QOJ.ac

QOJ

時間限制: 9 s 記憶體限制: 1024 MB 總分: 100

#9493. Path Counting

统计

There is a grid with $n$ rows and $m$ columns, containing a total of $(n+1) \times (m+1)$ grid points. The grid point at row $x$ and column $y$ is denoted by the pair $(x, y)$ (where both rows and columns are 0-indexed).

Initially, the grid has no edges. Now, $(3m+1)n$ directed edges are added sequentially:

  1. For $0 \leq i \leq n-1, 0 \leq j \leq m-1$, add $A_j$ distinct directed edges from $(i, j)$ to $(i+1, j+1)$.
  2. For $0 \leq i \leq n-1, 0 \leq j \leq m$, add $B_i + C_j$ distinct directed edges from $(i, j)$ to $(i+1, j)$.
  3. For $0 \leq i \leq n-1, 1 \leq j \leq m$, add $D_j$ distinct directed edges from $(i, j)$ to $(i+1, j-1)$.

Let $W(x, y)$ denote the number of distinct paths from $(0, 0)$ to $(x, y)$ for integers $x, y$ satisfying $0 \leq x \leq n, 0 \leq y \leq m$. It is easy to prove that the number of paths is finite. You are required to calculate the result of $\sum_{i=0}^{n}\sum_{j=0}^{m}W(i,j)E_{i}F_{j} \bmod p$.

Input

The first line contains four positive integers $c, n, m, p$. The first number represents the subtask ID (specifically, the $c$ in the sample indicates that the constraints satisfied by that sample are the same as those satisfied by the $c$-th subtask). The second and third numbers describe the size of the grid, and the fourth number represents the modulus for the answer.

The second line contains $m$ numbers, where the $i$-th number represents the value of $A_{i-1}$.

The third line contains $n$ numbers, where the $i$-th number represents the value of $B_{i-1}$.

The fourth line contains $m+1$ numbers, where the $i$-th number represents the value of $C_{i-1}$.

The fifth line contains $m$ numbers, where the $i$-th number represents the value of $D_i$.

The sixth line contains $n+1$ numbers, where the $i$-th number represents the value of $E_{i-1}$.

The last line contains $m+1$ numbers, where the $i$-th number represents the value of $F_{i-1}$.

Output

Output a single integer representing the result of $\sum_{i=0}^{n}\sum_{j=0}^{m}W(i,j)E_{i}F_{j} \bmod p$.

Examples

Input 1

1 3 3 998244353
3 1 2 
3 2 2 
3 2 3 1 
1 3 2 
1 2 1 1 
1 1 1 1

Output 1

559

Note 1

$W(0,0)=1,W(1,0)=6,W(1,1)=3,W(2,0)=33,W(2,1)=30,W(2,2)=3,W(3,0)=195,W(3,1)=228,W(3,2)=45,W(3,3)=6$, and $W$ is 0 at all other positions. It is easy to obtain that the answer is 559.

Input 2

1 10 8 998244353
1 1 223419641 557071951 121 92666830 0 49321567 
813349214 695956508 278 0 231694534 0 0 295169358 669776412 451 
139 0 448 354283551 0 293318815 525972283 769691152 124 
389028745 248 122590563 0 99 618248111 561941070 0 
575275733 93848250 0 390 437 0 694493030 90 0 222 0 
142 0 802726546 415295998 155953578 814571694 373754122 127 0

Output 2

460779351

Note 2

After calculation, the answer is 460779351. Note that the result must be taken modulo 998244353.

Examples 3~12

For the provided sample $i$, it satisfies all constraints of subtask $i-2$.

Subtasks

For all data, it is guaranteed that $1 \leq n, m \leq 2\times 10^5, 1 \leq p \leq 10^9$, and $0 \leq A_i, B_i, C_i, D_i, E_i, F_i < p$. It is not guaranteed that $p$ is a prime number, but for data where $p \neq 998244353$, it is guaranteed that $1 \leq n, m \leq 10^5$.

Subtask ID Score $n \leq$ $m \leq$ $A_i$ $B_i$ $C_i$ $D_i$ $E_i$ $F_i$ $p=998244353$
1 3 $5\,000$ $5\,000$ Yes
2 5 $2 \times 10^5$ $2 \times 10^5$ $=0$ $=1$ $=0$
3 8 $=0$
4 8 $=0$
5 5
6 15 $=[i=m]$
7 16 $20\,000$
8 16 $2 \times 10^5$ Has exactly one non-zero position
9 9
10 15 $10^5$ $10^5$ No

Editorials

IDTypeStatusTitlePosted ByLast UpdatedActions
EditorialOpen Official EditorialQingyu- Download

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.