随笔分类 - 数学-反演
摘要:范德蒙德卷积 \sum_{i = 0}^{k} \tbinom{n}{i} \tbinom{m}{k i} = \tbinom{n + m}{k} 斯特林数 "link" $\tbinom{n}{m} \tbinom{m}{k} = \tbinom{n}{k} \tbinom{n k}{m k}
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摘要:比赛链接 "cf" A 最后一位判定 C 所有方案 全是红边的方案 并查集维护 cpp include include include include include include include include include using namespace std; typedef long
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