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optim
EM不详解
Codeforces Round 782 (Div. 2)
Codeforces Round 778 (Div. 1 + Div. 2, based on Technocup 2022 Final Round)
Codeforces Round 777 (Div. 2)
Codeforces Round 779 (Div. 2)
上海市大学生程序设计竞赛 - EOJ Monthly 2021.12
EOJ Monthly 2021.10
高数