mathematical problems are very big, and now basically all mathematical problems except the analog graph theory dp data structure.
Mathematical questions: I am not familiar with the recursive formula, the rules, and the tricks, which led to the Saturday game getting stuck in one, but not in three. Four lanes in Sunday scrims won't.
Graph theory: partial order, what the hell is a hashmap orz
dp, data structure, dichotomy: I don't see which one to use QAQ
Do the math this week. Review dfs. Continue to learn dp, data structure graph theory.