摘要: 简单 阅读全文
posted @ 2025-08-14 19:38 hhhqx 阅读(3) 评论(0) 推荐(0)
摘要: for (int s = m; s; s = (s - 1) & m); s = (s - 1) & m 本质是消掉最低的一,并把更后面的 0 都召唤。 阅读全文
posted @ 2025-08-14 14:23 hhhqx 阅读(7) 评论(0) 推荐(0)
摘要: https://www.cnblogs.com/huangqixuan/articles/17577342.html#二项式反演 练习题:https://www.luogu.com/article/83ub0lvq 二项式反演:\(g_n = \sum\limits_{i=0}^{n}{\dbino 阅读全文
posted @ 2025-08-14 11:11 hhhqx 阅读(5) 评论(0) 推荐(0)