QOJ.ac

QOJ

حد الوقت: 3.0 s حد الذاكرة: 1024 MB مجموع النقاط: 100 قابلة للهجوم ✓

#9309. 图

الإحصائيات

我们称一个具有 $n$ 个顶点的无向图是“好的”,如果对于所有 $1 \le u, v \le n$,在 $u$ 和 $v$ 之间至少存在一条路径 $u = x_1, x_2, \dots, x_m = v$,使得 $\gcd(u, v) = \gcd(x_1, x_2, \dots, x_m)$。

我们称一个具有 $n$ 个顶点的无向图是“完美的”,如果它是“好的”且该图的边数最少。也就是说,任何其他具有 $n$ 个顶点的“好的”图的边数都不会少于该图。

你需要计算具有 $n$ 个顶点的“完美的”图的数量。

由于答案可能非常大,你只需要输出其对 $998\,244\,353$ 取模的结果。

输入格式

输入仅包含一个整数 $n$ ($2 \le n \le 10^{11}$),表示你需要计算的“完美的”图的顶点数。

输出格式

输出仅包含一个整数,表示答案对 $998\,244\,353$ 取模的结果。

样例

样例输入 1

4

样例输出 1

8

Discussions

About Discussions

The discussion section is only for posting: General Discussions (problem-solving strategies, alternative approaches), and Off-topic conversations.

This is NOT for reporting issues! If you want to report bugs or errors, please use the Issues section below.

Open Discussions 0
No discussions in this category.

Issues

About Issues

If you find any issues with the problem (statement, scoring, time/memory limits, test cases, etc.), you may submit an issue here. A problem moderator will review your issue.

Guidelines:

  1. This is not a place to publish discussions, editorials, or requests to debug your code. Issues are only visible to you and problem moderators.
  2. Do not submit duplicated issues.
  3. Issues must be filed in English or Chinese only.
Active Issues 0
No issues in this category.
Closed/Resolved Issues 0
No issues in this category.