@[Felix_Xie](/user/491380)
<https://www.luogu.com.cn/problem/P5325>
by wangjunji @ 2021-09-21 12:11:46
@[王俊吉](/user/378773) Orz,我只能求求phi什么的
by Felix_Xie @ 2021-09-21 12:19:52
@[Felix_Xie](/user/491380) 这没必要找题目吧
by Chancylaser @ 2021-09-21 12:22:10
@[Chase_future](/user/241817) 彳亍,我只是觉得如果能提交更好一些。
by Felix_Xie @ 2021-09-21 12:22:48
@[王俊吉](/user/378773) 你管这叫线性筛?
by Spasmodic @ 2021-09-21 12:48:27
@[Felix_Xie](/user/491380) 去写一份筛 $\tau$ 和 $\sigma$ 的,然后去和 pj 阅读对拍
by Spasmodic @ 2021-09-21 12:49:11
@[happyChristmas](/user/121027) 哪年的
by Felix_Xie @ 2021-09-21 12:57:42
@[happyChristmas](/user/121027) σ是求因子之和,τ是什么。这种居然也是积极,wssb
by Felix_Xie @ 2021-09-21 13:00:11
@[王俊吉](/user/378773) 你管这叫线性筛?
by Echidna @ 2021-09-21 13:21:13
@[Felix_Xie](/user/491380) 今年的,想不到吧
$\tau$ 是约数个数
by Spasmodic @ 2021-09-21 13:34:23