裸的KMP，但是用AC自动机做的。。。。

Oulipo

Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4076 Accepted Submission(s): 1618

Problem Description The French author Georges Perec (1936 1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo group. A quote from the book:

Tout avait Pair normal, mais tout s’affirmait faux. Tout avait Fair normal, d’abord, puis surgissait l’inhumain, l’affolant. Il aurait voulu savoir où s’articulait l’association qui l’unissait au roman : stir son tapis, assaillant à tout instant son imagination, l’intuition d’un tabou, la vision d’un mal obscur, d’un quoi vacant, d’un non-dit : la vision, l’avision d’un oubli commandant tout, où s’abolissait la raison : tout avait l’air normal mais…

Perec would probably have scored high (or rather, low) in the following contest. People are asked to write a perhaps even meaningful text on some subject with as few occurrences of a given “word” as possible. Our task is to provide the jury with a program that counts these occurrences, in order to obtain a ranking of the competitors. These competitors often write very long texts with nonsense meaning; a sequence of 500,000 consecutive 'T's is not unusual. And they never use spaces.

So we want to quickly find out how often a word, i.e., a given string, occurs in a text. More formally: given the alphabet {'A', 'B', 'C', …, 'Z'} and two finite strings over that alphabet, a word W and a text T, count the number of occurrences of W in T. All the consecutive characters of W must exactly match consecutive characters of T. Occurrences may overlap.

Input The first line of the input file contains a single number: the number of test cases to follow. Each test case has the following format:

One line with the word W, a string over {'A', 'B', 'C', …, 'Z'}, with 1 ≤ |W| ≤ 10,000 (here |W| denotes the length of the string W).
One line with the text T, a string over {'A', 'B', 'C', …, 'Z'}, with |W| ≤ |T| ≤ 1,000,000.

Output For every test case in the input file, the output should contain a single number, on a single line: the number of occurrences of the word W in the text T.

Sample Input

3
BAPC
BAPC
AZA
AZAZAZA
VERDI
AVERDXIVYERDIAN

Sample Output

1
3
0

Source 华东区大学生程序设计邀请赛_热身赛

#include 
  
   
#include 
   
     #include 
    
      #include 
     
       #include 
      
        using namespace std; const int maxn=11000; char str[1100000]; int ch[maxn][26],fail[maxn],end[maxn]; int Size,root; int dp[maxn]; int idx(char x) { return x-'A'; } int newnode() { memset(ch[Size],-1,sizeof(ch[Size])); end[Size++]=0; return Size-1; } void ac_init() { Size=0; root=newnode(); } void ac_insert(char str[]) { int len=strlen(str); int now=root; for(int i=0;i
       
         q; fail[root]=root; for(int i=0;i<26;i++) { if(ch[root][i]==-1) ch[root][i]=root; else { fail[ch[root][i]]=root; q.push(ch[root][i]); } } while(!q.empty()) { int now=q.front(); q.pop(); for(int i=0;i<26;i++) { if(ch[now][i]==-1) ch[now][i]=ch[fail[now]][i]; else { fail[ch[now][i]]=ch[fail[now]][i]; q.push(ch[now][i]); } } } } int ac_query(char str[]) { int len=strlen(str); int now=root; int ret=0; memset(dp,-1,sizeof(dp)); for(int i=0;i

HDOJ 1686 Oulipo

Oulipo