$\prod_{Q=1}^n\left(\prod_{d|Q}f_{Q/d}^{\mu(d)}\right)^{\lfloor\frac n{Q}\rfloor\lfloor\frac m{Q}\rfloor}$
最后推出来的柿子,考虑预处理里面的那一堆东西然后分块算,但是不知道为什么错了(
by Ame__ @ 2020-08-10 10:59:16
没有人吗(
by Ame__ @ 2020-08-10 11:04:05
筛$\mu$筛错了,此贴完结
by Ame__ @ 2020-08-10 11:28:30