Codeforces Round 100
E
New Year Garland
Codeforces
2600
原题
← DF →
翻译中…

As Gerald, Alexander, Sergey and Gennady are already busy with the usual New Year chores, Edward hastily decorates the New Year Tree. And any decent New Year Tree must be decorated with a good garland. Edward has lamps of $*m*$ colors and he wants to make a garland from them. That garland should represent a sequence whose length equals $*L*$. Edward's tree is $*n*$ layers high and Edward plans to hang the garland so as to decorate the first layer with the first $*l*_{1}$ lamps, the second layer — with the next $*l*_{2}$ lamps and so on. The last $*n*$-th layer should be decorated with the last $*l*_{*n*}$ lamps, image

翻译中…

Edward adores all sorts of math puzzles, so he suddenly wondered: how many different ways to assemble the garland are there given that the both following two conditions are met:

翻译中…
  1. Any two lamps that follow consecutively in the same layer should have different colors.
  2. The sets of used colors in every two neighbouring layers must be different. We consider unordered sets (not multisets), where every color occurs no more than once. So the number of lamps of particular color does not matter.
翻译中…

Help Edward find the answer to this nagging problem or else he won't manage to decorate the Tree by New Year. You may consider that Edward has an unlimited number of lamps of each of $*m*$ colors and it is not obligatory to use all $*m*$ colors. The garlands are considered different if they differ in at least one position when represented as sequences. Calculate the answer modulo $*p*$.

翻译中…

Input

翻译中…

The first line contains three integers $*n*$, $*m*$ and $*p*$ ($1 ≤ *n*, *m* ≤ 10^{6}$, $2 ≤ *p* ≤ 10^{9}$) which are the number of the tree's layers, the number of the lamps' colors and module correspondingly. The next line contains $*n*$ integers $*l*_{*i*}$ ($1 ≤ *l*_{*i*} ≤ 5000$, image).

翻译中…

Output

翻译中…

Print the only integer — the number of garlands modulo $*p*$.

翻译中…

Note

翻译中…

In the first sample the following variants are possible: 121|1|12, 121|1|21, 121|2|12, 121|2|21, 212|1|12, 212|1|21, 212|2|12, 212|2|21. In the second sample the following variants are possible: 12|13, 12|23, 12|31, 12|32 and so on.

翻译中…

Figure for the first sample: image

翻译中…

样例

Input #1
3 2 1000
3 1 2
Output #1
8
InputCopy OutputCopy
Input #2
2 3 1000
2 2
Output #2
24
InputCopy OutputCopy
Input #3
1 1 1000
5
Output #3
0
InputCopy OutputCopy
题目信息
题号
140E
时间限制
5 s
内存限制
256 MB
标签
组合数学
动态规划

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。