P3102 [USACO14FEB]秘密代码Secret Code 题目描述 Farmer John has secret message that he wants to hide from his cows; the message is a string of length at least 2 containing only the characters A..Z. To encrypt his message, FJ applies a sequence of "operations&…

P3102 [USACO14FEB]秘密代码Secret Code 题目描述 Farmer John has secret message that he wants to hide from his cows; the message is a string of length at least 2 containing only the characters A..Z. To encrypt his message, FJ applies a sequence of "operations&…

P3102 [USACO14FEB]秘密代码Secret Code 题目描述 Farmer John has secret message that he wants to hide from his cows; the message is a string of length at least 2 containing only the characters A..Z. To encrypt his message, FJ applies a sequence of "operations&…

农民约翰收到一条的消息,记该消息为长度至少为2,只由大写字母组成的字符串S,他通过一系列操作对S进行加密. 他的操作为,删除S的前面或者后面的若干个字符(但不删光整个S),并将剩下的部分连接到原字符串S的前面或者后面.如对于S='ABC',共有8总可能的操作结果: AABC ABABC BCABC CABC ABCA ABCAB ABCBC ABCC 给出加密后的目标字符串,请计算共有多少种加密的方案. 对于同字符的字符串,加密方案不止一种,比如把AA加密成AAA,共有4种加密方案.将你的答案m…

题目描述 Farmer John has secret message that he wants to hide from his cows; the message is a string of length at least 2 containing only the characters A..Z. To encrypt his message, FJ applies a sequence of "operations" to it, where an operation ap…

洛谷传送门,BZOJ传送门 秘密消息Secret Message Description     贝茜正在领导奶牛们逃跑．为了联络,奶牛们互相发送秘密信息．     信息是二进制的,共有M(1≤M≤50000)条．反间谍能力很强的约翰已经部分拦截了这些信息,知道了第i条二进制信息的前bi(l<bi≤10000)位．他同时知道,奶牛使用N(1≤N≤50000)条密码．但是,他仅仅了解第J条密码的前cj(1≤cj≤10000)位．     对于每条密码J,他想知道有多少截得的信息能够和它匹配．也就是…

题目: 题目链接:[USACO08DEC]秘密消息Secret Message 题意: 给定n条01信息和m条01密码,对于每一条密码A,求所有信息中包含它的信息条数和被它包含的信息条数的和. 分析: 建立一棵trie树,类似于存储26个字母一样存储0和1(每个节点只有两个儿子),然后设包含节点p的信息条数有size[p]条,在节点p结束的信息条数有end[p]条,节点的两个儿子的编号为num[p][0]和num[p][1],然后存储信息. 我们容易知道size[p]存储的实际上是包含了"从根节…

题目描述 Bessie is leading the cows in an attempt to escape! To do this, the cows are sending secret binary messages to each other. Ever the clever counterspy, Farmer John has intercepted the first b_i (1 <= b_i <= 10,000) bits of each of M (1 <= M &…

我对分治的理解:https://www.cnblogs.com/AKMer/p/9728574.html 题目传送门:https://www.luogu.org/problemnew/show/P3612 因为每次操作都会使原串增长一倍,并且后半部分与前半部分极其相似,所以我们可以将其分治. 因为是将原串的最后一个字符放到第一个来,其余字符全部后移一位,所以在后一半的第\(i\)位就是前一半的第\(i-1\)位,如果是后一半的第\(1\)位,那么就是前一半的第\(len\)位.我们每次分治可以将…

P2176 [USACO14FEB]路障Roadblock 题目描述 每天早晨,FJ从家中穿过农场走到牛棚.农场由 N 块农田组成,农田通过 M 条双向道路连接,每条路有一定长度.FJ 的房子在 1 号田,牛棚在 N 号田.没有两块田被多条道路连接,以适当的路径顺序总是能在农场任意一对田间行走.当FZ从一块田走到另一块时,总是以总路长最短的道路顺序来走. FJ 的牛呢,总是不安好心,决定干扰他每天早晨的计划.它们在 M 条路的某一条上安放一叠稻草堆,使这条路的长度加倍.牛希望选择一条路干扰使得F…