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Time Limit: 1.5 s Memory Limit: 1024 MB Total points: 100

#8753. 腊肠披萨

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题目描述

宇宙北大街上新开了一家披萨店。这家披萨店主打使用腊肠的披萨,被顾客亲切地称为“腊肠披萨店”。这种中西合璧的做法听上去很离经叛道,但是品尝过腊肠披萨的顾客都对其称赞有加,吸引了众多食客蜂拥而至。

除了配料极具特色,腊肠披萨店的 Wi-Fi 密码也是它的流量密码。菜单上写着:“本店的 Wi-Fi 密码是

$$ \sum_{i=1}^L \sum_{j=1}^L C^{\left|LCPS\left(s_i, s_j\right)\right|} \bmod{P}, $$

其中 $LCPS\left(s_i, s_j\right)$ 表示 $s_i$ 和 $s_j$ 的最长公共前后缀,即最长的同时是 $s_i$ 前缀和 $s_j$ 后缀的字符串(可能为空,也可能为整个串);每天的 $s_1,\cdots,s_L$ 都不一样,服务员会在点餐后提供用于当天的 Wi-Fi 密码的字符串。每天将会从前 100 名连上 Wi-Fi 的顾客中随机抽取一位免单。”

你计划下周和朋友一起来这家店聚餐,因此你想设计一个算法,快速求出这家店的 Wi-Fi 密码。

输入格式

从标准输入读入数据。

输入的第一行包含三个正整数 $L, C, P$,表示字符串的数量、底数及模数。保证 $1\le L\le 3\times 10^6$,$2\le C < P < 2^{30}$。

接下来 $L$ 行,每行输入一个仅由小写字符构成的字符串 $s_i$。保证 $1\le \left|s_i\right| \le 3\times 10^6$,$\sum_{i=1}^L \left|s_i\right| \le 3\times 10^6$。

输出格式

输出到标准输出。

输出一个非负整数,表示腊肠披萨店的 Wi-Fi 密码。

样例

输入

4 2 378323747
shop
pizza
piazza
pizzala

输出

286

解释

对于 $1\le i,j\le 4, i\ne j$,

  • $LCPS($ pizza $,$ shop $ )=LCPS($ piazza $,$ shop $)=LCPS($ pizzala $,$ shop $)=$ p

  • $LCPS($ pizzala $,$ pizza $)=$ pizza

  • 其余的 $LCPS\left(s_i, s_j\right)=\varepsilon$。

因此对应的 Wi-Fi 密码为

$$ 2^4 + 2^0 + 2^0 + 2^0 + 2^1 + 2^5 + 2^0 + 2^0 + 2^1 + 2^0 + 2^6 + 2^0 + 2^1 + 2^5 + 2^0 + 2^7 = 286. $$

样例

输入

9 99 998244353
asap
peace
piece
pizza
sapiens
dazzling
andromeda
sakurasaku
kokorosaku

输出

161369438

提示

腊肠披萨店在制作披萨时使用了绝密配方。在没有专业人士指导的情况下,请不要轻易模仿。

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