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2023年8月3日,我参加了 [TopCoder SRM 848](https://community.topcoder.com/stat?c=round_overview&rd=19668),结果 Div I 第一题就没做出来,零分完赛。赛后看了[其他选手的代码](https://community.topcoder.com/stat?c=problem_solution&cr=90029704&rd=19668&pm=18085),意识到这其实是一个比较基础的组合数学问题。