POJ 2579 Fiber Network(状态压缩+Floyd)

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POJ 2579 Fiber Network(状态压缩+Floyd)

Fiber Network Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 3328 Accepted: 1532 Description Several startup companies have decided to build a better Internet, called the "FiberNet". They have already installed many nodes that ac…

Fiber Network ZOJ 1967(Floyd+二进制状态压缩)

Description Several startup companies have decided to build a better Internet, called the "FiberNet". They have already installed many nodes that act as routers all around the world. Unfortunately, they started to quarrel about the connecting li…

POJ 2570 Fiber Network

Description Several startup companies have decided to build a better Internet, called the "FiberNet". They have already installed many nodes that act as routers all around the world. Unfortunately, they started to quarrel about the connecting li…

POJ 3254. Corn Fields 状态压缩DP (入门级)

Corn Fields Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 9806 Accepted: 5185 Description Farmer John has purchased a lush new rectangular pasture composed of M by N (1 ≤ M ≤ 12; 1 ≤ N ≤ 12) square parcels. He wants to grow some yumm…

POJ 3691 (AC自动机+状态压缩DP)

题目链接: http://poj.org/problem?id=3691 题目大意:给定N个致病DNA片段以及一个最终DNA片段.问最终DNA片段最少修改多少个字符,使得不包含任一致病DNA. 解题思路: 首先说一下AC自动机在本题中的作用. ①字典树部分:负责判断当前0~i个字符组成的串是否包含致病DNA,这部分靠字典树上的cnt标记完成. ②匹配部分:主要依赖于匹配和失配转移关系的计算,这部分非常重要,用来构建不同字符间状态压缩的转移关系(代替反人类的位运算). 这也是必须使用AC自动机而…

[POJ 2923] Relocation (动态规划状态压缩)

题目链接:http://poj.org/problem?id=2923 题目的大概意思是,有两辆车a和b,a车的最大承重为A,b车的最大承重为B.有n个家具需要从一个地方搬运到另一个地方,两辆车同时开,问最少需要搬运几次? 我先想的是我由A车开始搬,搬运能装的最大的家具总重,然后状态压缩记录下搬运了哪些,然后再由B车搬运,状态压缩记录搬运了哪些.以此类推,直到状态满了. 以上方法TLE 然后,实在想不出来了,看了题解:http://blog.csdn.net/woshi250hua/articl…