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**Replay** 赛时whx单排，迅速通过E、C、H三题签到。随后稳健跟榜，通过I、B、G. A题尝试提交多次，遗憾未过。 **Problems** I: 按照区间长度从小到大dp。 B: 将两种暴力结合，根号分治。 C: 根号以上的质数至多1个，按照大质数分组，小质数状压跑背包。 A: 构造，注意提交前清空调试信息 **Dirt** E(-2) 判无解问题. H(-2) 未考虑重复. I(-1) 左端点判断少条件. A(-5) 忘记删调试输出.