ps：kmp算法强大，多练！！嘻嘻···

Oulipo

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2082    Accepted Submission(s): 829


 

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

# include <stdio.h>
# include <string.h>
char mon[1000005];
char son[10005];
int next[10005];
int len1,len2;
void get_next()
{
     int i,j;
     i=0,j=-1;
     next[0]=-1;
     while(i<len2)
     {
         if(j==-1||son[i]==son[j])
         {
             i++;
             j++;
             next[i]=j;
         }
         else
             j=next[j];
     }
}
void kmp()
{
     int i,j,num=0;
     i=0,j=0;
     while(i<len1&&j<len2)
     {
         if(j==-1||mon[i]==son[j])
         {
             i++;
             j++;
             if(j==len2)
             {
                  num++;
                  j=next[j];     
             }
         }
         else
              j=next[j];
     }
     printf("%d\n",num);
}
int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%s%s",&son,&mon);
        len1=strlen(mon);
        len2=strlen(son);
        get_next();
        kmp();
    }
}