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author
Shuhao Zhang
<594422141@qq.com>
Wed, 6 Mar 2019 11:51:53 +0000
(19:51 +0800)
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GitHub
<noreply@github.com>
Wed, 6 Mar 2019 11:51:53 +0000
(19:51 +0800)
docs/math/du-sieves.md
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$$
## 【例 1】模板
??? note " [P4213【模板】杜教筛(Sum)](https://www.luogu.org/problemnew/show/P4213)"
-
-题目大意:求 $S_1(n)= \sum_{i=1}^n \mu(i)$ 和 $S_2(n)= \sum_{i=1}^n \varphi(i)$ 的值, $n\le 2^{31} -1$ 。
+ 题目大意:求 $S_1(n)= \sum_{i=1}^n \mu(i)$ 和 $S_2(n)= \sum_{i=1}^n \varphi(i)$ 的值, $n\le 2^{31} -1$ 。
### 求解 $\mu$ 前缀和