#P1876B. Effects of Anti Pimples
Effects of Anti Pimples
Description
Chaneka has an array $[a_1,a_2,\ldots,a_n]$. Initially, all elements are white. Chaneka will choose one or more different indices and colour the elements at those chosen indices black. Then, she will choose all white elements whose indices are multiples of the index of at least one black element and colour those elements green. After that, her score is the maximum value of $a_i$ out of all black and green elements.
There are $2^n-1$ ways for Chaneka to choose the black indices. Find the sum of scores for all possible ways Chaneka can choose the black indices. Since the answer can be very big, print the answer modulo $998\,244\,353$.
谷歌翻译
Chaneka 有一个数组 。最初,所有元素都是白色的。 Chaneka 将选择一个或多个不同的索引,并将这些所选索引处的元素涂成黑色。然后,她将选择索引是至少一个黑色元素索引的倍数的所有白色元素,并将这些元素着色为绿色。之后,她的分数就是所有黑色和绿色元素中 的最大值。
Chaneka 有 种选择黑色索引的方法。求 Chaneka 选择黑色指数的所有可能方式的分数总和。由于答案可能非常大,因此请打印对 取模的答案。
Input
The first line contains a single integer $n$ ($1 \leq n \leq 10^5$) — the size of array $a$.
The second line contains $n$ integers $a_1,a_2,a_3,\ldots,a_n$ ($0\leq a_i\leq10^5$).
Output
An integer representing the sum of scores for all possible ways Chaneka can choose the black indices, modulo $998\,244\,353$.
4
19 14 19 9
1
0
15
90000 9000 99000 900 90900 9900 99900 90 90090 9090 99090 990 90990 9990 99990
265
0
266012571
Note
In the first example, below are the $15$ possible ways to choose the black indices:
- Index $1$ is black. Indices $2$, $3$, and $4$ are green. Maximum value among them is $19$.
- Index $2$ is black. Index $4$ is green. Maximum value among them is $14$.
- Index $3$ is black. Maximum value among them is $19$.
- Index $4$ is black. Maximum value among them is $9$.
- Indices $1$ and $2$ are black. Indices $3$ and $4$ are green. Maximum value among them is $19$.
- Indices $1$ and $3$ are black. Indices $2$ and $4$ are green. Maximum value among them is $19$.
- Indices $1$ and $4$ are black. Indices $2$ and $3$ are green. Maximum value among them is $19$.
- Indices $2$ and $3$ are black. Index $4$ is green. Maximum value among them is $19$.
- Indices $2$ and $4$ are black. Maximum value among them is $14$.
- Indices $3$ and $4$ are black. Maximum value among them is $19$.
- Indices $1$, $2$, and $3$ are black. Index $4$ is green. Maximum value among them is $19$.
- Indices $1$, $2$, and $4$ are black. Index $3$ is green. Maximum value among them is $19$.
- Indices $1$, $3$, and $4$ are black. Index $2$ is green. Maximum value among them is $19$.
- Indices $2$, $3$, and $4$ are black. Maximum value among them is $19$.
- Indices $1$, $2$, $3$, and $4$ are black. Maximum value among them is $19$.
The total sum is $19+14+19+9+19+19+19+19+14+19+19+19+19+19+19 = 265$.
deepl翻译
在第一个示例中,以下是选择黑色索引的可能方法: :
- 索引 为黑色。索引 、 和 为绿色。其中最大值为 。
- 索引 为黑色。索引 为绿色。其中最大值为 。
- 索引 为黑色。其中最大值为 。
- 索引 为黑色。其中最大值为 。
- 索引 和 为黑色。索引 和 为绿色。其中最大值为 。
- 索引 和 为黑色。索引 和 为绿色。其中最大值为 。
- 索引 和 为黑色。索引 和 为绿色。其中最大值为 。
- 索引 和 为黑色。索引 为绿色。其中最大值为 。
- 索引 和 为黑色。其中最大值为 。
- 索引 和 为黑色。其中最大值为 。
- 索引 、 和 为黑色。索引 为绿色。其中最大值为 。
- 索引 、 和 为黑色。索引 为绿色。其中最大值为 。
- 索引 、 和 为黑色。索引 为绿色。其中最大值为 。
- 索引 、 和 为黑色。其中最大值为 。
- 索引 、 、 和 为黑色。其中最大值为 。
总和为 。
相关
在下列比赛中: