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**Replay** 赛时whx单排，迅速通过C、H、A三题签到。 **Problems** B为A题加强版，主要难点在于运用第二类斯特林数快速计算。 I为图论题，将图建出后跑tarjan算法找到边双联通分量找环即可。 D为数据结构题，一个比较少见的套路：将二进制位的取值转化为取模结果落在一或两段区间内。 J为数据结构题，在线段树上二分即可。改题时要注意尽量减少错误提交次数。 **Dirt** A(-1) 实现常数过大。