Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 159  Solved: 110[Submit][Status][Discuss] Description Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie may press the buttons in any ord…

BZOJ_2580_[Usaco2012 Jan]Video Game_AC自动机+DP Description Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie may press the buttons in any order she likes; however, there are only N disti…

2580: [Usaco2012 Jan]Video Game Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 142  Solved: 96[Submit][Status][Discuss] Description Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie m…

Description Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie may press the buttons in any order she likes; however, there are only N distinct combos possible (1 <= N <= 20). Combo i…

Description Bessie is playing a video game! In the game, the three letters 'A', 'B', and 'C' are the only valid buttons. Bessie may press the buttons in any order she likes; however, there are only N distinct combos possible (1 <= N <= 20). Combo i…

正解:AC自动机+dp 解题报告: 传送门! 算是个比较套路的AC自动机+dp趴,,, 显然就普普通通地设状态,普普通通地转移,大概就f[i][j]:长度为i匹配到j 唯一注意的是,要加上所有子串的贡献,就在结构体中新加一个变量d表示在跟到这个节点的串以及后缀中完整串的个数 直接在bfs求fail的时候加上fail指针的d就欧克 啊当然只是为了方便描述所以说另开一个d,,,实际实现的话直接把标记结尾的那个值改成int类型搞下就欧克 然后说下细节,,, 其实就一个细节,就赋初值问题,要把除了f[i…

Description 贝西正在打格斗游戏.游戏里只有三个按键,分别是“A”.“B”和“C”.游戏中有 N 种连击 模式,第 i 种连击模式以字符串 Si 表示,只要贝西的按键中出现了这个字符串,就算触发了一次连 击模式.不 同的连击模式是独立计算的,如果几个连击模式同时出现在贝西的按键顺序里,就算有重 叠部分, 也可以同时算作触发了多个模式. 假如有三个连击模式,分别是“AB”,“BA”,“ABC”,而贝西按下了“ABABC”,那么她一共 触发了四次 连击.假设贝西一共可以按 K 次键,那么她…

题面 传送门 思路 首先,有一个非常显然的思路就是dp: 设$dp[i][j]$表示前i个字符,最后一个为j 然后发现这个东西有后效性 改!设$dp[i][j]$代表前i个字符,最后15个的状态为j(压缩一下),转移的是候枚举增加那个字符,然后看从谁可以推过来 然后就TLE了,完全无压力 怎么优化这个算法? 显然,枚举完增加哪个字符以后,可以用AC自动机来实现多模匹配 然后发现:我们把j的定义变成AC自动机上面的点j,这样一个点就代表一种状态,状态之间互相不重复,而且也没有后效性 这样的定义方法…

题目链接 手写一下AC自动机(我可没说我之前不是手写的) Trie上dp,每个点的贡献加上所有是他后缀的串的贡献,也就是这个点到根的fail链的和. #include <cstdio> #include <queue> #include <cstring> #include <algorithm> using namespace std; const int MAXK = 1010; const int MAXN = 1010; struct ACA{ in…

Problem Description Danganronpa is a video game franchise created and developed by Spike Chunsoft, the series' name is compounded from the Japanese words for "bullet" (dangan) and "refutation" (ronpa). Now, Stilwell is playing this gam…