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The AC automata algorithm combined with even group Trie is a relatively fast word matching algorithm, which is commonly used in Word segmentation, and this paper intends to explain the implementation principle of this matching algorithm with pseudo-code combined with examples.Build steps:Building a 1.Trie TreeFirst, intuitively feel the trie tree:Trie Tree formed after inserting a pattern string ball, bat, doll, dork, dorm, do, send, senseThe trie tre

"bzoj1030": [JSOI2007] Text generatorFirst, the problem of matching any number of questions into the total number-no number of matchesFirst, the AC automata are constructed, and then the letters of each bit are enumerated, and the position on the automataF[I][J] is the position of the I bit at J and does not match the number of any one stringThen 26^m-sum (F[m][j]) is the answer.There is a p->fail to the root of the path as long as there is a point is

Problem Description:V7 wx3520h with Wa4320i-acn-si to do local forwarding, Portal configuration in the service template, that is, the use of local forwarding centralized authentication of the portal program;Customer use, found under the AP terminal to HTTP page redirection is normal, HTTPS page redirection exception;Cause Analysis:V7 can now support HTTPS page redirection, default no additional configuration, when centralized forwarding, the function is normal; Local forwarding is slightly diffe

Implement StrStr ()Total accepted:49294 Total submissions:223057my submissions QuestionSolutionImplement strStr ().Returns the index of the first occurrence of needle in haystack, or-1 if needle are not part of haystack.Update (2014-11-02):The signature of the function had been updated to return the index instead of the pointer. If you still see your function signature returns a char * or String , please click on the reload button to reset your code Definition.Hide TagsPointers StringHas you met

Unblocked Works continuedTime limit:3000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 31655 Accepted Submission (s): 11564Problem description a province since the implementation of many years of smooth engineering plans, finally built a lot of roads. But the road is not good, every time from one town to another town, there are many ways to choose, and some programmes are more than others to walk the distance is much shorter. This makes pedestrians very tr

1. Alternating current and DC power The current of the size and direction of periodic changes over time is called alternating current, referred to as AC power (AC). A variety of battery-supplied currents flow in only one direction, called direct current (DC). 2. Principle of single-phase alternating current generator 3. Three-phase electric generator principle The three-phase electrical principl

Title Link: http://www.lydsy.com/JudgeOnline/problem.php?id=1212 Build a given word into an AC automaton and then run the article on it. F[i] Indicates if I can match to the I character, when the I character on the AC automaton went to the X node, if x is a danger node then always jump x's fail pointer, if there is danger node on the path, F[i]|=f[i-w[x]] (where w[x] Indicates: If x is the terminating node

I will give you a bunch of virus strings and some other websites and ask if each website contains a virus string. If so, which virus strings are included, there are also several websites that contain virus strings. Ah, the first question of the AC automatic machine is a simple template question. In a few days, I will summarize the question of the AC automatic machine. The idea is simple. You can construct

NYOJ 1085 words (AC automatic machine template), nyoj1085Several words time limit: 1000 MS | memory limit: 65535 KB difficulty: 4 Description In order to successfully pass the CET-4 and CET-6, everyone now gets up early every morning to read English. LYH thought that he could pass level 6 in the June test, but did not expect that he did not pass the test after the score was obtained. So he had to spend more time learning English. To pass

POJ 3691 DNA repair AC DP, poj1_1 Give a virus string and a string, and ask how many modifications should be made so that the original string does not contain the virus string. Idea: AC automation + DP, a bare question. First, create an AC automatic mechanism based on the virus string (Trie diagram is also acceptable), and then set the status: f [I] [j] indicate

Links: http://poj.org/problem?id=2778Test instructions: Given no more than 10 strings, each string of not more than 10 of the disaster gene; Q. How many genes do not contain a catastrophic gene in the length of a given length of not more than 2e9?DNA: Contains only ' A ', ' T ', ' C ', ' G ' four characters;Idea: This is not very nude AC automata. There is no obvious text string matching process, but we can pass the trie of the disaster gene, we need

Test instructions: Given n a pattern string that cannot occur, given a length of M, the number of valid strings of length m is required.Idea: Using AC automata, using the nodes on AC automata to do matrix multiplication.1#include 2#include 3#include 4#include 5#include string>6#include 7#include 8 #defineMOD 1000009 Chars[2005];Ten intChCharx) { One if(x=='A')return 0; A if(x=='C')return 1; - if

The shortest sequence that contains all n DNA fragments and does not contain any one of the virus fragments.It is easy to build an AC automaton with all the DNA fragments and virus fragments, and when the fail is constructed, the node suffix is a DNA or a virus, then dp[s][u] indicates that the set containing the DNA fragment is s and the suffix state is the shortest sequence length of the first U node of the automaton, Then follow the

Problem Link: HDU2037 this summer holiday does not AC.Typical greedy algorithm problems, respectively, in C language and C + + language programming program.A number of TV shows, naturally, should be viewed chronologically. In order to see more programs, you need to finish a program as soon as possible to see another program, more short show to see more programs.C Language Program and C + + language program differences, only in terms of ordering, called the function and parameters are different.A

][0][0] =1; for(inti =0; I for(intj =0; J for(intK =0; K for(intSTA =0; STA 4; + + STA) {if(Dp[i][j][k][sta]) {intNode1 = next[k][0];intNode2 = next[k][1]; Dp[i][j +1][node1][sta | end[node1]] + = Dp[i][j][k][sta]; Dp[i +1][j][node2][sta | end[node2]] + = Dp[i][j][k][sta]; Dp[i][j +1][node1][sta | end[node1]]%= mod; Dp[i +1][j][node2][sta | end[node2]]%= mod; } } } } }intAns =0; for(inti =0; i 3]; Ans%= MoD; }printf("%d\n", ans); }}

POJ 3691 DNA repair AC DP Give a virus string and a string, and ask how many modifications should be made so that the original string does not contain the virus string. Idea: AC automation + DP, a bare question. First, create an AC automatic mechanism based on the virus string (Trie diagram is also acceptable), and then set the status: f [I] [j] indicates that t

One: ConceptFirst of all, a brief introduction of AC own active machine: Aho-corasick automation, the algorithm was produced in 1975 in Bell Labs, is one of the famous multimode matching algorithms. A common example is to give n words, and then give an article (length is m), let you find out how many words have appeared in the article.To understand AC own active machine. First have to have the basic knowled

"Test instructions" Ali like to collect all kinds of strange things, he recently Amoy to an old-fashioned typewriter. There are only 28 keys on the typewriter, with 26 lowercase English letters and ' B ' and ' P ' two letters printed respectively.The ALI study found that the typewriter worked like this:L Enter lowercase letters and the letter is added to a groove in the typewriter (the letter is added to the end of the groove).L PRESS the ' B ' button and the last letter in the typewriter groove

of the Rose Finch, the north of the Xuanwu, to the Cardinal four to the opposite. Now, archaeologists are confronted with a difficult problem. for each piece of text, what is the maximum match length of the prefix on the parent string? Input Format:The first line has two integers, N and M, which represent the length of the parent string and the number of text segments. The second line is a string of length n, and all characters satisfy one of the E,S,W and N. after M lines, each line has a stri

connected to the LAN is larger, the less bandwidth resources available for each workstation, the slower the surfing speed, as the prices of Switch Equipment and router equipment keep falling, Medium-and Small-scale LAN networks begin to abandon network devices such as hubs. In recent years, many organizations have begun to use vswitches as network devices to connect to each workstation, and use a star topology to build a LAN network. On the surface,