HDU5487 Difference of Languages(BFS)】的更多相关文章

题意:给你两个自动机,求出最短的(如果有相同最短的则求出字典序最小的)能被其中一个自动机接收而不能被另外一个自动机接收的字符串. 一看是自动机以为是神题,后来比赛最后才有思路. 两个自动机的状态都是小于1000的,所以可以建一个图,每个结点(u,v)表示当前处于自动机1的状态u和自动机2的状态v,然后相应的这些状态接收[a-z]的字符就会转移到下一个状态.然后从原点(0,0)开始广搜,搜到的第一个accpet[u]!=accept[v]的即是所求的状态.(处理的时候要给每个自动机加一个状态,用来…
HDU 5487 Difference of Languages 这题从昨天下午2点开始做,到现在才AC了.感觉就是好多题都能想出来,就是写完后debug很长时间,才能AC,是不熟练的原因吗?但愿孰能生巧吧. BFS转移的是两个DFA的状态,用typedef pair<int,int> pi;map<pi,pi> pres;      两步储存前后状态的链接. 附上一组测坑数据: /*4324 3 130 1 a1 2 e2 3 w6 3 150 1 a1 3 e3 5 h*/ #…
Difference of Languages Time Limit: 1000ms Memory Limit: 32768KB This problem will be judged on HDU. Original ID: 548764-bit integer IO format: %I64d      Java class name: Main A regular language can be represented as a deterministic finite automaton…
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这道题目甚长, 代码也是甚长, 但是思路却不是太难.然而有好多代码实现的细节, 确是十分的巧妙. 对代码阅读能力, 代码理解能力, 代码实现能力, 代码实现技巧, DFS方法都大有裨益, 敬请有兴趣者耐心细读.(也许由于博主太弱, 才有此等感觉). 题目: UVa 1103 In order to understand early civilizations, archaeologists often study texts written in  ancient languages. One…
XML, or Extensible Markup Language, is a subset  of the more complex SGML (Standard Generalized Markup Language). XML makes use  of syntax tags that helps to identify the various data  types in a file. XML is referred to as a metalanguage that descri…
There were hundreds of or thousands of programming languages created since the invention of computer. All these languages have the same target which is to make the computer do what we want it do. So we may find that many languages have the same funct…
To master any programming languages, you need to definitely solve/practice the below-listed problems. These problems range from easy to advanced difficulty level. I have collected these questions from various websites. For solutions refer this - http…
D. Vladik and Favorite Game time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output This is an interactive problem. Vladik has favorite game, in which he plays all his free time. Game field could…