HDOJ Oulipo （基础KMP）

Oulipo

Time Limit : 3000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other)

Total Submission(s) : 96   Accepted Submission(s) : 61

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


ac代码：

    
    
    
    
#include<stdio.h>  
#include<string.h>  
#include<iostream>  
#include<algorithm>  
#define MAXN 1001000
using namespace std;  
int ans,len1,len2;  
char s1[MAXN];  
char s2[MAXN];  
int nextn[MAXN];  
void makenext()  
{  
    int i,j;  
    j=-1;  
    i=0;  
    nextn[i]=j;  
    while(i<len1) 
    {  
        if(j==-1||s1[i]==s1[j])  
        {  
            i++;  
            j++;  
            nextn[i]=j;  
        }  
        else  
        j=nextn[j];  
    }  
    return;  
}  
void kmp()  
{  
    int i,j;  
    i=j=0;  
    makenext();  
    while(i<len2) 
    {  
        if(j==-1||s2[i]==s1[j])  
        {  
            i++;  
            j++;  
            if(j==len1)  
            ans++;
        }  
        else  
        j=nextn[j];  
    }    
}  
int main()  
{  
    int t;  
    int i;  
    scanf("%d",&t);  
    while(t--)  
    {  
        ans=0;
        scanf("%s%s",s1,s2);  
        len1=strlen(s1);
        len2=strlen(s2);
        kmp();  
        printf("%d\n",ans);  
    }  
    return 0;  
}